diff --git a/docs/api/rest-api.md b/docs/api/rest-api.md
index f8998e1d..1d967c5a 100644
--- a/docs/api/rest-api.md
+++ b/docs/api/rest-api.md
@@ -661,17 +661,18 @@ additive-compatible and gains two fields:
 A client that is installed but not yet content-checked reads as
 `exists=true, connected=false, access_state="unknown"`. Resolving `connected`
 requires an explicit per-client read (the per-client status route below,
-connect/disconnect, or the CLI `mcpproxy connect` command), which is the only
-place a privacy prompt may legitimately appear.
+connect/disconnect, or the CLI `mcpproxy connect` command), which is where a
+privacy prompt may legitimately appear.
 
 #### GET /api/v1/connect/{client}
 
 On-demand single-client status. Reads the one client's config **at request
 time** and returns a full `ClientStatus` with `access_state` resolved to
 `accessible | absent | malformed | denied` and `connected` set accordingly.
-This is the sole Connect endpoint that opens a client config file, so on macOS
-it is the only place an App-Data privacy prompt may legitimately appear (scoped
-to this user action). Unknown client → `404`. A denial is reported **in-band**
+This — like the other per-client routes below (preview, connect/disconnect,
+undo) — opens the client's config file at request time, so on macOS an App-Data
+privacy prompt may legitimately appear here (scoped to this user action), never
+from the overall listing. Unknown client → `404`. A denial is reported **in-band**
 (`200` with `access_state="denied"` + `remediation`), not as an HTTP error.
 
 ```bash
@@ -684,6 +685,63 @@ Connect/disconnect are unchanged except that a permission-denied config access
 now returns **`403 Forbidden`** whose error body carries the remediation text
 (distinct from a generic `400` or a `404` not-found).
 
+Every connect/disconnect that modifies an **existing** config file first writes
+a timestamped backup next to it (`<config>.bak.<YYYYMMDD-HHMMSS>`, same
+directory and file mode) and returns its path as `backup_path` in the result.
+When two operations land in the same second, a numeric suffix keeps every
+backup distinct (`<config>.bak.<YYYYMMDD-HHMMSS>-1`, `-2`, …) — a backup is
+never overwritten. Backups accumulate one per operation and are **never
+deleted automatically**; there is no retention bound, so an undo (below) can
+always find its backup.
+
+#### GET /api/v1/connect/{client}/preview
+
+Returns the exact change a subsequent connect would make — target config path,
+format (`json`/`toml`), server key, entry name, and the exact entry contents —
+**without** modifying the file or creating a backup (Spec 078 US1). An embedded
+API key is masked in the payload (`contains_api_key` flags that a credential is
+written); `entry_exists` distinguishes a create from an overwrite of a
+same-named entry. Reads the config on demand to classify create-vs-overwrite,
+so on macOS this may raise an App-Data prompt; a denial returns `403` +
+remediation. Optional `?server_name=` mirrors the name a subsequent connect
+would use.
+
+#### POST /api/v1/connect/{client}/undo
+
+One-click undo of the immediately-preceding connect (Spec 078 US3). Body:
+
+```json
+{ "server_name": "mcpproxy", "backup_name": "<basename of backup_path from the connect result>" }
+```
+
+`backup_name` is the **bare filename** of the backup the connect returned in
+`backup_path` — a name, never a path. The server resolves the full path itself
+inside that client's own config directory (derived from the client registry, not
+the request), so a caller-supplied value can never contribute a directory
+component and cannot escape the config dir (defense against path injection).
+
+- **`backup_name` set** — restores the config **byte-for-byte** from that
+  backup. This is the only revert that can bring back a pre-existing
+  same-named entry that a `force=true` connect overwrote (surgical
+  `DELETE /connect/{client}` cannot).
+- **`backup_name` empty** — the connect created the file (its result carried no
+  `backup_path`); undo deletes the created file, restoring the "no file" state.
+
+Safety semantics:
+
+- Undo **refuses with `409 Conflict`** when the config changed since the
+  connect (it verifies the current file is byte-identical to what that connect
+  wrote) — it never clobbers later edits. Fall back to
+  `DELETE /connect/{client}` for a surgical entry removal.
+- A vanished backup returns `404`; a `backup_name` that is a path (contains a
+  directory separator) or does not match `<config>.bak.*` for that client
+  returns `400`.
+- Undo takes its **own safety backup** of the current file before restoring or
+  deleting, returned as `backup_path` in the result
+  (`action` = `restored` or `deleted`).
+- A macOS App-Data denial returns `403` + remediation, like the other
+  per-client routes.
+
 ##### macOS App Data privacy & Connect
 
 On macOS, client configs (Claude Desktop, Cursor, VS Code, …) live under another
@@ -698,7 +756,8 @@ tccutil reset SystemPolicyAppData com.smartmcpproxy.mcpproxy
 ```
 
 The overall `GET /api/v1/connect` listing never triggers this prompt (it is
-content-read-free); only the per-client read above can.
+content-read-free); only the per-client routes above (status, preview,
+connect/disconnect, undo) can.
 
 ### Real-time Updates
 
diff --git a/docs/setup.md b/docs/setup.md
index 5c359ed4..5e9c9e4c 100644
--- a/docs/setup.md
+++ b/docs/setup.md
@@ -254,7 +254,7 @@ Add mcpproxy as a remote MCP server via Settings → Connectors → Add Custom C
 
 #### Option A: Free Plan — JSON Configuration
 
-> **💡 Built-in wizard:** mcpproxy's **Connect** wizard (Web UI / tray) can write this bridge configuration for you — pick **Claude Desktop**, click **Review & connect** to see the exact entry that will be written (a timestamped backup is created first), then confirm with **Connect**. It registers the `npx -y mcp-remote` bridge shown below (Node.js required). The manual steps remain available if you prefer to edit the file yourself.
+> **💡 Built-in wizard:** mcpproxy's **Connect** wizard (Web UI / tray) can write this bridge configuration for you — pick **Claude Desktop**, click **Review & connect** to see the exact entry that will be written (a timestamped backup is created first), then confirm with **Connect**. It registers the `npx -y mcp-remote` bridge shown below (Node.js required). The manual steps remain available if you prefer to edit the file yourself. Changed your mind? The wizard offers a one-click **Undo** right next to the backup path it just showed: it reverts the connect by restoring the config byte-for-byte from that backup (or removing the file if the connect created it), and it refuses — rather than clobbering your edits — if the file changed in the meantime. Backups are never overwritten: two operations in the same second get distinct names (`.bak.<timestamp>-1`, `-2`, …), and none are deleted automatically.
 
 1. Create the config file if it doesn't exist:
 
diff --git a/frontend/src/components/ConnectModal.vue b/frontend/src/components/ConnectModal.vue
index 4ab97c82..e34de74a 100644
--- a/frontend/src/components/ConnectModal.vue
+++ b/frontend/src/components/ConnectModal.vue
@@ -240,6 +240,69 @@
         >
           No prior config file existed, so no backup was needed.
         </div>
+        <!-- Spec 078 US3: one-click undo of the connect just performed (session-
+             scoped). Clicking Undo first shows the change to be reverted
+             (FR-009); the restore only runs on the panel's confirm. -->
+        <div
+          v-if="resultSuccess && lastConnect && !undoPanelOpen"
+          data-test="connect-undo-offer"
+          class="mt-2 flex items-center justify-between gap-2 rounded-lg bg-base-200 px-3 py-2"
+        >
+          <span class="text-xs opacity-70">Changed your mind? You can revert this connect.</span>
+          <button
+            data-test="connect-undo"
+            @click="undoPanelOpen = true"
+            class="btn btn-ghost btn-xs shrink-0 text-error"
+            :disabled="undoBusy"
+            title="Revert this connect: restore the config to its pre-connect state"
+          >
+            Undo
+          </button>
+        </div>
+        <div
+          v-if="resultSuccess && lastConnect && undoPanelOpen"
+          data-test="connect-undo-panel"
+          class="mt-2 rounded-lg bg-base-200/60 border border-error/40 px-3 py-2 space-y-2"
+        >
+          <p class="text-xs opacity-70 leading-relaxed">
+            <template v-if="lastConnect.backupPath">
+              Undo restores
+              <code class="font-mono text-[11px] break-all">{{ lastConnect.configPath }}</code>
+              to its exact pre-connect state from the backup (a safety copy of the current file is saved first).
+            </template>
+            <template v-else>
+              Undo removes
+              <code class="font-mono text-[11px] break-all">{{ lastConnect.configPath }}</code>
+              — it did not exist before mcpproxy connected (a safety copy is saved first).
+            </template>
+          </p>
+          <div v-if="lastConnect.preview">
+            <div class="text-[11px] font-semibold uppercase tracking-wider text-error/80 mb-1">− will be reverted</div>
+            <pre
+              data-test="connect-undo-entry"
+              class="text-[11px] font-mono whitespace-pre-wrap break-all rounded bg-base-300/60 border-l-2 border-error px-2 py-1.5 leading-relaxed"
+            >{{ lastConnect.preview.entry_text }}</pre>
+          </div>
+          <div class="flex items-center gap-2 pt-0.5">
+            <button
+              data-test="connect-undo-confirm"
+              @click="confirmUndo"
+              class="btn btn-error btn-xs"
+              :disabled="undoBusy"
+            >
+              <span v-if="undoBusy" class="loading loading-spinner loading-xs"></span>
+              <span v-else>Undo connect</span>
+            </button>
+            <button
+              data-test="connect-undo-cancel"
+              @click="undoPanelOpen = false"
+              class="btn btn-ghost btn-xs"
+              :disabled="undoBusy"
+            >
+              Keep
+            </button>
+          </div>
+        </div>
         <!-- Spec 078 US2 / SC-005: Connect All renders EVERY successful
              client's backup outcome — one line per client, each with its own
              copy affordance — instead of only the last connect's path. -->
@@ -341,6 +404,19 @@ const copiedClient = ref<string | null>(null)
 const previews = ref<Record<string, ConnectPreview>>({})
 const previewLoading = reactive<Record<string, boolean>>({})
 const previewError = ref<Record<string, string>>({})
+// Spec 078 US3: the connect performed last in THIS modal session, so a one-
+// click Undo can revert it. preview is the confirmed preview snapshot (what
+// was written), shown again in the undo panel before reverting (FR-009).
+// null = no undoable connect (none yet, undone, disconnected, or bulk run).
+const lastConnect = ref<{
+  id: string
+  serverName: string
+  configPath: string
+  backupPath: string | null
+  preview?: ConnectPreview
+} | null>(null)
+const undoPanelOpen = ref(false)
+const undoBusy = ref(false)
 
 // MCP-2952: `GET /api/v1/connect` is stat-only (#706/MCP-2829) and reports
 // connected=false for every client. Merge the content-resolved
@@ -457,20 +533,34 @@ function clearPreview(clientId: string) {
 // Confirm proceeds with the connect. If an entry already exists, confirming
 // implies force=true (the user saw the overwrite warning in the preview).
 async function confirmConnect(clientId: string) {
-  const force = previews.value[clientId]?.entry_exists === true
+  const preview = previews.value[clientId]
+  const force = preview?.entry_exists === true
   bulkBackups.value = []
   copiedBulkClient.value = null
-  await connect(clientId, force)
+  const outcome = await connect(clientId, force)
+  // Spec 078 US3: a successful single connect becomes undoable in this session.
+  if (outcome.ok) {
+    lastConnect.value = {
+      id: clientId,
+      serverName: 'mcpproxy',
+      configPath: outcome.configPath,
+      backupPath: outcome.backupPath,
+      preview,
+    }
+    undoPanelOpen.value = false
+  }
   clearPreview(clientId)
 }
 
 // Returns the outcome so connectAll can accumulate per-client backup results
 // (ok=true with backupPath string = backup created; null = no prior file).
-async function connect(clientId: string, force = false): Promise<{ ok: boolean; backupPath: string | null }> {
+async function connect(clientId: string, force = false): Promise<{ ok: boolean; backupPath: string | null; configPath: string }> {
   loading.clients[clientId] = true
   resultMessage.value = ''
   resultBackupPath.value = undefined
   copiedBackup.value = false
+  lastConnect.value = null
+  undoPanelOpen.value = false
 
   try {
     const response = await api.connectClient(clientId, 'mcpproxy', force)
@@ -486,7 +576,7 @@ async function connect(clientId: string, force = false): Promise<{ ok: boolean;
         title: 'Client Connected',
         message: `MCPProxy registered in ${clientId}`,
       })
-      return { ok: true, backupPath }
+      return { ok: true, backupPath, configPath: response.data.config_path }
     }
     resultMessage.value = response.error || 'Failed to connect'
     resultSuccess.value = false
@@ -500,7 +590,43 @@ async function connect(clientId: string, force = false): Promise<{ ok: boolean;
   } finally {
     loading.clients[clientId] = false
   }
-  return { ok: false, backupPath: null }
+  return { ok: false, backupPath: null, configPath: '' }
+}
+
+// Spec 078 US3: revert the last connect performed in this modal session. The
+// backend refuses (409) when the config changed since the connect — surfaced
+// honestly as the error message; it never clobbers later edits.
+async function confirmUndo() {
+  const target = lastConnect.value
+  if (!target) return
+  undoBusy.value = true
+  try {
+    const response = await api.undoConnectClient(target.id, target.serverName, target.backupPath)
+    if (response.success && response.data) {
+      resultMessage.value = response.data.message || `Reverted the ${target.id} connect`
+      resultSuccess.value = true
+      resultBackupPath.value = undefined
+      lastConnect.value = null
+      undoPanelOpen.value = false
+      await fetchClients()
+      void onboarding.fetchState()
+      systemStore.addToast({
+        type: 'info',
+        title: 'Connect undone',
+        message: `${target.id} restored to its pre-connect state`,
+      })
+    } else {
+      resultMessage.value = response.error || 'Failed to undo the connect'
+      resultSuccess.value = false
+      undoPanelOpen.value = false
+    }
+  } catch (err) {
+    resultMessage.value = err instanceof Error ? err.message : 'Unknown error'
+    resultSuccess.value = false
+    undoPanelOpen.value = false
+  } finally {
+    undoBusy.value = false
+  }
 }
 
 async function disconnect(clientId: string) {
@@ -510,6 +636,9 @@ async function disconnect(clientId: string) {
   copiedBackup.value = false
   bulkBackups.value = []
   copiedBulkClient.value = null
+  // A disconnect supersedes any pending session undo (the entry is gone).
+  lastConnect.value = null
+  undoPanelOpen.value = false
 
   try {
     const client = clients.value.find(c => c.id === clientId)
@@ -657,6 +786,8 @@ function close() {
   copiedBulkClient.value = null
   previews.value = {}
   previewError.value = {}
+  lastConnect.value = null
+  undoPanelOpen.value = false
   emit('close')
 }
 
@@ -674,6 +805,8 @@ watch(() => props.show, (newVal) => {
     copiedBulkClient.value = null
     previews.value = {}
     previewError.value = {}
+    lastConnect.value = null
+    undoPanelOpen.value = false
   }
 })
 </script>
diff --git a/frontend/src/components/OnboardingWizard.vue b/frontend/src/components/OnboardingWizard.vue
index 85fb3ad5..86f77fef 100644
--- a/frontend/src/components/OnboardingWizard.vue
+++ b/frontend/src/components/OnboardingWizard.vue
@@ -73,10 +73,16 @@
                 :preview="previews[c.id]"
                 :preview-busy="previewBusy[c.id]"
                 :preview-error="previewErrors[c.id]"
+                :undo-preview="undoPreviews[c.id]"
+                :undo-open="undoOpen[c.id]"
+                :undo-busy="undoBusy[c.id]"
                 @copy-backup="copyBackupPath"
                 @connect="startConnect"
                 @confirm="confirmConnect"
                 @cancel="cancelPreview"
+                @undo="startUndo"
+                @confirm-undo="confirmUndo"
+                @cancel-undo="cancelUndo"
               />
             </div>
 
@@ -93,10 +99,16 @@
                 :preview="previews[c.id]"
                 :preview-busy="previewBusy[c.id]"
                 :preview-error="previewErrors[c.id]"
+                :undo-preview="undoPreviews[c.id]"
+                :undo-open="undoOpen[c.id]"
+                :undo-busy="undoBusy[c.id]"
                 @copy-backup="copyBackupPath"
                 @connect="startConnect"
                 @confirm="confirmConnect"
                 @cancel="cancelPreview"
+                @undo="startUndo"
+                @confirm-undo="confirmUndo"
+                @cancel-undo="cancelUndo"
               />
             </div>
 
@@ -117,10 +129,16 @@
                   :preview="previews[c.id]"
                   :preview-busy="previewBusy[c.id]"
                   :preview-error="previewErrors[c.id]"
+                  :undo-preview="undoPreviews[c.id]"
+                  :undo-open="undoOpen[c.id]"
+                  :undo-busy="undoBusy[c.id]"
                   @copy-backup="copyBackupPath"
                   @connect="startConnect"
                   @confirm="confirmConnect"
                   @cancel="cancelPreview"
+                  @undo="startUndo"
+                  @confirm-undo="confirmUndo"
+                  @cancel-undo="cancelUndo"
                 />
               </div>
             </details>
@@ -553,6 +571,13 @@ const copiedBackupClient = ref<string | null>(null)
 const previews = reactive<Record<string, ConnectPreview>>({})
 const previewBusy = reactive<Record<string, boolean>>({})
 const previewErrors = reactive<Record<string, string>>({})
+// Spec 078 US3: session-scoped one-click undo. undoPreviews snapshots the
+// preview the user confirmed, so the revert panel can show the change about to
+// be reverted (FR-009) without another config read. undoOpen[id] shows the
+// confirm panel; the actual restore only happens on its confirm button.
+const undoPreviews = reactive<Record<string, ConnectPreview>>({})
+const undoOpen = reactive<Record<string, boolean>>({})
+const undoBusy = reactive<Record<string, boolean>>({})
 const addServerOpen = ref(false)
 const serverAddedJustNow = ref(false)
 
@@ -736,6 +761,10 @@ watch(() => props.show, async (open) => {
     // confirm/cancel panel from a previous wizard session.
     for (const k of Object.keys(previews)) delete previews[k]
     for (const k of Object.keys(previewErrors)) delete previewErrors[k]
+    // Spec 078 US3: undo is session-scoped (it reverts the connect performed
+    // in THIS wizard session) — a reopened wizard starts without undo state.
+    for (const k of Object.keys(undoPreviews)) delete undoPreviews[k]
+    for (const k of Object.keys(undoOpen)) delete undoOpen[k]
     await onboarding.fetchState()
     await Promise.all([
       fetchClients(),
@@ -1093,13 +1122,14 @@ function cancelPreview(clientId: string) {
 // Confirm proceeds; an existing same-named entry implies force=true (the user
 // saw the overwrite warning in the preview).
 async function confirmConnect(clientId: string) {
-  const force = previews[clientId]?.entry_exists === true
+  const preview = previews[clientId]
+  const force = preview?.entry_exists === true
   delete previews[clientId]
   delete previewErrors[clientId]
-  await connectOne(clientId, force)
+  await connectOne(clientId, force, preview)
 }
 
-async function connectOne(clientId: string, force = false) {
+async function connectOne(clientId: string, force = false, preview?: ConnectPreview) {
   busyClients[clientId] = true
   connectMessage.value = ''
   try {
@@ -1110,6 +1140,10 @@ async function connectOne(clientId: string, force = false) {
       // Spec 078 US2: keep the backup path so the row can surface it; an
       // empty/absent backup_path on success means no prior file existed.
       connectBackups[clientId] = res.data.backup_path || null
+      // Spec 078 US3: remember what was written so the Undo panel can show
+      // the change it is about to revert (FR-009).
+      if (preview) undoPreviews[clientId] = preview
+      delete undoOpen[clientId]
       await fetchClients()
       // Spec 046 — record connect-step completion for telemetry funnel.
       // Only the first successful connect transitions the status; subsequent
@@ -1151,6 +1185,54 @@ async function copyBackupPath(clientId: string) {
   }
 }
 
+// Spec 078 US3 / FR-009: Undo shows the change to be reverted first; the
+// restore only runs from the panel's confirm button.
+function startUndo(clientId: string) {
+  undoOpen[clientId] = true
+}
+
+function cancelUndo(clientId: string) {
+  delete undoOpen[clientId]
+}
+
+async function confirmUndo(clientId: string) {
+  undoBusy[clientId] = true
+  connectMessage.value = ''
+  try {
+    const res = await api.undoConnectClient(clientId, 'mcpproxy', connectBackups[clientId] ?? null)
+    if (res.success && res.data) {
+      connectMessageOk.value = true
+      connectMessage.value = res.data.message || `Undid the ${clientId} connect`
+      delete connectBackups[clientId]
+      delete undoPreviews[clientId]
+      delete undoOpen[clientId]
+      await fetchClients()
+      // Telemetry (FR-016): connect_step completion is a one-time funnel
+      // transition and is deliberately NOT retracted on undo — the user did
+      // complete the step; undo is a reversal of the file change, not of the
+      // funnel event.
+      await onboarding.fetchState()
+      systemStore.addToast({
+        type: 'info',
+        title: 'Connect undone',
+        message: `${clientId} restored to its pre-connect state`,
+      })
+    } else {
+      // Honest refusal (e.g. the config changed since the connect): show the
+      // backend's message and keep the row's state so the user can decide.
+      connectMessageOk.value = false
+      connectMessage.value = res.error ?? 'Failed to undo the connect'
+      delete undoOpen[clientId]
+    }
+  } catch (err) {
+    connectMessageOk.value = false
+    connectMessage.value = (err as Error).message
+    delete undoOpen[clientId]
+  } finally {
+    undoBusy[clientId] = false
+  }
+}
+
 function openAddServer() {
   addServerOpen.value = true
 }
@@ -1218,12 +1300,18 @@ const ClientRow: FunctionalComponent<
     preview?: ConnectPreview
     previewBusy?: boolean
     previewError?: string
+    undoPreview?: ConnectPreview
+    undoOpen?: boolean
+    undoBusy?: boolean
   },
   {
     connect: (id: string) => void
     'copy-backup': (id: string) => void
     confirm: (id: string) => void
     cancel: (id: string) => void
+    undo: (id: string) => void
+    'confirm-undo': (id: string) => void
+    'cancel-undo': (id: string) => void
   }
 > = (props, { emit: rowEmit }) => {
   const c = props.client
@@ -1264,6 +1352,19 @@ const ClientRow: FunctionalComponent<
   // Spec 078 US2 / FR-006: after a connect performed in this wizard session,
   // surface the timestamped backup (or the honest "no prior file" case) right
   // in the row. undefined = no connect happened for this client yet.
+  // Spec 078 US3: the same line carries the one-click Undo affordance —
+  // reverting is offered exactly where the change was reported.
+  const undoButton = h(
+    'button',
+    {
+      class: 'btn btn-ghost btn-xs shrink-0 text-error',
+      disabled: props.undoBusy,
+      'data-test': `client-undo-${c.id}`,
+      title: 'Revert this connect: restore the config to its pre-connect state',
+      onClick: () => rowEmit('undo', c.id),
+    },
+    'Undo'
+  )
   const backupLine =
     props.backupPath !== undefined
       ? h(
@@ -1278,21 +1379,101 @@ const ClientRow: FunctionalComponent<
                   'A backup of your previous config was saved to ',
                   h('code', { class: 'font-mono', title: props.backupPath }, props.backupPath),
                 ]),
+                h('span', { class: 'flex items-center shrink-0' }, [
+                  h(
+                    'button',
+                    {
+                      class: 'btn btn-ghost btn-xs shrink-0',
+                      'data-test': `client-copy-backup-${c.id}`,
+                      title: 'Copy the backup path to the clipboard',
+                      onClick: () => rowEmit('copy-backup', c.id),
+                    },
+                    props.copiedBackup ? 'Copied ✓' : 'Copy path'
+                  ),
+                  undoButton,
+                ]),
+              ]
+            : [
                 h(
-                  'button',
-                  {
-                    class: 'btn btn-ghost btn-xs shrink-0',
-                    'data-test': `client-copy-backup-${c.id}`,
-                    title: 'Copy the backup path to the clipboard',
-                    onClick: () => rowEmit('copy-backup', c.id),
-                  },
-                  props.copiedBackup ? 'Copied ✓' : 'Copy path'
+                  'span',
+                  { class: 'min-w-0 leading-relaxed' },
+                  'No prior config file existed, so no backup was needed.'
                 ),
+                undoButton,
               ]
-            : 'No prior config file existed, so no backup was needed.'
         )
       : null
 
+  // Spec 078 US3 / FR-009: before reverting, show the change that will be
+  // undone (the entry the confirmed preview wrote). Confirm/Keep gate the
+  // actual restore; Keep changes nothing.
+  const up = props.undoPreview
+  const undoPanel = props.undoOpen
+    ? h(
+        'div',
+        {
+          class: 'mt-2 rounded-lg bg-base-200/60 border border-error/40 px-3 py-2 space-y-2',
+          'data-test': `client-undo-panel-${c.id}`,
+        },
+        [
+          h(
+            'p',
+            { class: 'text-xs opacity-70 leading-relaxed' },
+            props.backupPath
+              ? [
+                  'Undo restores ',
+                  h('code', { class: 'font-mono text-[11px] break-all' }, up?.config_path ?? c.config_path),
+                  ' to its exact pre-connect state from the backup (a safety copy of the current file is saved first).',
+                ]
+              : [
+                  'Undo removes ',
+                  h('code', { class: 'font-mono text-[11px] break-all' }, up?.config_path ?? c.config_path),
+                  ' — it did not exist before mcpproxy connected (a safety copy is saved first).',
+                ]
+          ),
+          up
+            ? h('div', {}, [
+                h(
+                  'div',
+                  { class: 'text-[11px] font-semibold uppercase tracking-wider text-error/80 mb-1' },
+                  '− will be reverted'
+                ),
+                h(
+                  'pre',
+                  {
+                    class: 'text-[11px] font-mono whitespace-pre-wrap break-all rounded bg-base-300/60 border-l-2 border-error px-2 py-1.5 leading-relaxed',
+                    'data-test': `client-undo-entry-${c.id}`,
+                  },
+                  up.entry_text
+                ),
+              ])
+            : null,
+          h('div', { class: 'flex items-center gap-2 pt-0.5' }, [
+            h(
+              'button',
+              {
+                class: 'btn btn-error btn-xs',
+                disabled: props.undoBusy,
+                'data-test': `client-undo-confirm-${c.id}`,
+                onClick: () => rowEmit('confirm-undo', c.id),
+              },
+              props.undoBusy ? [h('span', { class: 'loading loading-spinner loading-xs' })] : ['Undo connect']
+            ),
+            h(
+              'button',
+              {
+                class: 'btn btn-ghost btn-xs',
+                disabled: props.undoBusy,
+                'data-test': `client-undo-cancel-${c.id}`,
+                onClick: () => rowEmit('cancel-undo', c.id),
+              },
+              'Keep'
+            ),
+          ]),
+        ]
+      )
+    : null
+
   // Spec 078 US1 / FR-001,003,004: preview the exact change before writing.
   // Only this entry is added; everything else in the file is untouched. The
   // Connect/Cancel buttons gate the actual write (Cancel writes nothing).
@@ -1386,6 +1567,7 @@ const ClientRow: FunctionalComponent<
 
   const children = [row]
   if (backupLine) children.push(backupLine)
+  if (undoPanel) children.push(undoPanel)
   if (previewPanel) children.push(previewPanel)
   if (previewErrorLine) children.push(previewErrorLine)
   return h(
@@ -1405,6 +1587,9 @@ ClientRow.props = {
   preview: { type: Object, default: undefined },
   previewBusy: { type: Boolean, default: false },
   previewError: { type: String, default: undefined },
+  undoPreview: { type: Object, default: undefined },
+  undoOpen: { type: Boolean, default: false },
+  undoBusy: { type: Boolean, default: false },
 }
-ClientRow.emits = ['connect', 'copy-backup', 'confirm', 'cancel']
+ClientRow.emits = ['connect', 'copy-backup', 'confirm', 'cancel', 'undo', 'confirm-undo', 'cancel-undo']
 </script>
diff --git a/frontend/src/services/api.ts b/frontend/src/services/api.ts
index bc8ad2b3..7c503f1f 100644
--- a/frontend/src/services/api.ts
+++ b/frontend/src/services/api.ts
@@ -1188,6 +1188,28 @@ class APIService {
     })
   }
 
+  // Spec 078 US3: one-click undo of the immediately-preceding connect.
+  // backupPath is the backup_path that connect returned (null = no prior file
+  // existed, so undo removes the file connect created). The backend refuses
+  // with 409 when the config changed since the connect (never clobbers edits).
+  //
+  // The wire payload carries only the backup's bare FILENAME (backup_name), not
+  // a path: the server resolves the full path inside the client's own config
+  // directory and never trusts a client-supplied path (defense against path
+  // injection). We strip any directory component here on both / and \ so a
+  // Windows path resolves the same way.
+  async undoConnectClient(
+    clientId: string,
+    serverName = 'mcpproxy',
+    backupPath: string | null = null
+  ): Promise<APIResponse<ConnectResult>> {
+    const backupName = backupPath ? (backupPath.split(/[/\\]/).pop() ?? '') : ''
+    return this.request<ConnectResult>(`/api/v1/connect/${encodeURIComponent(clientId)}/undo`, {
+      method: 'POST',
+      body: JSON.stringify({ server_name: serverName, backup_name: backupName }),
+    })
+  }
+
   async disconnectClient(clientId: string, serverName = 'mcpproxy'): Promise<APIResponse<ConnectResult>> {
     return this.request<ConnectResult>(`/api/v1/connect/${encodeURIComponent(clientId)}`, {
       method: 'DELETE',
diff --git a/frontend/tests/unit/connect-modal-undo.spec.ts b/frontend/tests/unit/connect-modal-undo.spec.ts
new file mode 100644
index 00000000..64505620
--- /dev/null
+++ b/frontend/tests/unit/connect-modal-undo.spec.ts
@@ -0,0 +1,218 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest'
+import { mount, flushPromises } from '@vue/test-utils'
+import { createPinia, setActivePinia } from 'pinia'
+import ConnectModal from '@/components/ConnectModal.vue'
+import api from '@/services/api'
+
+// Spec 078 US3: the standalone Connect modal offers a session-scoped one-click
+// Undo on the post-connect result area, mirroring the wizard row. The revert
+// panel shows the change to be reverted (FR-009) before anything runs.
+
+vi.mock('@/services/api', () => ({
+  default: {
+    getConnectStatus: vi.fn(),
+    getConnectClientStatus: vi.fn(),
+    getConnectPreview: vi.fn(),
+    connectClient: vi.fn(),
+    disconnectClient: vi.fn(),
+    undoConnectClient: vi.fn(),
+    getOnboardingState: vi.fn(),
+  },
+}))
+
+const BACKUP = '/Users/test/.cursor/mcp.json.bak.20260703-101530'
+
+function previewOk(overrides: Record<string, unknown> = {}) {
+  return {
+    success: true,
+    data: {
+      client: 'cursor',
+      config_path: '/Users/test/.cursor/mcp.json',
+      format: 'json',
+      server_key: 'mcpServers',
+      server_name: 'mcpproxy',
+      entry: { type: 'sse', url: 'http://127.0.0.1:8080/mcp' },
+      entry_text: '{\n  "mcpproxy": {\n    "url": "http://127.0.0.1:8080/mcp",\n    "type": "sse"\n  }\n}',
+      entry_exists: false,
+      contains_api_key: false,
+      access_state: 'accessible',
+      ...overrides,
+    },
+  }
+}
+
+function cursorClient(connected = false) {
+  return {
+    id: 'cursor',
+    name: 'Cursor',
+    config_path: '/Users/test/.cursor/mcp.json',
+    exists: true,
+    connected,
+    supported: true,
+    icon: 'cursor',
+  }
+}
+
+function connectOk(backupPath?: string) {
+  return {
+    success: true,
+    data: {
+      success: true,
+      client: 'cursor',
+      config_path: '/Users/test/.cursor/mcp.json',
+      ...(backupPath ? { backup_path: backupPath } : {}),
+      server_name: 'mcpproxy',
+      action: 'created',
+      message: 'MCPProxy registered in Cursor as mcpproxy',
+    },
+  }
+}
+
+async function openModal(pinia: any) {
+  const wrapper = mount(ConnectModal, {
+    props: { show: false },
+    global: { plugins: [pinia] },
+  })
+  await wrapper.setProps({ show: true })
+  await flushPromises()
+  return wrapper
+}
+
+async function connectViaPreview(wrapper: any, clientId: string) {
+  await wrapper.find(`[data-test="connect-start-${clientId}"]`).trigger('click')
+  await flushPromises()
+  await wrapper.find(`[data-test="connect-preview-confirm-${clientId}"]`).trigger('click')
+  await flushPromises()
+}
+
+describe('ConnectModal one-click undo (Spec 078 US3)', () => {
+  let pinia: any
+
+  beforeEach(() => {
+    pinia = createPinia()
+    setActivePinia(pinia)
+    vi.clearAllMocks()
+    ;(api.getOnboardingState as any).mockResolvedValue({ success: true, data: null })
+    ;(api.getConnectStatus as any).mockResolvedValue({ success: true, data: [cursorClient()] })
+    ;(api.getConnectPreview as any).mockResolvedValue(previewOk())
+    ;(api.connectClient as any).mockResolvedValue(connectOk(BACKUP))
+  })
+
+  it('offers Undo after a connect and reverts on the panel confirm', async () => {
+    ;(api.undoConnectClient as any).mockResolvedValue({
+      success: true,
+      data: {
+        success: true,
+        client: 'cursor',
+        config_path: '/Users/test/.cursor/mcp.json',
+        backup_path: '/Users/test/.cursor/mcp.json.bak.20260703-101545',
+        server_name: 'mcpproxy',
+        action: 'restored',
+        message: `Restored /Users/test/.cursor/mcp.json from backup ${BACKUP}`,
+      },
+    })
+
+    const wrapper = await openModal(pinia)
+    expect(wrapper.find('[data-test="connect-undo"]').exists()).toBe(false)
+
+    await connectViaPreview(wrapper, 'cursor')
+
+    // Undo offer appears alongside the backup-path result.
+    expect(wrapper.find('[data-test="connect-backup-path"]').exists()).toBe(true)
+    const undoBtn = wrapper.find('[data-test="connect-undo"]')
+    expect(undoBtn.exists()).toBe(true)
+
+    // FR-009: the change to be reverted is shown BEFORE anything runs.
+    await undoBtn.trigger('click')
+    await flushPromises()
+    expect(api.undoConnectClient).not.toHaveBeenCalled()
+    const panel = wrapper.find('[data-test="connect-undo-panel"]')
+    expect(panel.exists()).toBe(true)
+    expect(panel.text()).toContain('will be reverted')
+    expect(wrapper.find('[data-test="connect-undo-entry"]').text()).toContain('http://127.0.0.1:8080/mcp')
+
+    await wrapper.find('[data-test="connect-undo-confirm"]').trigger('click')
+    await flushPromises()
+
+    expect(api.undoConnectClient).toHaveBeenCalledWith('cursor', 'mcpproxy', BACKUP)
+    expect(wrapper.text()).toContain('Restored /Users/test/.cursor/mcp.json from backup')
+    // The undo affordance is consumed: session offers it once per connect.
+    expect(wrapper.find('[data-test="connect-undo"]').exists()).toBe(false)
+    expect(wrapper.find('[data-test="connect-undo-panel"]').exists()).toBe(false)
+  })
+
+  it('Keep closes the panel without calling undo', async () => {
+    const wrapper = await openModal(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+
+    await wrapper.find('[data-test="connect-undo"]').trigger('click')
+    await flushPromises()
+    await wrapper.find('[data-test="connect-undo-cancel"]').trigger('click')
+    await flushPromises()
+
+    expect(api.undoConnectClient).not.toHaveBeenCalled()
+    expect(wrapper.find('[data-test="connect-undo-panel"]').exists()).toBe(false)
+    expect(wrapper.find('[data-test="connect-undo"]').exists()).toBe(true)
+  })
+
+  it('states the file removal for the no-prior-file case and passes null backup', async () => {
+    ;(api.connectClient as any).mockResolvedValue(connectOk(undefined))
+    ;(api.undoConnectClient as any).mockResolvedValue({
+      success: true,
+      data: {
+        success: true,
+        client: 'cursor',
+        config_path: '/Users/test/.cursor/mcp.json',
+        backup_path: '/Users/test/.cursor/mcp.json.bak.20260703-101545',
+        server_name: 'mcpproxy',
+        action: 'deleted',
+        message: 'Removed /Users/test/.cursor/mcp.json — it did not exist before mcpproxy connected',
+      },
+    })
+
+    const wrapper = await openModal(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+
+    expect(wrapper.find('[data-test="connect-no-backup"]').exists()).toBe(true)
+    await wrapper.find('[data-test="connect-undo"]').trigger('click')
+    await flushPromises()
+    expect(wrapper.find('[data-test="connect-undo-panel"]').text()).toContain('Undo removes')
+
+    await wrapper.find('[data-test="connect-undo-confirm"]').trigger('click')
+    await flushPromises()
+
+    expect(api.undoConnectClient).toHaveBeenCalledWith('cursor', 'mcpproxy', null)
+    expect(wrapper.text()).toContain('Removed /Users/test/.cursor/mcp.json')
+  })
+
+  it('surfaces a drift refusal (409) honestly without pretending it undid', async () => {
+    ;(api.undoConnectClient as any).mockResolvedValue({
+      success: false,
+      error:
+        '/Users/test/.cursor/mcp.json changed since mcpproxy connected; refusing to restore the backup over your edits. Use disconnect to remove just the mcpproxy entry.',
+    })
+
+    const wrapper = await openModal(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+
+    await wrapper.find('[data-test="connect-undo"]').trigger('click')
+    await flushPromises()
+    await wrapper.find('[data-test="connect-undo-confirm"]').trigger('click')
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('changed since mcpproxy connected')
+  })
+
+  it('does not carry the undo offer across modal sessions', async () => {
+    const wrapper = await openModal(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+    expect(wrapper.find('[data-test="connect-undo"]').exists()).toBe(true)
+
+    await wrapper.setProps({ show: false })
+    await flushPromises()
+    await wrapper.setProps({ show: true })
+    await flushPromises()
+
+    expect(wrapper.find('[data-test="connect-undo"]').exists()).toBe(false)
+  })
+})
diff --git a/frontend/tests/unit/connect-undo-api.spec.ts b/frontend/tests/unit/connect-undo-api.spec.ts
new file mode 100644
index 00000000..e400bfa3
--- /dev/null
+++ b/frontend/tests/unit/connect-undo-api.spec.ts
@@ -0,0 +1,68 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
+
+// Spec 078 US3 / CodeQL hardening: the undo request must carry only the backup's
+// bare FILENAME (backup_name), never a path. The server resolves the full path
+// inside the client's own config dir and never trusts a client-supplied path, so
+// api.undoConnectClient strips any directory component before sending.
+
+describe('api.undoConnectClient — sends a bare backup_name (not a path)', () => {
+  let fetchMock: ReturnType<typeof vi.fn>
+
+  beforeEach(() => {
+    fetchMock = vi.fn().mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: async () => ({ success: true, data: { success: true, action: 'restored' } }),
+    })
+    vi.stubGlobal('fetch', fetchMock)
+  })
+
+  afterEach(() => {
+    vi.unstubAllGlobals()
+    vi.resetModules()
+  })
+
+  async function freshApi() {
+    vi.resetModules()
+    const mod = await import('@/services/api')
+    return mod.default
+  }
+
+  it('POSTs the basename of a POSIX backup path', async () => {
+    const api = await freshApi()
+    await api.undoConnectClient('cursor', 'mcpproxy', '/Users/test/.cursor/mcp.json.bak.20260703-101530')
+
+    const [url, opts] = fetchMock.mock.calls[0]
+    expect(url).toBe('/api/v1/connect/cursor/undo')
+    expect(opts.method).toBe('POST')
+    expect(JSON.parse(opts.body)).toEqual({
+      server_name: 'mcpproxy',
+      backup_name: 'mcp.json.bak.20260703-101530',
+    })
+  })
+
+  it('strips a Windows backslash directory component too', async () => {
+    const api = await freshApi()
+    await api.undoConnectClient(
+      'claude-desktop',
+      'mcpproxy',
+      'C:\\Users\\test\\AppData\\claude_desktop_config.json.bak.20260703-101530'
+    )
+    const [, opts] = fetchMock.mock.calls[0]
+    expect(JSON.parse(opts.body).backup_name).toBe('claude_desktop_config.json.bak.20260703-101530')
+  })
+
+  it('sends an empty backup_name for the no-prior-file (null) case', async () => {
+    const api = await freshApi()
+    await api.undoConnectClient('cursor', 'mcpproxy', null)
+    const [, opts] = fetchMock.mock.calls[0]
+    expect(JSON.parse(opts.body)).toEqual({ server_name: 'mcpproxy', backup_name: '' })
+  })
+
+  it('percent-encodes a "/"-containing client id', async () => {
+    const api = await freshApi()
+    await api.undoConnectClient('weird/client', 'mcpproxy', null)
+    const [url] = fetchMock.mock.calls[0]
+    expect(url).toBe('/api/v1/connect/weird%2Fclient/undo')
+  })
+})
diff --git a/frontend/tests/unit/onboarding-wizard-undo.spec.ts b/frontend/tests/unit/onboarding-wizard-undo.spec.ts
new file mode 100644
index 00000000..b0bd7fbe
--- /dev/null
+++ b/frontend/tests/unit/onboarding-wizard-undo.spec.ts
@@ -0,0 +1,255 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest'
+import { mount, flushPromises } from '@vue/test-utils'
+import { createPinia, setActivePinia } from 'pinia'
+import OnboardingWizard from '@/components/OnboardingWizard.vue'
+import api from '@/services/api'
+
+// Spec 078 US3: after a connect performed in this wizard session, the client
+// row offers a one-click Undo next to the backup line. Clicking it first shows
+// the change to be reverted (FR-009); confirming restores the pre-connect file
+// and returns the row to its not-connected state.
+
+vi.mock('@/services/api', () => ({
+  default: {
+    getConnectStatus: vi.fn(),
+    getOnboardingState: vi.fn(),
+    markOnboardingState: vi.fn(),
+    getActivities: vi.fn(),
+    getConfig: vi.fn(),
+    getDockerStatus: vi.fn(),
+    getCanonicalConfigPaths: vi.fn(),
+    getConnectPreview: vi.fn(),
+    connectClient: vi.fn(),
+    undoConnectClient: vi.fn(),
+  },
+}))
+
+const BACKUP = '/Users/test/.cursor/mcp.json.bak.20260703-101530'
+
+function previewOk(overrides: Record<string, unknown> = {}) {
+  return {
+    success: true,
+    data: {
+      client: 'cursor',
+      config_path: '/Users/test/.cursor/mcp.json',
+      format: 'json',
+      server_key: 'mcpServers',
+      server_name: 'mcpproxy',
+      entry: { type: 'sse', url: 'http://127.0.0.1:8080/mcp' },
+      entry_text: '{\n  "mcpproxy": {\n    "url": "http://127.0.0.1:8080/mcp",\n    "type": "sse"\n  }\n}',
+      entry_exists: false,
+      contains_api_key: false,
+      access_state: 'accessible',
+      ...overrides,
+    },
+  }
+}
+
+function onboardingState(connectedIds: string[]) {
+  return {
+    success: true,
+    data: {
+      has_connected_client: connectedIds.length > 0,
+      has_configured_server: true,
+      connected_client_count: connectedIds.length,
+      connected_client_ids: connectedIds,
+      configured_server_count: 1,
+      state: { engaged: false },
+      should_show_wizard: true,
+      first_mcp_client_ever: false,
+      mcp_clients_seen_ever: [],
+      incomplete_tab_count: 0,
+    },
+  }
+}
+
+function cursorClient() {
+  return {
+    id: 'cursor',
+    name: 'Cursor',
+    config_path: '/Users/test/.cursor/mcp.json',
+    exists: true,
+    connected: false,
+    supported: true,
+    icon: 'cursor',
+  }
+}
+
+function connectOk(backupPath?: string) {
+  return {
+    success: true,
+    data: {
+      success: true,
+      client: 'cursor',
+      config_path: '/Users/test/.cursor/mcp.json',
+      ...(backupPath ? { backup_path: backupPath } : {}),
+      server_name: 'mcpproxy',
+      action: 'created',
+      message: 'MCPProxy registered in Cursor as mcpproxy',
+    },
+  }
+}
+
+async function openClientsTab(pinia: any) {
+  const wrapper = mount(OnboardingWizard, {
+    props: { show: false },
+    global: { plugins: [pinia] },
+  })
+  await wrapper.setProps({ show: true })
+  await flushPromises()
+  await wrapper.find('[data-test="tab-clients"]').trigger('click')
+  await flushPromises()
+  return wrapper
+}
+
+async function connectViaPreview(wrapper: any, clientId: string) {
+  await wrapper.find(`[data-test="connect-${clientId}"]`).trigger('click')
+  await flushPromises()
+  await wrapper.find(`[data-test="client-preview-confirm-${clientId}"]`).trigger('click')
+  await flushPromises()
+}
+
+describe('OnboardingWizard one-click undo (Spec 078 US3)', () => {
+  let pinia: any
+
+  beforeEach(() => {
+    pinia = createPinia()
+    setActivePinia(pinia)
+    vi.clearAllMocks()
+    ;(api.getActivities as any).mockResolvedValue({ success: true, data: { activities: [] } })
+    ;(api.getConfig as any).mockResolvedValue({ success: true, data: {} })
+    ;(api.getDockerStatus as any).mockResolvedValue({ success: true, data: { available: false } })
+    ;(api.getCanonicalConfigPaths as any).mockResolvedValue({ success: true, data: { paths: [] } })
+    ;(api.getOnboardingState as any).mockResolvedValue(onboardingState([]))
+    ;(api.markOnboardingState as any).mockResolvedValue(onboardingState([]))
+    ;(api.getConnectStatus as any).mockResolvedValue({ success: true, data: [cursorClient()] })
+    ;(api.getConnectPreview as any).mockResolvedValue(previewOk())
+    ;(api.connectClient as any).mockResolvedValue(connectOk(BACKUP))
+  })
+
+  it('offers Undo on the row after a connect, shows the revert panel, and restores on confirm', async () => {
+    ;(api.undoConnectClient as any).mockResolvedValue({
+      success: true,
+      data: {
+        success: true,
+        client: 'cursor',
+        config_path: '/Users/test/.cursor/mcp.json',
+        backup_path: '/Users/test/.cursor/mcp.json.bak.20260703-101545',
+        server_name: 'mcpproxy',
+        action: 'restored',
+        message: `Restored /Users/test/.cursor/mcp.json from backup ${BACKUP}`,
+      },
+    })
+
+    const wrapper = await openClientsTab(pinia)
+
+    // No undo affordance before any connect in this session.
+    expect(wrapper.find('[data-test="client-undo-cursor"]').exists()).toBe(false)
+
+    await connectViaPreview(wrapper, 'cursor')
+
+    const undoBtn = wrapper.find('[data-test="client-undo-cursor"]')
+    expect(undoBtn.exists()).toBe(true)
+
+    // FR-009: undo first shows the change to be reverted — nothing is called yet.
+    await undoBtn.trigger('click')
+    await flushPromises()
+    expect(api.undoConnectClient).not.toHaveBeenCalled()
+    const panel = wrapper.find('[data-test="client-undo-panel-cursor"]')
+    expect(panel.exists()).toBe(true)
+    expect(panel.text()).toContain('will be reverted')
+    expect(wrapper.find('[data-test="client-undo-entry-cursor"]').text()).toContain('http://127.0.0.1:8080/mcp')
+
+    await wrapper.find('[data-test="client-undo-confirm-cursor"]').trigger('click')
+    await flushPromises()
+
+    // The undo passes the exact backup path this session's connect returned.
+    expect(api.undoConnectClient).toHaveBeenCalledWith('cursor', 'mcpproxy', BACKUP)
+    // Row returns to its pre-connect state: backup line + panel gone, honest result shown.
+    expect(wrapper.find('[data-test="client-backup-cursor"]').exists()).toBe(false)
+    expect(wrapper.find('[data-test="client-undo-panel-cursor"]').exists()).toBe(false)
+    expect(wrapper.text()).toContain('Restored /Users/test/.cursor/mcp.json from backup')
+    // Review & connect is available again.
+    expect(wrapper.find('[data-test="connect-cursor"]').exists()).toBe(true)
+  })
+
+  it('Keep dismisses the revert panel without calling undo', async () => {
+    const wrapper = await openClientsTab(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+
+    await wrapper.find('[data-test="client-undo-cursor"]').trigger('click')
+    await flushPromises()
+    await wrapper.find('[data-test="client-undo-cancel-cursor"]').trigger('click')
+    await flushPromises()
+
+    expect(api.undoConnectClient).not.toHaveBeenCalled()
+    expect(wrapper.find('[data-test="client-undo-panel-cursor"]').exists()).toBe(false)
+    // The backup line (and thus the Undo affordance) is still there.
+    expect(wrapper.find('[data-test="client-backup-cursor"]').exists()).toBe(true)
+    expect(wrapper.find('[data-test="client-undo-cursor"]').exists()).toBe(true)
+  })
+
+  it('passes null backup for the no-prior-file case and states the file removal honestly', async () => {
+    ;(api.connectClient as any).mockResolvedValue(connectOk(undefined))
+    ;(api.undoConnectClient as any).mockResolvedValue({
+      success: true,
+      data: {
+        success: true,
+        client: 'cursor',
+        config_path: '/Users/test/.cursor/mcp.json',
+        backup_path: '/Users/test/.cursor/mcp.json.bak.20260703-101545',
+        server_name: 'mcpproxy',
+        action: 'deleted',
+        message: 'Removed /Users/test/.cursor/mcp.json — it did not exist before mcpproxy connected',
+      },
+    })
+
+    const wrapper = await openClientsTab(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+
+    await wrapper.find('[data-test="client-undo-cursor"]').trigger('click')
+    await flushPromises()
+    const panel = wrapper.find('[data-test="client-undo-panel-cursor"]')
+    expect(panel.text()).toContain('Undo removes')
+
+    await wrapper.find('[data-test="client-undo-confirm-cursor"]').trigger('click')
+    await flushPromises()
+
+    expect(api.undoConnectClient).toHaveBeenCalledWith('cursor', 'mcpproxy', null)
+    expect(wrapper.text()).toContain('Removed /Users/test/.cursor/mcp.json')
+  })
+
+  it('surfaces a drift refusal honestly and keeps the row state', async () => {
+    ;(api.undoConnectClient as any).mockResolvedValue({
+      success: false,
+      error:
+        '/Users/test/.cursor/mcp.json changed since mcpproxy connected; refusing to restore the backup over your edits. Use disconnect to remove just the mcpproxy entry.',
+    })
+
+    const wrapper = await openClientsTab(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+
+    await wrapper.find('[data-test="client-undo-cursor"]').trigger('click')
+    await flushPromises()
+    await wrapper.find('[data-test="client-undo-confirm-cursor"]').trigger('click')
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('changed since mcpproxy connected')
+    // The refusal does not pretend the undo happened: the backup line stays.
+    expect(wrapper.find('[data-test="client-backup-cursor"]').exists()).toBe(true)
+  })
+
+  it('does not replay undo state in a new wizard session', async () => {
+    const wrapper = await openClientsTab(pinia)
+    await connectViaPreview(wrapper, 'cursor')
+    expect(wrapper.find('[data-test="client-undo-cursor"]').exists()).toBe(true)
+
+    await wrapper.setProps({ show: false })
+    await flushPromises()
+    await wrapper.setProps({ show: true })
+    await flushPromises()
+
+    expect(wrapper.find('[data-test="client-undo-cursor"]').exists()).toBe(false)
+    expect(wrapper.find('[data-test="client-undo-panel-cursor"]').exists()).toBe(false)
+  })
+})
diff --git a/internal/connect/backup.go b/internal/connect/backup.go
index 93a25c91..00d6ba55 100644
--- a/internal/connect/backup.go
+++ b/internal/connect/backup.go
@@ -1,16 +1,28 @@
 package connect
 
 import (
+	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"time"
 )
 
+// backupNow is the clock seam for backup naming (overridden in tests to force
+// same-second collisions deterministically).
+var backupNow = time.Now
+
 // backupFile creates a timestamped backup of the given file.
 // Returns the backup path, or empty string if the source file does not exist.
 //
+// Backup names have second granularity (<config>.bak.<YYYYMMDD-HHMMSS>), so two
+// operations within one second would collide and the second would silently
+// overwrite the first — destroying the very backup a later undo needs (Spec 078
+// US3). On collision a numeric suffix is appended (-1, -2, …), keeping the
+// timestamped name as a prefix so existing backups still sort/glob together.
+//
 // All failure paths wrap their OS cause with %w, so a permission denial here
 // (e.g. macOS TCC App-Data) preserves fs.ErrPermission up the call chain and is
 // classified into a typed *AccessError by the Connect/Disconnect boundary
@@ -24,18 +36,26 @@ func backupFile(path string) (string, error) {
 		return "", fmt.Errorf("stat %s: %w", path, err)
 	}
 
-	ts := time.Now().Format("20060102-150405")
-	backupPath := fmt.Sprintf("%s.bak.%s", path, ts)
-
 	src, err := os.Open(path)
 	if err != nil {
 		return "", fmt.Errorf("open source for backup: %w", err)
 	}
 	defer src.Close()
 
-	dst, err := os.OpenFile(backupPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, info.Mode())
-	if err != nil {
-		return "", fmt.Errorf("create backup file: %w", err)
+	// Uniqueness on same-second collision: O_EXCL guarantees a fresh file, so an
+	// existing backup is never truncated even under a create/create race.
+	ts := backupNow().Format("20060102-150405")
+	backupPath := fmt.Sprintf("%s.bak.%s", path, ts)
+	var dst *os.File
+	for n := 1; ; n++ {
+		dst, err = os.OpenFile(backupPath, os.O_CREATE|os.O_EXCL|os.O_WRONLY, info.Mode())
+		if err == nil {
+			break
+		}
+		if !errors.Is(err, fs.ErrExist) {
+			return "", fmt.Errorf("create backup file: %w", err)
+		}
+		backupPath = fmt.Sprintf("%s.bak.%s-%d", path, ts, n)
 	}
 	defer dst.Close()
 
diff --git a/internal/connect/undo.go b/internal/connect/undo.go
new file mode 100644
index 00000000..6f53c1ed
--- /dev/null
+++ b/internal/connect/undo.go
@@ -0,0 +1,226 @@
+package connect
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/BurntSushi/toml"
+)
+
+// Undo reverts the connect that produced the named backup, restoring the client
+// config to its exact pre-connect state (Spec 078 US3 / FR-008). backupName is
+// the bare filename (filepath.Base) of the backup the connect returned, NOT a
+// path — undo resolves the full path itself against the client's own config
+// directory (see the resolution/validation below):
+//
+//   - backupName != "": the config is restored byte-for-byte from that backup —
+//     this is the only revert that can bring back a pre-existing same-named
+//     entry a force-connect overwrote (surgical disconnect cannot).
+//   - backupName == "": the preceding connect created the file (no prior file
+//     existed, ConnectResult.backup_path was empty); undo deletes the file so
+//     the pre-connect "no file" state is restored.
+//
+// Safety first: Undo refuses (Action "conflict") unless the CURRENT file is
+// byte-identical to what that connect produced — i.e. the backup content with
+// exactly the mcpproxy entry applied, reconstructed via the same
+// buildServerEntry/marshal path the write used. Any other content means the
+// user (or another tool) changed the file since the connect, and a restore
+// would clobber those edits. Callers should fall back to Disconnect (surgical
+// entry removal) in that case. A missing backup refuses with Action
+// "not_found". Every mutation takes its own safety backup before touching the
+// file, and a permission denial anywhere surfaces as the same typed
+// *AccessError as connect/disconnect (403 + remediation at the REST boundary).
+//
+// Note the drift check also intentionally refuses when the effective listen
+// address / API key / require_mcp_auth changed since the connect: the entry the
+// service would write today no longer matches the one on disk, so mcpproxy can
+// no longer prove the file is untouched.
+func (s *Service) Undo(clientID, serverName, backupName string) (*ConnectResult, error) {
+	client := FindClient(clientID)
+	if client == nil {
+		return nil, fmt.Errorf("unknown client: %s", clientID)
+	}
+	if !client.Supported {
+		return nil, fmt.Errorf("client %s is not supported: %s", client.Name, client.Reason)
+	}
+	if serverName == "" {
+		serverName = defaultServerName
+	}
+	cfgPath := ConfigPath(clientID, s.homeDir)
+	if cfgPath == "" {
+		return nil, fmt.Errorf("cannot determine config path for %s", clientID)
+	}
+
+	// Resolve the backup path entirely server-side: the request carries only a
+	// bare FILENAME (backupName), never a path. Undo joins it with THIS client's
+	// own config directory — derived from the client registry, never from the
+	// request — so a client-supplied value can never contribute a directory
+	// component. That makes traversal impossible by construction (undo must not
+	// become an arbitrary-file-restore primitive): we reject anything whose
+	// filepath.Base is not identical to the input, and require the strict
+	// "<config-basename>.bak." prefix the connect write produced.
+	backupPath := ""
+	if backupName != "" {
+		base := filepath.Base(backupName)
+		if base != backupName {
+			return nil, fmt.Errorf("invalid backup name %q: must be a bare filename, not a path", backupName)
+		}
+		if !strings.HasPrefix(base, filepath.Base(cfgPath)+".bak.") {
+			return nil, fmt.Errorf("invalid backup name %q: not a backup of %s", backupName, filepath.Base(cfgPath))
+		}
+		backupPath = filepath.Join(filepath.Dir(cfgPath), base)
+	}
+
+	res, err := s.undo(client, cfgPath, serverName, backupPath)
+	return res, s.asAccessError(client, cfgPath, err)
+}
+
+func (s *Service) undo(client *ClientDef, cfgPath, serverName, backupPath string) (*ConnectResult, error) {
+	// Load the pre-connect content (empty when connect created the file).
+	var backupRaw []byte
+	if backupPath != "" {
+		raw, err := s.read(backupPath)
+		if os.IsNotExist(err) {
+			return &ConnectResult{
+				Success:    false,
+				Client:     client.ID,
+				ConfigPath: cfgPath,
+				ServerName: serverName,
+				Action:     "not_found",
+				Message:    fmt.Sprintf("Backup %s no longer exists; cannot restore. Use disconnect to remove the mcpproxy entry instead.", backupPath),
+			}, nil
+		}
+		if err != nil {
+			return nil, fmt.Errorf("read backup: %w", err)
+		}
+		backupRaw = raw
+	}
+
+	// Read the CURRENT file. A vanished config means the state already diverged
+	// from "just connected" — refuse rather than resurrect files.
+	currentRaw, err := s.read(cfgPath)
+	if os.IsNotExist(err) {
+		return &ConnectResult{
+			Success:    false,
+			Client:     client.ID,
+			ConfigPath: cfgPath,
+			ServerName: serverName,
+			Action:     "conflict",
+			Message:    fmt.Sprintf("Config file %s no longer exists; nothing to undo.", cfgPath),
+		}, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("read config: %w", err)
+	}
+
+	// Drift check (FR-008 safety): reconstruct the exact bytes the connect wrote
+	// by replaying the same transformation on the backup content. If the current
+	// file differs, someone edited it since — refuse instead of clobbering.
+	expected, err := s.replayConnectWrite(client, serverName, backupRaw)
+	if err != nil {
+		return nil, err
+	}
+	if !bytes.Equal(currentRaw, expected) {
+		return &ConnectResult{
+			Success:    false,
+			Client:     client.ID,
+			ConfigPath: cfgPath,
+			ServerName: serverName,
+			Action:     "conflict",
+			Message:    fmt.Sprintf("%s changed since mcpproxy connected; refusing to restore the backup over your edits. Use disconnect to remove just the mcpproxy entry.", cfgPath),
+		}, nil
+	}
+
+	// Safety backup of the current file before any mutation (collision-proof
+	// naming guarantees this never destroys the undo backup itself).
+	safetyPath, err := backupFile(cfgPath)
+	if err != nil {
+		return nil, fmt.Errorf("safety backup failed: %w", err)
+	}
+
+	if backupPath == "" {
+		// Connect created this file; pre-connect state is "no file".
+		if err := os.Remove(cfgPath); err != nil {
+			return nil, fmt.Errorf("remove created config: %w", err)
+		}
+		return &ConnectResult{
+			Success:    true,
+			Client:     client.ID,
+			ConfigPath: cfgPath,
+			BackupPath: safetyPath,
+			ServerName: serverName,
+			Action:     "deleted",
+			Message:    fmt.Sprintf("Removed %s — it did not exist before mcpproxy connected (a safety copy was saved to %s)", cfgPath, safetyPath),
+		}, nil
+	}
+
+	perm := os.FileMode(0o644)
+	if info, statErr := os.Stat(cfgPath); statErr == nil {
+		perm = info.Mode()
+	}
+	if err := atomicWriteFile(cfgPath, backupRaw, perm); err != nil {
+		return nil, fmt.Errorf("restore from backup: %w", err)
+	}
+
+	return &ConnectResult{
+		Success:    true,
+		Client:     client.ID,
+		ConfigPath: cfgPath,
+		BackupPath: safetyPath,
+		ServerName: serverName,
+		Action:     "restored",
+		Message:    fmt.Sprintf("Restored %s from backup %s", cfgPath, backupPath),
+	}, nil
+}
+
+// replayConnectWrite reproduces, from the pre-connect bytes, the exact file
+// content the connect wrote: parse (empty map when no prior file), apply the
+// same entry the write applies (buildServerEntry with the LIVE unmasked
+// params, including OpenCode's adopted-name normalization), and marshal with
+// the same encoder. Because Connect itself performed exactly these steps, a
+// current file that has not been touched since is byte-identical to this
+// reconstruction.
+func (s *Service) replayConnectWrite(client *ClientDef, serverName string, backupRaw []byte) ([]byte, error) {
+	data := make(map[string]interface{})
+	if client.Format == "toml" {
+		if len(backupRaw) > 0 {
+			if _, err := toml.Decode(string(backupRaw), &data); err != nil {
+				return nil, fmt.Errorf("parse backup TOML: %w", err)
+			}
+		}
+		serversMap, _ := data["mcp_servers"].(map[string]interface{})
+		if serversMap == nil {
+			serversMap = make(map[string]interface{})
+		}
+		serversMap[serverName] = buildServerEntry(client.ID, s.entryParams(false))
+		data["mcp_servers"] = serversMap
+		var buf bytes.Buffer
+		if err := toml.NewEncoder(&buf).Encode(data); err != nil {
+			return nil, fmt.Errorf("encode TOML: %w", err)
+		}
+		return buf.Bytes(), nil
+	}
+
+	if len(backupRaw) > 0 {
+		if err := unmarshalLenientJSON(backupRaw, &data); err != nil {
+			return nil, fmt.Errorf("parse backup JSON: %w", err)
+		}
+	}
+	serversMap, _ := data[client.ServerKey].(map[string]interface{})
+	if serversMap == nil {
+		serversMap = make(map[string]interface{})
+	}
+	// Mirror connectJSON's OpenCode force path: an equivalent entry under a
+	// different key was deleted and rewritten under serverName.
+	if client.ID == "opencode" {
+		if adoptedName, found := findEquivalentJSONServerName(serversMap, s.baseURL(), serverName); found && adoptedName != serverName {
+			delete(serversMap, adoptedName)
+		}
+	}
+	serversMap[serverName] = buildServerEntry(client.ID, s.entryParams(false))
+	data[client.ServerKey] = serversMap
+	return marshalJSONIndent(data)
+}
diff --git a/internal/connect/undo_test.go b/internal/connect/undo_test.go
new file mode 100644
index 00000000..7a673bef
--- /dev/null
+++ b/internal/connect/undo_test.go
@@ -0,0 +1,355 @@
+package connect
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+// Spec 078 US3: one-click undo of a connect. Undo restores the client config
+// byte-for-byte from the backup the immediately-preceding connect took, after
+// verifying the file has not drifted since (FR-008); when connect created the
+// file (no prior file), undo removes it. Every mutation takes its own safety
+// backup first.
+
+// readFileT is a test helper that fails the test on read error.
+func readFileT(t *testing.T, path string) []byte {
+	t.Helper()
+	b, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read %s: %v", path, err)
+	}
+	return b
+}
+
+func TestUndo_RestoresByteIdenticalPreConnectFile(t *testing.T) {
+	home := t.TempDir()
+	cfgPath := ConfigPath("claude-code", home)
+	if err := os.MkdirAll(filepath.Dir(cfgPath), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	// Pre-existing file with a user-owned mcpproxy entry — the overwrite case
+	// (FR-008): disconnect could NOT bring this entry back, undo must.
+	original := []byte("{\n  \"mcpServers\": {\n    \"mcpproxy\": {\n      \"type\": \"http\",\n      \"url\": \"http://users-own-server/mcp\"\n    },\n    \"other\": {\n      \"url\": \"http://x\"\n    }\n  }\n}\n")
+	if err := os.WriteFile(cfgPath, original, 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("claude-code", "mcpproxy", true) // force overwrite
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	if !res.Success || res.BackupPath == "" {
+		t.Fatalf("connect result unexpected: %+v", res)
+	}
+
+	undo, err := svc.Undo("claude-code", "mcpproxy", filepath.Base(res.BackupPath))
+	if err != nil {
+		t.Fatalf("undo: %v", err)
+	}
+	if !undo.Success {
+		t.Fatalf("undo failed: %+v", undo)
+	}
+	if undo.Action != "restored" {
+		t.Fatalf("action = %q, want restored", undo.Action)
+	}
+	if undo.BackupPath == "" {
+		t.Fatal("undo must take its own safety backup")
+	}
+	if _, err := os.Stat(undo.BackupPath); err != nil {
+		t.Fatalf("safety backup missing: %v", err)
+	}
+
+	after := readFileT(t, cfgPath)
+	if string(after) != string(original) {
+		t.Fatalf("file not byte-identical to pre-connect state:\n got: %q\nwant: %q", after, original)
+	}
+}
+
+func TestUndo_TOML_RestoresByteIdentical(t *testing.T) {
+	home := t.TempDir()
+	cfgPath := ConfigPath("codex", home)
+	if err := os.MkdirAll(filepath.Dir(cfgPath), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	original := []byte("model = \"o4\"\n\n[mcp_servers.other]\nurl = \"http://x\"\n")
+	if err := os.WriteFile(cfgPath, original, 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("codex", "mcpproxy", false)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	if !res.Success || res.BackupPath == "" {
+		t.Fatalf("connect result unexpected: %+v", res)
+	}
+
+	undo, err := svc.Undo("codex", "mcpproxy", filepath.Base(res.BackupPath))
+	if err != nil {
+		t.Fatalf("undo: %v", err)
+	}
+	if !undo.Success || undo.Action != "restored" {
+		t.Fatalf("undo result unexpected: %+v", undo)
+	}
+	after := readFileT(t, cfgPath)
+	if string(after) != string(original) {
+		t.Fatalf("TOML file not byte-identical:\n got: %q\nwant: %q", after, original)
+	}
+}
+
+func TestUndo_RefusesWhenFileDriftedSinceConnect(t *testing.T) {
+	home := t.TempDir()
+	cfgPath := ConfigPath("claude-code", home)
+	if err := os.MkdirAll(filepath.Dir(cfgPath), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(cfgPath, []byte(`{"mcpServers":{"other":{"url":"http://x"}}}`), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+
+	// The user (or another tool) edits the file after the connect.
+	drifted := []byte(`{"mcpServers":{"other":{"url":"http://x"},"mcpproxy":{"type":"http","url":"http://127.0.0.1:8080/mcp"},"added-later":{"url":"http://y"}}}`)
+	if err := os.WriteFile(cfgPath, drifted, 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	undo, err := svc.Undo("claude-code", "mcpproxy", filepath.Base(res.BackupPath))
+	if err != nil {
+		t.Fatalf("undo returned hard error, want refusal result: %v", err)
+	}
+	if undo.Success {
+		t.Fatalf("undo must refuse on drift: %+v", undo)
+	}
+	if undo.Action != "conflict" {
+		t.Fatalf("action = %q, want conflict", undo.Action)
+	}
+	// The drifted file must be left untouched (no clobber).
+	after := readFileT(t, cfgPath)
+	if string(after) != string(drifted) {
+		t.Fatalf("drifted file was modified by a refused undo")
+	}
+}
+
+func TestUndo_NoPriorFile_RemovesCreatedFile(t *testing.T) {
+	home := t.TempDir()
+	cfgPath := ConfigPath("claude-code", home)
+
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	if res.BackupPath != "" {
+		t.Fatalf("expected no backup for a created file, got %q", res.BackupPath)
+	}
+	if _, err := os.Stat(cfgPath); err != nil {
+		t.Fatalf("connect should have created %s: %v", cfgPath, err)
+	}
+
+	undo, err := svc.Undo("claude-code", "mcpproxy", "")
+	if err != nil {
+		t.Fatalf("undo: %v", err)
+	}
+	if !undo.Success {
+		t.Fatalf("undo failed: %+v", undo)
+	}
+	if undo.Action != "deleted" {
+		t.Fatalf("action = %q, want deleted", undo.Action)
+	}
+	if _, err := os.Stat(cfgPath); !os.IsNotExist(err) {
+		t.Fatalf("config file should be gone (pre-connect state), stat err = %v", err)
+	}
+	// Even the delete takes a safety backup so the user can recover.
+	if undo.BackupPath == "" {
+		t.Fatal("undo delete must take a safety backup")
+	}
+	if _, err := os.Stat(undo.BackupPath); err != nil {
+		t.Fatalf("safety backup missing: %v", err)
+	}
+}
+
+func TestUndo_NoPriorFile_RefusesWhenFileDrifted(t *testing.T) {
+	home := t.TempDir()
+	cfgPath := ConfigPath("claude-code", home)
+
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	if _, err := svc.Connect("claude-code", "mcpproxy", false); err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	// User adds their own server to the file mcpproxy created: deleting the
+	// whole file would now lose their work — undo must refuse.
+	drifted := []byte(`{"mcpServers":{"mcpproxy":{"type":"http","url":"http://127.0.0.1:8080/mcp"},"mine":{"url":"http://y"}}}`)
+	if err := os.WriteFile(cfgPath, drifted, 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	undo, err := svc.Undo("claude-code", "mcpproxy", "")
+	if err != nil {
+		t.Fatalf("undo: %v", err)
+	}
+	if undo.Success || undo.Action != "conflict" {
+		t.Fatalf("undo must refuse: %+v", undo)
+	}
+	if _, err := os.Stat(cfgPath); err != nil {
+		t.Fatalf("refused undo must not delete the file: %v", err)
+	}
+}
+
+func TestUndo_BackupMissingReturnsNotFound(t *testing.T) {
+	home := t.TempDir()
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	cfgPath := res.ConfigPath
+	// A well-formed but non-existent backup NAME (bare filename, correct prefix)
+	// must resolve to not_found, not a hard error.
+	missing := filepath.Base(cfgPath) + ".bak.19990101-000000"
+
+	undo, err := svc.Undo("claude-code", "mcpproxy", missing)
+	if err != nil {
+		t.Fatalf("undo: %v", err)
+	}
+	if undo.Success || undo.Action != "not_found" {
+		t.Fatalf("undo with a missing backup must report not_found: %+v", undo)
+	}
+}
+
+// The request carries a bare backup FILENAME; an absolute path must be rejected
+// outright — undo must not become an arbitrary-file-restore primitive, and the
+// directory is always the client's own config dir, never the caller's.
+func TestUndo_RejectsAbsoluteBackupPath(t *testing.T) {
+	home := t.TempDir()
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	if _, err := svc.Connect("claude-code", "mcpproxy", false); err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+
+	// An absolute path is not a bare filename (filepath.Base != input).
+	foreign := filepath.Join(home, "evil.json")
+	if err := os.WriteFile(foreign, []byte(`{}`), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	_, err := svc.Undo("claude-code", "mcpproxy", foreign)
+	if err == nil {
+		t.Fatal("undo must reject an absolute backup path")
+	}
+	if !strings.Contains(err.Error(), "backup") {
+		t.Fatalf("error should mention the backup name problem: %v", err)
+	}
+}
+
+// A backup name that carries any directory separator or traversal component
+// (e.g. "<config>.bak.x/../../secret.json") must be rejected before any read:
+// resolution joins the name with the client's own config dir, so only a bare
+// filename is ever admitted (traversal impossible by construction).
+func TestUndo_RejectsBackupNameWithSeparators(t *testing.T) {
+	home := t.TempDir()
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+
+	// Keep the "<config>.bak." prefix but climb out via separators — a prefix-
+	// only guard would admit it; the bare-filename guard must not.
+	secret := filepath.Join(home, "secret.json")
+	if err := os.WriteFile(secret, []byte(`{"secret":true}`), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	rel, err := filepath.Rel(filepath.Dir(res.ConfigPath), secret)
+	if err != nil {
+		t.Fatal(err)
+	}
+	traversal := filepath.Base(res.ConfigPath) + ".bak.x/../" + rel
+
+	_, err = svc.Undo("claude-code", "mcpproxy", traversal)
+	if err == nil {
+		t.Fatal("undo must reject a backup name that contains path separators")
+	}
+	if !strings.Contains(err.Error(), "backup") {
+		t.Fatalf("error should mention the backup name problem: %v", err)
+	}
+}
+
+func TestUndo_MissingConfigFileRefuses(t *testing.T) {
+	home := t.TempDir()
+	svc := NewServiceWithHome("127.0.0.1:8080", "", home)
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	if err := os.Remove(res.ConfigPath); err != nil {
+		t.Fatal(err)
+	}
+
+	// No prior file existed, so the connect returned an empty backup name.
+	undo, err := svc.Undo("claude-code", "mcpproxy", "")
+	if err != nil {
+		t.Fatalf("undo: %v", err)
+	}
+	if undo.Success || undo.Action != "conflict" {
+		t.Fatalf("undo on a since-deleted config must refuse: %+v", undo)
+	}
+}
+
+// Spec 078 undo reliability: two backups of the same file within the same
+// second must yield two distinct backup files (previously the second overwrote
+// the first, which could destroy the very backup an undo needs).
+func TestBackupFile_SameSecondCollisionYieldsDistinctFiles(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "config.json")
+	if err := os.WriteFile(path, []byte(`{"v":1}`), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	// Pin the clock so both backups land in the SAME second deterministically.
+	fixed := time.Date(2026, 7, 2, 10, 15, 30, 0, time.UTC)
+	orig := backupNow
+	backupNow = func() time.Time { return fixed }
+	t.Cleanup(func() { backupNow = orig })
+
+	first, err := backupFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Mutate the source so an overwrite would be detectable by content.
+	if err := os.WriteFile(path, []byte(`{"v":2}`), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	second, err := backupFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if first == second {
+		t.Fatalf("same-second backups collided: %s", first)
+	}
+	// Both must exist with their original contents.
+	if got := string(readFileT(t, first)); got != `{"v":1}` {
+		t.Fatalf("first backup content = %q", got)
+	}
+	if got := string(readFileT(t, second)); got != `{"v":2}` {
+		t.Fatalf("second backup content = %q", got)
+	}
+	// The collision suffix must keep the timestamped name as a prefix so old
+	// backups still sort/glob together.
+	base := filepath.Base(path)
+	for _, b := range []string{first, second} {
+		if !strings.HasPrefix(filepath.Base(b), base+".bak.") {
+			t.Fatalf("backup %q must keep the <config>.bak.<ts> shape", b)
+		}
+	}
+}
diff --git a/internal/httpapi/connect.go b/internal/httpapi/connect.go
index 78a09991..231e7257 100644
--- a/internal/httpapi/connect.go
+++ b/internal/httpapi/connect.go
@@ -255,6 +255,98 @@ func (s *Server) handleDisconnectClient(w http.ResponseWriter, r *http.Request)
 	s.writeSuccess(w, result)
 }
 
+// UndoConnectRequest is the JSON body for POST /api/v1/connect/{client}/undo.
+type UndoConnectRequest struct {
+	ServerName string `json:"server_name,omitempty"` // Defaults to "mcpproxy"
+	// BackupName is the bare filename (filepath.Base) of the backup returned as
+	// backup_path by the preceding connect — a name, never a path. Undo resolves
+	// the full path server-side by joining it with the client's own config
+	// directory, so a client-supplied value can never contribute a directory
+	// component (traversal is impossible by construction). Empty means the
+	// connect created the file (no prior file existed), so undo removes it.
+	BackupName string `json:"backup_name,omitempty"`
+}
+
+// handleUndoConnectClient godoc
+// @Summary     Undo a connect, restoring the pre-connect config
+// @Description Reverts the connect that produced the named backup (Spec 078 US3):
+// @Description restores the client config byte-for-byte from that backup, or — when
+// @Description backup_name is empty because the connect created the file — deletes the
+// @Description created file. backup_name is the bare filename of the backup the connect
+// @Description returned (never a path); undo resolves the full path server-side inside
+// @Description the client's own config directory, so a client value cannot escape it.
+// @Description Refuses with 409 when the config changed since the connect (undo never
+// @Description clobbers later edits; use DELETE /connect/{client} for a surgical entry
+// @Description removal instead). Takes its own safety backup first; its path is returned
+// @Description as backup_path in the result.
+// @Tags        connect
+// @Accept      json
+// @Produce     json
+// @Security    ApiKeyAuth
+// @Security    ApiKeyQuery
+// @Param       client path   string             true  "Client ID (claude-code, claude-desktop, cursor, windsurf, vscode, codex, gemini, opencode)"
+// @Param       body   body   UndoConnectRequest false "Undo parameters (server_name, backup_name = the bare filename of the backup the preceding connect returned)"
+// @Success     200    {object} contracts.APIResponse "ConnectResult (action restored|deleted)"
+// @Failure     400    {object} contracts.ErrorResponse "Bad request (e.g. backup_name is a path, or not a backup of this client's config)"
+// @Failure     403    {object} contracts.ErrorResponse "Permission denied (macOS App-Data block)"
+// @Failure     404    {object} contracts.ErrorResponse "Unknown client or backup no longer exists"
+// @Failure     409    {object} contracts.ErrorResponse "Config changed since connect; undo refused"
+// @Failure     503    {object} contracts.ErrorResponse "Service unavailable"
+// @Router      /api/v1/connect/{client}/undo [post]
+func (s *Server) handleUndoConnectClient(w http.ResponseWriter, r *http.Request) {
+	svc := s.getConnectService()
+	if svc == nil {
+		s.writeError(w, r, http.StatusServiceUnavailable, "connect service not available")
+		return
+	}
+
+	clientID := chi.URLParam(r, "client")
+	if clientID == "" {
+		s.writeError(w, r, http.StatusBadRequest, "client ID is required")
+		return
+	}
+
+	var req UndoConnectRequest
+	if r.Body != nil && r.ContentLength > 0 {
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			s.writeError(w, r, http.StatusBadRequest, fmt.Sprintf("invalid request body: %v", err))
+			return
+		}
+	}
+
+	result, err := svc.Undo(clientID, req.ServerName, req.BackupName)
+	if err != nil {
+		if s.writeIfAccessDenied(w, r, err) {
+			return
+		}
+		if connect.FindClient(clientID) == nil {
+			s.writeError(w, r, http.StatusNotFound, err.Error())
+			return
+		}
+		s.writeError(w, r, http.StatusBadRequest, err.Error())
+		return
+	}
+
+	if !result.Success {
+		switch result.Action {
+		case "not_found":
+			s.writeError(w, r, http.StatusNotFound, result.Message)
+			return
+		case "conflict":
+			// Mirror the connect already_exists shape: the typed result rides
+			// along so the UI can distinguish the refusal from a hard failure.
+			s.writeJSON(w, http.StatusConflict, map[string]interface{}{
+				"success": false,
+				"data":    result,
+				"error":   result.Message,
+			})
+			return
+		}
+	}
+
+	s.writeSuccess(w, result)
+}
+
 // writeIfAccessDenied maps a permission-denied client-config access to a 403
 // response whose body carries the remediation text. It returns true when it
 // handled the error (a typed *connect.AccessError), so callers can stop. This
diff --git a/internal/httpapi/connect_test.go b/internal/httpapi/connect_test.go
index 64807597..1a8bd4ba 100644
--- a/internal/httpapi/connect_test.go
+++ b/internal/httpapi/connect_test.go
@@ -403,3 +403,231 @@ func TestHandleConnectClientPreview_DeniedReturns403(t *testing.T) {
 	assert.False(t, resp.Success)
 	assert.Contains(t, resp.Error, "tccutil reset SystemPolicyAppData")
 }
+
+// ---- Spec 078 US3: POST /api/v1/connect/{client}/undo ----
+
+// TestHandleUndoConnectClient_RestoresFile exercises the happy path end-to-end:
+// connect (force-overwriting a user entry), then undo with the backup_path the
+// connect returned — the config must come back byte-identical.
+func TestHandleUndoConnectClient_RestoresFile(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	home := t.TempDir()
+	svc := connect.NewServiceWithHome("127.0.0.1:8080", "", home)
+	srv.SetConnectService(svc)
+
+	cfgPath := connect.ConfigPath("claude-code", home)
+	require.NoError(t, os.MkdirAll(filepath.Dir(cfgPath), 0o755))
+	original := []byte(`{"mcpServers":{"mcpproxy":{"url":"http://user-owned/mcp"}}}`)
+	require.NoError(t, os.WriteFile(cfgPath, original, 0o644))
+
+	res, err := svc.Connect("claude-code", "mcpproxy", true)
+	require.NoError(t, err)
+	require.NotEmpty(t, res.BackupPath)
+
+	body, _ := json.Marshal(UndoConnectRequest{ServerName: "mcpproxy", BackupName: filepath.Base(res.BackupPath)})
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/claude-code/undo", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	var resp struct {
+		Success bool                  `json:"success"`
+		Data    connect.ConnectResult `json:"data"`
+	}
+	require.NoError(t, json.NewDecoder(w.Body).Decode(&resp))
+	assert.True(t, resp.Success)
+	assert.Equal(t, "restored", resp.Data.Action)
+	assert.NotEmpty(t, resp.Data.BackupPath, "undo must report its safety backup")
+
+	after, err := os.ReadFile(cfgPath)
+	require.NoError(t, err)
+	assert.Equal(t, string(original), string(after), "config must be byte-identical to pre-connect state")
+}
+
+// TestHandleUndoConnectClient_ConflictWhenDrifted asserts a 409 (and no file
+// mutation) when the config changed after the connect.
+func TestHandleUndoConnectClient_ConflictWhenDrifted(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	home := t.TempDir()
+	svc := connect.NewServiceWithHome("127.0.0.1:8080", "", home)
+	srv.SetConnectService(svc)
+
+	// Pre-write a config so the connect produces a real (non-empty) backup — the
+	// realistic restore-drift path.
+	cfgPath := connect.ConfigPath("claude-code", home)
+	require.NoError(t, os.MkdirAll(filepath.Dir(cfgPath), 0o755))
+	require.NoError(t, os.WriteFile(cfgPath, []byte(`{"mcpServers":{"other":{"url":"http://x"}}}`), 0o644))
+
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	require.NoError(t, err)
+	require.NotEmpty(t, res.BackupPath)
+	drifted := []byte(`{"mcpServers":{"mcpproxy":{"type":"http","url":"http://127.0.0.1:8080/mcp"},"mine":{"url":"http://y"}}}`)
+	require.NoError(t, os.WriteFile(cfgPath, drifted, 0o644))
+
+	body, _ := json.Marshal(UndoConnectRequest{ServerName: "mcpproxy", BackupName: filepath.Base(res.BackupPath)})
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/claude-code/undo", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusConflict, w.Code)
+	var resp struct {
+		Success bool                  `json:"success"`
+		Data    connect.ConnectResult `json:"data"`
+		Error   string                `json:"error"`
+	}
+	require.NoError(t, json.NewDecoder(w.Body).Decode(&resp))
+	assert.False(t, resp.Success)
+	assert.Equal(t, "conflict", resp.Data.Action)
+	assert.NotEmpty(t, resp.Error)
+
+	after, err := os.ReadFile(cfgPath)
+	require.NoError(t, err)
+	assert.Equal(t, string(drifted), string(after), "refused undo must not touch the file")
+}
+
+// TestHandleUndoConnectClient_MissingBackupReturns404 asserts a vanished backup
+// maps to 404 like the other not_found results.
+func TestHandleUndoConnectClient_MissingBackupReturns404(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	home := t.TempDir()
+	svc := connect.NewServiceWithHome("127.0.0.1:8080", "", home)
+	srv.SetConnectService(svc)
+
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	require.NoError(t, err)
+
+	body, _ := json.Marshal(UndoConnectRequest{BackupName: filepath.Base(res.ConfigPath) + ".bak.19990101-000000"})
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/claude-code/undo", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusNotFound, w.Code)
+}
+
+// TestHandleUndoConnectClient_RejectsPathBackupName asserts a backup_name that
+// carries a directory component (traversal attempt) is rejected with 400 before
+// any file is touched — undo resolves the path server-side from a bare name.
+func TestHandleUndoConnectClient_RejectsPathBackupName(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	home := t.TempDir()
+	svc := connect.NewServiceWithHome("127.0.0.1:8080", "", home)
+	srv.SetConnectService(svc)
+
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	require.NoError(t, err)
+
+	// A name that keeps the ".bak." prefix but escapes the config dir.
+	body, _ := json.Marshal(UndoConnectRequest{
+		BackupName: filepath.Base(res.ConfigPath) + ".bak.x/../../secret.json",
+	})
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/claude-code/undo", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusBadRequest, w.Code)
+	var resp struct {
+		Success bool   `json:"success"`
+		Error   string `json:"error"`
+	}
+	require.NoError(t, json.NewDecoder(w.Body).Decode(&resp))
+	assert.False(t, resp.Success)
+	assert.Contains(t, resp.Error, "backup name")
+}
+
+// TestHandleUndoConnectClient_DeniedReturns403 mirrors the other per-client
+// connect routes: a macOS App-Data (TCC) denial surfaces as 403 + remediation.
+func TestHandleUndoConnectClient_DeniedReturns403(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	home := t.TempDir()
+
+	cfgPath := connect.ConfigPath("claude-code", home)
+	require.NoError(t, os.MkdirAll(filepath.Dir(cfgPath), 0o755))
+	require.NoError(t, os.WriteFile(cfgPath, []byte(`{}`), 0o644))
+	require.NoError(t, os.WriteFile(cfgPath+".bak.20260702-000000", []byte(`{}`), 0o644))
+
+	svc := connect.NewServiceWithReader("127.0.0.1:8080", "", home, denyingReader)
+	srv.SetConnectService(svc)
+
+	body, _ := json.Marshal(UndoConnectRequest{BackupName: filepath.Base(cfgPath) + ".bak.20260702-000000"})
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/claude-code/undo", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusForbidden, w.Code)
+	var resp struct {
+		Success bool   `json:"success"`
+		Error   string `json:"error"`
+	}
+	require.NoError(t, json.NewDecoder(w.Body).Decode(&resp))
+	assert.False(t, resp.Success)
+	assert.Contains(t, resp.Error, "tccutil reset SystemPolicyAppData")
+}
+
+// TestHandleUndoConnectClient_UnknownClient yields 404, not a 200/empty body.
+func TestHandleUndoConnectClient_UnknownClient(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	srv.SetConnectService(connect.NewServiceWithHome("127.0.0.1:8080", "", t.TempDir()))
+
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/not-a-real-client/undo", bytes.NewReader([]byte(`{}`)))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusNotFound, w.Code)
+}
+
+// TestHandleUndoConnectClient_NoPriorFileDeletes covers the created-file case:
+// undo with an empty backup_path removes the file connect created.
+func TestHandleUndoConnectClient_NoPriorFileDeletes(t *testing.T) {
+	logger := zap.NewNop().Sugar()
+	mockCtrl := &mockRoutingController{apiKey: "test-key", routingMode: "retrieve_tools"}
+	srv := NewServer(mockCtrl, logger, nil)
+	home := t.TempDir()
+	svc := connect.NewServiceWithHome("127.0.0.1:8080", "", home)
+	srv.SetConnectService(svc)
+
+	res, err := svc.Connect("claude-code", "mcpproxy", false)
+	require.NoError(t, err)
+	require.Empty(t, res.BackupPath, "no prior file: connect returns no backup")
+
+	body, _ := json.Marshal(UndoConnectRequest{ServerName: "mcpproxy", BackupName: ""})
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/connect/claude-code/undo", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-API-Key", "test-key")
+	w := httptest.NewRecorder()
+	srv.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusOK, w.Code)
+	var resp struct {
+		Success bool                  `json:"success"`
+		Data    connect.ConnectResult `json:"data"`
+	}
+	require.NoError(t, json.NewDecoder(w.Body).Decode(&resp))
+	assert.True(t, resp.Success)
+	assert.Equal(t, "deleted", resp.Data.Action)
+	_, statErr := os.Stat(res.ConfigPath)
+	assert.True(t, os.IsNotExist(statErr), "config created by connect must be removed")
+}
diff --git a/internal/httpapi/server.go b/internal/httpapi/server.go
index 53b909f8..75ae9725 100644
--- a/internal/httpapi/server.go
+++ b/internal/httpapi/server.go
@@ -773,6 +773,7 @@ func (s *Server) setupRoutes() {
 		r.Get("/connect/{client}", s.handleGetConnectClientStatus)
 		r.Get("/connect/{client}/preview", s.handleConnectClientPreview)
 		r.Post("/connect/{client}", s.handleConnectClient)
+		r.Post("/connect/{client}/undo", s.handleUndoConnectClient)
 		r.Delete("/connect/{client}", s.handleDisconnectClient)
 
 		// Onboarding wizard (Spec 046)
diff --git a/oas/docs.go b/oas/docs.go
index e694c0d8..3ec32009 100644
--- a/oas/docs.go
+++ b/oas/docs.go
@@ -6,10 +6,10 @@ import "github.com/swaggo/swag/v2"
 
 const docTemplate = `{
     "schemes": {{ marshal .Schemes }},
-    "components": {"schemas":{"config.Config":{"properties":{"activity_cleanup_interval_min":{"description":"Background cleanup interval in minutes (default: 60)","type":"integer"},"activity_max_records":{"description":"Max records before pruning (default: 100000)","type":"integer"},"activity_max_response_size":{"description":"Response truncation limit in bytes (default: 65536)","type":"integer"},"activity_max_size_mb":{"description":"Max total activity-log size in MB before pruning oldest (default: 256, 0=disabled)","type":"integer"},"activity_retention_days":{"description":"Activity logging settings (RFC-003)","type":"integer"},"allow_private_registry_fetch":{"description":"AllowPrivateRegistryFetch opts out of the registry SSRF guard (MCP-1076,\nCWE-918). By default (false) registry fetches refuse any host that is — or\nresolves to — a non-routable address (loopback, RFC1918/CGNAT private,\nlink-local incl. the 169.254.169.254 cloud-metadata endpoint), so a\nmalicious or typo'd registry source cannot turn the daemon into a\nrequest-forgery vector against internal services.\n\nThis opt-out is BLANKET (all-or-nothing): setting it true disables the\nguard for EVERY non-routable range at once — loopback, RFC1918/CGNAT\nprivate, link-local AND the 169.254.169.254 cloud-metadata endpoint. There\nis no way to allow only loopback; enabling it for a localhost dev registry\nalso re-opens the cloud-metadata SSRF vector. Set true ONLY when you\nintentionally run a trusted registry mirror on an internal/private address,\nideally on a host with no cloud-metadata exposure. The change takes effect\nonly on daemon (re)start or config reload.","type":"boolean"},"allow_server_add":{"type":"boolean"},"allow_server_remove":{"type":"boolean"},"api_key":{"description":"Security settings","type":"string"},"call_tool_timeout":{"type":"string"},"check_server_repo":{"description":"Repository detection settings","type":"boolean"},"code_execution_max_tool_calls":{"description":"Max tool calls per execution (0 = unlimited, default: 0)","type":"integer"},"code_execution_pool_size":{"description":"JavaScript runtime pool size (default: 10)","type":"integer"},"code_execution_timeout_ms":{"description":"Timeout in milliseconds (default: 120000, max: 600000)","type":"integer"},"data_dir":{"type":"string"},"debug_search":{"type":"boolean"},"disable_management":{"type":"boolean"},"docker_isolation":{"$ref":"#/components/schemas/config.DockerIsolationConfig"},"docker_recovery":{"$ref":"#/components/schemas/config.DockerRecoveryConfig"},"enable_code_execution":{"description":"Code execution settings","type":"boolean"},"enable_prompts":{"description":"Prompts settings","type":"boolean"},"enable_socket":{"description":"Enable Unix socket/named pipe for local IPC (default: true)","type":"boolean"},"enable_tray":{"description":"Deprecated: EnableTray is unused and has no runtime effect. Kept for backward compatibility.","type":"boolean"},"environment":{"$ref":"#/components/schemas/secureenv.EnvConfig"},"features":{"$ref":"#/components/schemas/config.FeatureFlags"},"forward_proxy_env":{"description":"ForwardProxyEnv opts in to forwarding the ambient HTTP(S)/ALL/NO/FTP proxy\nenvironment variables to spawned stdio upstream servers (MCP-2769). OFF by\ndefault: proxy URLs commonly embed credentials (http://user:pass@proxy), so\nforwarding them to every upstream is a credential-leak risk. When enabled,\nvalues are forwarded with their userinfo (credentials) redacted.","type":"boolean"},"health_check_interval":{"description":"Discovery \u0026 health-check cadence (spec 074, #608). Both are *Duration\ntri-state pointers: nil = inherit the built-in default; a pointer to 0s =\nthe loop is disabled; a positive value = that interval. Defaults live only\nin the resolvers (ResolveHealthCheckInterval / ResolveToolDiscoveryInterval)\nso an unset key behaves exactly as before this feature (SC-005). Validated\nin Validate(): health-check ∈ {0} ∪ [5s,1h]; tool-discovery ∈ {0} ∪ [30s,24h].","type":"string"},"init_timeout":{"description":"InitTimeout is the global default deadline for an upstream's MCP\n` + "`" + `initialize` + "`" + ` handshake (MCP-3322 / GH #760). *Duration tri-state: nil =\ninherit the built-in 30s default; a positive value = that deadline. A\nper-server InitTimeout overrides this. Resolved by ResolveInitTimeout;\nvalidated to {0} ∪ [1s, 30m] in Validate(). Servers doing legitimate\nfirst-run warmup (cache/index build) before answering ` + "`" + `initialize` + "`" + ` can\nraise this so they are not killed mid-startup.","type":"string"},"instructions":{"description":"Instructions text returned in the MCP initialize response to guide AI agents.\nWhen empty, a built-in default is used that explains retrieve_tools workflow.","type":"string"},"intent_declaration":{"$ref":"#/components/schemas/config.IntentDeclarationConfig"},"listen":{"type":"string"},"logging":{"$ref":"#/components/schemas/config.LogConfig"},"max_result_size_chars":{"description":"Advertised on every tool as ` + "`" + `_meta.anthropic/maxResultSizeChars` + "`" + `; raises Claude Code's inline-response ceiling from 50k to up to 500k chars. Set to 0 to disable.","type":"integer"},"mcpServers":{"items":{"$ref":"#/components/schemas/config.ServerConfig"},"type":"array","uniqueItems":false},"oauth_expiry_warning_hours":{"description":"Health status settings","type":"number"},"observability":{"$ref":"#/components/schemas/config.ObservabilityConfig"},"output_sanitisation":{"$ref":"#/components/schemas/config.OutputSanitisationConfig"},"output_validation":{"$ref":"#/components/schemas/config.OutputValidationConfig"},"profiles":{"description":"Profiles are optional named, server-scoped views exposed at /mcp/p/\u003cname\u003e\n(Spec 057). Absent/empty is fully supported — /mcp is unchanged and configs\nwithout this key serialize byte-identically (SC-004).","items":{"$ref":"#/components/schemas/config.ProfileConfig"},"type":"array","uniqueItems":false},"quarantine_enabled":{"description":"QuarantineEnabled controls whether quarantine is active. It gates two\nthings together:\n  1. Server-level auto-quarantine for newly added servers (issue #370).\n     When true, servers added via the upstream_servers MCP tool or the\n     REST API default to quarantined=true; when false, they default to\n     quarantined=false. Explicit per-request values always win.\n  2. Tool-level quarantine (Spec 032): per-tool SHA-256 approval of\n     tool descriptions/schemas.\nWhen nil (default), quarantine is enabled (secure by default). Set to\nexplicit false to opt out of both. Per-server SkipQuarantine still\napplies for the tool-level check on individual servers.","type":"boolean"},"read_only_mode":{"type":"boolean"},"registries":{"description":"Registries configuration for MCP server discovery","items":{"$ref":"#/components/schemas/config.RegistryEntry"},"type":"array","uniqueItems":false},"registries_locked":{"description":"RegistriesLocked is an enterprise stub knob (MCP-866): when true, runtime\nadditions of custom registries (e.g. ` + "`" + `registry add-source` + "`" + `, the REST/MCP\nadd-source surface) are rejected so an administrator can pin the discovery\nsources. Built-in defaults are unaffected. Documented but otherwise inert\nbeyond the add-source rejection.","type":"boolean"},"require_mcp_auth":{"description":"Require authentication on /mcp endpoint (default: false)","type":"boolean"},"reveal_secret_headers":{"description":"RevealSecretHeaders, when true, disables the redaction of sensitive\nheader values (Authorization, X-API-Key, Cookie, …) in responses\nfrom the ` + "`" + `upstream_servers` + "`" + ` MCP tool, the ` + "`" + `/api/v1/servers` + "`" + ` REST\nAPI, and the SSE event stream.\n\nDefault false — sensitive header values are surfaced as\n` + "`" + `***REDACTED***` + "`" + ` so an MCP agent cannot read Bearer tokens / API\nkeys out of another upstream's config (PR #425).\n\nThe Web UI / macOS tray edit forms work without seeing the real\nvalues: PATCH /api/v1/servers/{id} deep-merges (omitted keys are\npreserved, see ` + "`" + `headers_remove` + "`" + ` / ` + "`" + `env_remove` + "`" + ` for explicit\ndeletes), so clients compute a diff and only send the keys that\nactually changed. Redacted-but-unchanged values never round-trip\n— the backend keeps the real string. Set this to true if a\ndownstream tool genuinely needs raw values in the response.","type":"boolean"},"routing_mode":{"description":"Routing mode (Spec 031): how MCP tools are exposed to clients\nValid values: \"retrieve_tools\" (default), \"direct\", \"code_execution\"","type":"string"},"security":{"$ref":"#/components/schemas/config.SecurityConfig"},"sensitive_data_detection":{"$ref":"#/components/schemas/config.SensitiveDataDetectionConfig"},"telemetry":{"$ref":"#/components/schemas/config.TelemetryConfig"},"tls":{"$ref":"#/components/schemas/config.TLSConfig"},"tokenizer":{"$ref":"#/components/schemas/config.TokenizerConfig"},"tool_discovery_interval":{"type":"string"},"tool_response_limit":{"type":"integer"},"tool_response_session_risk_warning":{"description":"ToolResponseSessionRiskWarning controls whether the prose ` + "`" + `warning` + "`" + ` field\nis included in the ` + "`" + `session_risk` + "`" + ` object returned by ` + "`" + `retrieve_tools` + "`" + `.\nThe structured fields (level, lethal_trifecta, has_open_world_tools, etc.)\nare always included. Default: false (quiet for LLM clients) — see issue #406.\nMost tools lack annotations, so the MCP-spec defaults treat them as fully\npermissive across all three risk axes, which makes the prose warning fire\non almost every call and wastes tokens.","type":"boolean"},"tools_limit":{"type":"integer"},"top_k":{"description":"Deprecated: TopK is superseded by ToolsLimit and has no runtime effect. Kept for backward compatibility.","type":"integer"},"tray_endpoint":{"description":"Tray endpoint override (unix:// or npipe://)","type":"string"},"update_check":{"$ref":"#/components/schemas/config.UpdateCheckConfig"}},"type":"object"},"config.CustomPattern":{"properties":{"category":{"description":"Category (defaults to \"custom\")","type":"string"},"keywords":{"description":"Keywords to match (mutually exclusive with Regex)","items":{"type":"string"},"type":"array","uniqueItems":false},"name":{"description":"Unique identifier for this pattern","type":"string"},"regex":{"description":"Regex pattern (mutually exclusive with Keywords)","type":"string"},"severity":{"description":"Risk level: critical, high, medium, low","type":"string"}},"type":"object"},"config.DeepScanConfig":{"description":"DeepScan is the opt-in \"deep scan\" layer (Spec 077 US3). It subsumes the\ndeprecated top-level scanner_fetch_package_source / scanner_disable_no_new_privileges\nkeys (migrated on load) and gates the heavy Docker-based scanners + source\nextraction. Disabled by default (FR-006): only the deterministic in-process\nbaseline scanner runs. A deep-scan failure NEVER changes the baseline verdict\n(FR-007/FR-008).","properties":{"disable_no_new_privileges":{"description":"DisableNoNewPrivileges, when true, omits the ` + "`" + `--security-opt\nno-new-privileges` + "`" + ` flag from scanner container runs (snap-docker/AppArmor\nescape hatch). Absorbs the deprecated top-level\nscanner_disable_no_new_privileges. Default false.","type":"boolean"},"enabled":{"description":"Enabled is the master opt-in for the heavy layer (FR-006). Default false.","type":"boolean"},"fetch_package_source":{"description":"FetchPackageSource controls whether the scanner fetches the PUBLISHED\nsource of package-runner servers (npx/uvx) — without executing it — when\nno local source is available. Absorbs the deprecated top-level\nscanner_fetch_package_source. Default (nil) is ENABLED within deep scan.","type":"boolean"},"scanners":{"description":"Scanners optionally restricts which deep scanners may run under the\numbrella (by scanner id). Empty ⇒ all enabled deep scanners are eligible.","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.DockerIsolationConfig":{"description":"Docker isolation settings","properties":{"cpu_limit":{"description":"CPU limit for containers","type":"string"},"default_images":{"additionalProperties":{"type":"string"},"description":"Map of runtime type to Docker image","type":"object"},"enable_cache_volume":{"description":"Mount shared cache volumes for faster restarts (default: true)","type":"boolean"},"enabled":{"description":"Global enable/disable for Docker isolation (legacy; superseded by Mode)","type":"boolean"},"extra_args":{"description":"Additional docker run arguments","items":{"type":"string"},"type":"array","uniqueItems":false},"log_driver":{"description":"Docker log driver (default: json-file)","type":"string"},"log_max_files":{"description":"Maximum number of log files (default: 3)","type":"string"},"log_max_size":{"description":"Maximum size of log files (default: 100m)","type":"string"},"memory_limit":{"description":"Memory limit for containers","type":"string"},"mode":{"description":"Isolation mode: \"docker\" | \"sandbox\" | \"none\" (MCP-34.2). Unset per-server inherits the global mode; unset globally falls back to the legacy \"enabled\" flag (true ⇒ docker, false ⇒ none)","type":"string","x-enum-varnames":["IsolationModeDocker","IsolationModeSandbox","IsolationModeNone"]},"network_mode":{"description":"Docker network mode (default: bridge)","type":"string"},"registry":{"description":"Custom registry (defaults to docker.io)","type":"string"},"timeout":{"description":"Container startup timeout","type":"string"}},"type":"object"},"config.DockerRecoveryConfig":{"description":"Docker recovery settings","properties":{"enabled":{"description":"Enable Docker recovery monitoring (default: true)","type":"boolean"},"max_retries":{"description":"Maximum retry attempts (0 = unlimited)","type":"integer"},"notify_on_failure":{"description":"Show notification on recovery failure (default: true)","type":"boolean"},"notify_on_retry":{"description":"Show notification on each retry (default: false)","type":"boolean"},"notify_on_start":{"description":"Show notification when recovery starts (default: true)","type":"boolean"},"notify_on_success":{"description":"Show notification on successful recovery (default: true)","type":"boolean"},"persistent_state":{"description":"Save recovery state across restarts (default: true)","type":"boolean"}},"type":"object"},"config.FeatureFlags":{"description":"Deprecated: Features flags are unused and have no runtime effect. Kept for backward compatibility.","properties":{"enable_async_storage":{"type":"boolean"},"enable_caching":{"type":"boolean"},"enable_contract_tests":{"type":"boolean"},"enable_debug_logging":{"description":"Development features","type":"boolean"},"enable_docker_isolation":{"type":"boolean"},"enable_event_bus":{"type":"boolean"},"enable_health_checks":{"type":"boolean"},"enable_metrics":{"type":"boolean"},"enable_oauth":{"description":"Security features","type":"boolean"},"enable_observability":{"description":"Observability features","type":"boolean"},"enable_quarantine":{"type":"boolean"},"enable_runtime":{"description":"Runtime features","type":"boolean"},"enable_search":{"description":"Storage features","type":"boolean"},"enable_sse":{"type":"boolean"},"enable_tracing":{"type":"boolean"},"enable_tray":{"type":"boolean"},"enable_web_ui":{"description":"UI features","type":"boolean"}},"type":"object"},"config.IntentDeclarationConfig":{"description":"Intent declaration settings (Spec 018)","properties":{"strict_server_validation":{"description":"StrictServerValidation controls whether server annotation mismatches\ncause rejection (true) or just warnings (false).\nDefault: true (reject mismatches)","type":"boolean"}},"type":"object"},"config.IsolationConfig":{"description":"Per-server isolation settings","properties":{"enabled":{"description":"Enable Docker isolation for this server (nil = inherit global; legacy, superseded by Mode)","type":"boolean"},"extra_args":{"description":"Additional docker run arguments for this server","items":{"type":"string"},"type":"array","uniqueItems":false},"image":{"description":"Custom Docker image (overrides default)","type":"string"},"log_driver":{"description":"Docker log driver override for this server","type":"string"},"log_max_files":{"description":"Maximum number of log files override","type":"string"},"log_max_size":{"description":"Maximum size of log files override","type":"string"},"mode":{"$ref":"#/components/schemas/config.IsolationMode"},"network_mode":{"description":"Custom network mode for this server","type":"string"},"working_dir":{"description":"Custom working directory in container","type":"string"}},"type":"object"},"config.IsolationMode":{"description":"Isolation mode: \"docker\" | \"sandbox\" | \"none\" (MCP-34.2). Unset per-server inherits the global mode; unset globally falls back to the legacy \"enabled\" flag (true ⇒ docker, false ⇒ none)","type":"string","x-enum-varnames":["IsolationModeDocker","IsolationModeSandbox","IsolationModeNone"]},"config.LogConfig":{"description":"Logging configuration","properties":{"compress":{"type":"boolean"},"enable_console":{"type":"boolean"},"enable_file":{"type":"boolean"},"filename":{"type":"string"},"json_format":{"type":"boolean"},"level":{"type":"string"},"log_dir":{"description":"Custom log directory","type":"string"},"max_age":{"description":"days","type":"integer"},"max_backups":{"description":"number of backup files","type":"integer"},"max_size":{"description":"MB","type":"integer"}},"type":"object"},"config.MetricsExporterConfig":{"description":"Metrics gates the Prometheus /metrics scrape endpoint (MCP-32). Disabled\nby default — operators opt in for k8s/enterprise deployments.","properties":{"enabled":{"description":"Enabled exposes /metrics on the existing HTTP listener when true.","type":"boolean"}},"type":"object"},"config.OAuthConfig":{"description":"OAuth configuration (keep even when empty to signal OAuth requirement)","properties":{"client_id":{"type":"string"},"client_secret":{"type":"string"},"extra_params":{"additionalProperties":{"type":"string"},"description":"Additional OAuth parameters (e.g., RFC 8707 resource)","type":"object"},"pkce_enabled":{"type":"boolean"},"redirect_uri":{"type":"string"},"scopes":{"items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.ObservabilityConfig":{"description":"Observability settings (Spec 069): usage aggregate cache/persistence cadence.","properties":{"metrics":{"$ref":"#/components/schemas/config.MetricsExporterConfig"},"tracing":{"$ref":"#/components/schemas/config.TracingExporterConfig"},"usage_cache_ttl":{"description":"UsageCacheTTL bounds the freshness of the usage endpoint's read cache for\nwide windows (FR-005). Default 5s.","type":"string"},"usage_persist_interval":{"description":"UsagePersistInterval is how often the actor-owned usage aggregate snapshot\nis flushed to storage. Default 30s.","type":"string"}},"type":"object"},"config.OutputSanitisationConfig":{"description":"Output sanitisation settings (Spec 054 Track B)","properties":{"max_redactions":{"description":"cap on redactions per response; default 100","type":"integer"},"response_action":{"description":"\"spotlight\" | \"redact\" | \"block\"; default \"spotlight\"","type":"string"},"spotlight_untrusted":{"description":"wrap untrusted output in spotlight markers; default true","type":"boolean"},"strip_classes":{"description":"classes to strip: ansi/c0c1/bidi/zero_width","items":{"type":"string"},"type":"array","uniqueItems":false},"strip_control_chars":{"description":"strip control-character classes; default false","type":"boolean"}},"type":"object"},"config.OutputValidationConfig":{"description":"Output-schema validation settings (Spec 056)","properties":{"max_bytes":{"description":"structured payload byte cap; default 5\u003c\u003c20","type":"integer"},"max_depth":{"description":"nesting depth cap; default 64","type":"integer"},"missing_structured_content":{"description":"\"allow\" | \"block\"; default \"allow\"","type":"string"},"mode":{"description":"\"off\" | \"warn\" | \"strict\"; default \"warn\"","type":"string"}},"type":"object"},"config.ProfileConfig":{"properties":{"name":{"description":"URL slug, validated","type":"string"},"servers":{"description":"references to mcpServers[].name","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.RegistryEntry":{"properties":{"count":{"description":"number or string","type":"string"},"description":{"type":"string"},"id":{"type":"string"},"name":{"type":"string"},"protocol":{"type":"string"},"provenance":{"description":"Provenance is the trust tag for this registry (MCP-866):\nRegistryProvenanceOfficial for built-in defaults, RegistryProvenanceCustom\nfor user-added registries. It is authoritatively (re)computed by the\nregistries merge from whether the ID is a shipped default — a user cannot\nclaim \"official\" by writing it into their config.","type":"string"},"requires_key":{"description":"RequiresKey marks a registry that needs an API key to be queried. When\ntrue and no key is configured, the registry is skipped/marked unavailable\nrather than failing the whole search (FR-008).","type":"boolean"},"servers_url":{"type":"string"},"tags":{"items":{"type":"string"},"type":"array","uniqueItems":false},"url":{"type":"string"}},"type":"object"},"config.SecurityConfig":{"description":"Security scanner settings (Spec 039)","properties":{"deep_scan":{"$ref":"#/components/schemas/config.DeepScanConfig"},"integrity_check_interval":{"type":"string"},"integrity_check_on_restart":{"type":"boolean"},"runtime_read_only":{"type":"boolean"},"runtime_tmpfs_size":{"type":"string"},"scan_timeout_default":{"type":"string"},"scanner_disable_no_new_privileges":{"description":"Deprecated (Spec 077 US3): migrated on load into DeepScan.DisableNoNewPrivileges\n(see migrateDeepScanConfig). Retained only so existing configs that still carry\nthe top-level key parse; consumers MUST read the effective value via\nSecurityConfig.IsDisableNoNewPrivileges. Cleared after migration.\n\nScannerDisableNoNewPrivileges, when true, omits the\n` + "`" + `--security-opt no-new-privileges` + "`" + ` flag from scanner container runs.\n\nBackground: snap-installed Docker on Ubuntu confines dockerd under the\n` + "`" + `snap.docker.dockerd` + "`" + ` AppArmor profile. When runc tries to transition\nthe container into the inner ` + "`" + `docker-default` + "`" + ` profile to exec the\nentrypoint, AppArmor refuses the transition because NO_NEW_PRIVS\nforbids privilege/profile changes on exec — the result is EPERM\n(\"operation not permitted\") and every scanner fails immediately.\n\nSet this to true ONLY on hosts hitting that incompatibility. Scanner\ncontainers still run with read-only rootfs, tmpfs /tmp, no-network by\ndefault, and read-only source mounts, so the marginal isolation loss\nis small. The preferred fix remains replacing snap docker with a\ndistro-packaged docker.","type":"boolean"},"scanner_fetch_package_source":{"description":"Deprecated (Spec 077 US3): migrated on load into DeepScan.FetchPackageSource\n(see migrateDeepScanConfig). Retained only so existing configs that still carry\nthe top-level key parse; consumers MUST read the effective value via\nSecurityConfig.EffectiveFetchPackageSource. Cleared after migration.\n\nScannerFetchPackageSource controls whether the scanner fetches the\nPUBLISHED source of package-runner servers (npx/uvx) — without executing\nit — when no local source is available (no Docker container, no local\npackage cache, no working_dir). This is the primary quarantine/scan\ntarget: a quarantined-on-add server is never run locally, so without this\nthe scan degrades to tool-definitions-only (no real source-level\nanalysis). See MCP-2206.\n\nFetching uses ` + "`" + `npm pack --ignore-scripts` + "`" + ` (npm) and ` + "`" + `uv pip download` + "`" + ` /\n` + "`" + `pip download` + "`" + ` with ` + "`" + `--only-binary=:all:` + "`" + ` (Python), which only download +\nunpack archives and NEVER run install, build, or setup.py — a scanner must\nnot execute the untrusted code it is scanning. The Python\n` + "`" + `--only-binary=:all:` + "`" + ` flag is required because downloading an sdist would\ninvoke its build backend (setup.py); packages with no wheel fall back to\ntool-definitions-only instead. Extraction is hardened against path\ntraversal and decompression bombs.\n\nDefault (nil) is ENABLED. Set to false on air-gapped deployments to\nforbid the scanner's network egress; such servers then fall back to the\ntool-definitions-only scan with no regression.","type":"boolean"},"scanner_registry_url":{"type":"string"}},"type":"object"},"config.SensitiveDataDetectionConfig":{"description":"Sensitive data detection settings (Spec 026)","properties":{"categories":{"additionalProperties":{"type":"boolean"},"description":"Enable/disable specific detection categories","type":"object"},"custom_patterns":{"description":"User-defined detection patterns","items":{"$ref":"#/components/schemas/config.CustomPattern"},"type":"array","uniqueItems":false},"enabled":{"description":"Enable sensitive data detection (default: true)","type":"boolean"},"entropy_threshold":{"description":"Shannon entropy threshold for high-entropy detection (default: 4.5)","type":"number"},"max_payload_size_kb":{"description":"Max size to scan before truncating (default: 1024)","type":"integer"},"scan_requests":{"description":"Scan tool call arguments (default: true)","type":"boolean"},"scan_responses":{"description":"Scan tool responses (default: true)","type":"boolean"},"sensitive_keywords":{"description":"Keywords to flag","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.ServerConfig":{"properties":{"args":{"items":{"type":"string"},"type":"array","uniqueItems":false},"auto_approve_tool_changes":{"description":"AutoApproveToolChanges is the per-server intent to auto-approve tool\nchanges/additions (disabling per-server rug-pull protection). Supersedes\nskip_quarantine. MCP-2930 only ACCEPTS, persists, and migrates this flag — it\nis NOT yet consulted at runtime; auto-approval is still governed by\nSkipQuarantine until the trust-baseline behavior change (MCP-2931) migrates the\nruntime consumers onto it.\nTri-state pointer (mirrors QuarantineEnabled): nil = unset (inherit/migrate\nfrom legacy skip_quarantine), explicit true/false = honored as-is so an\nexplicit auto_approve_tool_changes:false overrides a legacy skip_quarantine:true.\nRead via IsAutoApproveToolChanges().","type":"boolean"},"command":{"type":"string"},"created":{"type":"string"},"disabled_tools":{"description":"Denylist: these tools are hidden; mutually exclusive with enabled_tools","items":{"type":"string"},"type":"array","uniqueItems":false},"enabled":{"type":"boolean"},"enabled_tools":{"description":"Allowlist: only these tools are exposed; mutually exclusive with disabled_tools","items":{"type":"string"},"type":"array","uniqueItems":false},"env":{"additionalProperties":{"type":"string"},"type":"object"},"headers":{"additionalProperties":{"type":"string"},"description":"For HTTP servers","type":"object"},"health_check_interval":{"description":"Per-server discovery \u0026 health-check overrides (spec 074). Same *Duration\ntri-state as the global keys: nil = inherit the global value (or default),\npointer to 0s = disabled for this server, positive = that interval.\nHealthCheckInterval is fully wired into the per-server health loop;\nToolDiscoveryInterval is accepted/validated and round-trips for\nforward-compat, but the periodic index sweep is governed by the global\ncadence in this iteration (see spec 074 plan §C).","type":"string"},"init_timeout":{"description":"InitTimeout overrides the global init_timeout for this server's MCP\n` + "`" + `initialize` + "`" + ` handshake deadline (MCP-3322 / GH #760). *Duration tri-state:\nnil = inherit the global value (or 30s default), positive = that deadline.\nResolved by Config.ResolveInitTimeout; validated to {0} ∪ [1s, 30m]. Raise\nthis for upstreams that do legitimate first-run warmup (e.g. caching many\nchannels/users) before responding to ` + "`" + `initialize` + "`" + `.","type":"string"},"isolation":{"$ref":"#/components/schemas/config.IsolationConfig"},"launcher_wait_timeout":{"description":"LauncherWaitTimeout caps how long mcpproxy will wait for a locally-launched\nHTTP/SSE upstream's URL to become reachable after Spawn(). Only consulted\nwhen the server is configured with both Command and an HTTP/SSE URL — i.e.,\nmcpproxy starts the process AND connects via network. Stdio servers ignore\nthis field. Zero or unset → 30s default.","type":"string"},"name":{"type":"string"},"oauth":{"$ref":"#/components/schemas/config.OAuthConfig"},"protocol":{"description":"stdio, http, sse, streamable-http, auto","type":"string"},"quarantined":{"description":"Security quarantine status","type":"boolean"},"reconnect_on_use":{"description":"Attempt reconnection when a tool call targets a disconnected server","type":"boolean"},"shared":{"description":"Server edition: shared with all users","type":"boolean"},"skip_quarantine":{"description":"SkipQuarantine is DEPRECATED (MCP-2930): use AutoApproveToolChanges instead.\nKept for back-compat parsing; on config load a legacy skip_quarantine:true is\nmigrated to auto_approve_tool_changes:true only when the new field is unset\n(see normalizeServerQuarantineFlags).","type":"boolean"},"source_registry_id":{"description":"SourceRegistryID records which registry this server was added from (empty\nfor manually-configured servers). 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Servers doing legitimate\nfirst-run warmup (cache/index build) before answering ` + "`" + `initialize` + "`" + ` can\nraise this so they are not killed mid-startup.","type":"string"},"instructions":{"description":"Instructions text returned in the MCP initialize response to guide AI agents.\nWhen empty, a built-in default is used that explains retrieve_tools workflow.","type":"string"},"intent_declaration":{"$ref":"#/components/schemas/config.IntentDeclarationConfig"},"listen":{"type":"string"},"logging":{"$ref":"#/components/schemas/config.LogConfig"},"max_result_size_chars":{"description":"Advertised on every tool as ` + "`" + `_meta.anthropic/maxResultSizeChars` + "`" + `; raises Claude Code's inline-response ceiling from 50k to up to 500k chars. 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It subsumes the\ndeprecated top-level scanner_fetch_package_source / scanner_disable_no_new_privileges\nkeys (migrated on load) and gates the heavy Docker-based scanners + source\nextraction. Disabled by default (FR-006): only the deterministic in-process\nbaseline scanner runs. A deep-scan failure NEVER changes the baseline verdict\n(FR-007/FR-008).","properties":{"disable_no_new_privileges":{"description":"DisableNoNewPrivileges, when true, omits the ` + "`" + `--security-opt\nno-new-privileges` + "`" + ` flag from scanner container runs (snap-docker/AppArmor\nescape hatch). Absorbs the deprecated top-level\nscanner_disable_no_new_privileges. Default false.","type":"boolean"},"enabled":{"description":"Enabled is the master opt-in for the heavy layer (FR-006). Default false.","type":"boolean"},"fetch_package_source":{"description":"FetchPackageSource controls whether the scanner fetches the PUBLISHED\nsource of package-runner servers (npx/uvx) — without executing it — when\nno local source is available. Absorbs the deprecated top-level\nscanner_fetch_package_source. Default (nil) is ENABLED within deep scan.","type":"boolean"},"scanners":{"description":"Scanners optionally restricts which deep scanners may run under the\numbrella (by scanner id). Empty ⇒ all enabled deep scanners are eligible.","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.DockerIsolationConfig":{"description":"Docker isolation settings","properties":{"cpu_limit":{"description":"CPU limit for containers","type":"string"},"default_images":{"additionalProperties":{"type":"string"},"description":"Map of runtime type to Docker image","type":"object"},"enable_cache_volume":{"description":"Mount shared cache volumes for faster restarts (default: true)","type":"boolean"},"enabled":{"description":"Global enable/disable for Docker isolation (legacy; superseded by Mode)","type":"boolean"},"extra_args":{"description":"Additional docker run arguments","items":{"type":"string"},"type":"array","uniqueItems":false},"log_driver":{"description":"Docker log driver (default: json-file)","type":"string"},"log_max_files":{"description":"Maximum number of log files (default: 3)","type":"string"},"log_max_size":{"description":"Maximum size of log files (default: 100m)","type":"string"},"memory_limit":{"description":"Memory limit for containers","type":"string"},"mode":{"description":"Isolation mode: \"docker\" | \"sandbox\" | \"none\" (MCP-34.2). Unset per-server inherits the global mode; unset globally falls back to the legacy \"enabled\" flag (true ⇒ docker, false ⇒ none)","type":"string","x-enum-varnames":["IsolationModeDocker","IsolationModeSandbox","IsolationModeNone"]},"network_mode":{"description":"Docker network mode (default: bridge)","type":"string"},"registry":{"description":"Custom registry (defaults to docker.io)","type":"string"},"timeout":{"description":"Container startup timeout","type":"string"}},"type":"object"},"config.DockerRecoveryConfig":{"description":"Docker recovery settings","properties":{"enabled":{"description":"Enable Docker recovery monitoring (default: true)","type":"boolean"},"max_retries":{"description":"Maximum retry attempts (0 = unlimited)","type":"integer"},"notify_on_failure":{"description":"Show notification on recovery failure (default: true)","type":"boolean"},"notify_on_retry":{"description":"Show notification on each retry (default: false)","type":"boolean"},"notify_on_start":{"description":"Show notification when recovery starts (default: true)","type":"boolean"},"notify_on_success":{"description":"Show notification on successful recovery (default: true)","type":"boolean"},"persistent_state":{"description":"Save recovery state across restarts (default: true)","type":"boolean"}},"type":"object"},"config.FeatureFlags":{"description":"Deprecated: Features flags are unused and have no runtime effect. Kept for backward compatibility.","properties":{"enable_async_storage":{"type":"boolean"},"enable_caching":{"type":"boolean"},"enable_contract_tests":{"type":"boolean"},"enable_debug_logging":{"description":"Development features","type":"boolean"},"enable_docker_isolation":{"type":"boolean"},"enable_event_bus":{"type":"boolean"},"enable_health_checks":{"type":"boolean"},"enable_metrics":{"type":"boolean"},"enable_oauth":{"description":"Security features","type":"boolean"},"enable_observability":{"description":"Observability features","type":"boolean"},"enable_quarantine":{"type":"boolean"},"enable_runtime":{"description":"Runtime features","type":"boolean"},"enable_search":{"description":"Storage features","type":"boolean"},"enable_sse":{"type":"boolean"},"enable_tracing":{"type":"boolean"},"enable_tray":{"type":"boolean"},"enable_web_ui":{"description":"UI features","type":"boolean"}},"type":"object"},"config.IntentDeclarationConfig":{"description":"Intent declaration settings (Spec 018)","properties":{"strict_server_validation":{"description":"StrictServerValidation controls whether server annotation mismatches\ncause rejection (true) or just warnings (false).\nDefault: true (reject mismatches)","type":"boolean"}},"type":"object"},"config.IsolationConfig":{"description":"Per-server isolation settings","properties":{"enabled":{"description":"Enable Docker isolation for this server (nil = inherit global; legacy, superseded by Mode)","type":"boolean"},"extra_args":{"description":"Additional docker run arguments for this server","items":{"type":"string"},"type":"array","uniqueItems":false},"image":{"description":"Custom Docker image (overrides default)","type":"string"},"log_driver":{"description":"Docker log driver override for this server","type":"string"},"log_max_files":{"description":"Maximum number of log files override","type":"string"},"log_max_size":{"description":"Maximum size of log files override","type":"string"},"mode":{"$ref":"#/components/schemas/config.IsolationMode"},"network_mode":{"description":"Custom network mode for this server","type":"string"},"working_dir":{"description":"Custom working directory in container","type":"string"}},"type":"object"},"config.IsolationMode":{"description":"Isolation mode: \"docker\" | \"sandbox\" | \"none\" (MCP-34.2). Unset per-server inherits the global mode; unset globally falls back to the legacy \"enabled\" flag (true ⇒ docker, false ⇒ none)","type":"string","x-enum-varnames":["IsolationModeDocker","IsolationModeSandbox","IsolationModeNone"]},"config.LogConfig":{"description":"Logging configuration","properties":{"compress":{"type":"boolean"},"enable_console":{"type":"boolean"},"enable_file":{"type":"boolean"},"filename":{"type":"string"},"json_format":{"type":"boolean"},"level":{"type":"string"},"log_dir":{"description":"Custom log directory","type":"string"},"max_age":{"description":"days","type":"integer"},"max_backups":{"description":"number of backup files","type":"integer"},"max_size":{"description":"MB","type":"integer"}},"type":"object"},"config.MetricsExporterConfig":{"description":"Metrics gates the Prometheus /metrics scrape endpoint (MCP-32). Disabled\nby default — operators opt in for k8s/enterprise deployments.","properties":{"enabled":{"description":"Enabled exposes /metrics on the existing HTTP listener when true.","type":"boolean"}},"type":"object"},"config.OAuthConfig":{"description":"OAuth configuration (keep even when empty to signal OAuth requirement)","properties":{"client_id":{"type":"string"},"client_secret":{"type":"string"},"extra_params":{"additionalProperties":{"type":"string"},"description":"Additional OAuth parameters (e.g., RFC 8707 resource)","type":"object"},"pkce_enabled":{"type":"boolean"},"redirect_uri":{"type":"string"},"scopes":{"items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.ObservabilityConfig":{"description":"Observability settings (Spec 069): usage aggregate cache/persistence cadence.","properties":{"metrics":{"$ref":"#/components/schemas/config.MetricsExporterConfig"},"tracing":{"$ref":"#/components/schemas/config.TracingExporterConfig"},"usage_cache_ttl":{"description":"UsageCacheTTL bounds the freshness of the usage endpoint's read cache for\nwide windows (FR-005). Default 5s.","type":"string"},"usage_persist_interval":{"description":"UsagePersistInterval is how often the actor-owned usage aggregate snapshot\nis flushed to storage. Default 30s.","type":"string"}},"type":"object"},"config.OutputSanitisationConfig":{"description":"Output sanitisation settings (Spec 054 Track B)","properties":{"max_redactions":{"description":"cap on redactions per response; default 100","type":"integer"},"response_action":{"description":"\"spotlight\" | \"redact\" | \"block\"; default \"spotlight\"","type":"string"},"spotlight_untrusted":{"description":"wrap untrusted output in spotlight markers; default true","type":"boolean"},"strip_classes":{"description":"classes to strip: ansi/c0c1/bidi/zero_width","items":{"type":"string"},"type":"array","uniqueItems":false},"strip_control_chars":{"description":"strip control-character classes; default false","type":"boolean"}},"type":"object"},"config.OutputValidationConfig":{"description":"Output-schema validation settings (Spec 056)","properties":{"max_bytes":{"description":"structured payload byte cap; default 5\u003c\u003c20","type":"integer"},"max_depth":{"description":"nesting depth cap; default 64","type":"integer"},"missing_structured_content":{"description":"\"allow\" | \"block\"; default \"allow\"","type":"string"},"mode":{"description":"\"off\" | \"warn\" | \"strict\"; default \"warn\"","type":"string"}},"type":"object"},"config.ProfileConfig":{"properties":{"name":{"description":"URL slug, validated","type":"string"},"servers":{"description":"references to mcpServers[].name","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.RegistryEntry":{"properties":{"count":{"description":"number or string","type":"string"},"description":{"type":"string"},"id":{"type":"string"},"name":{"type":"string"},"protocol":{"type":"string"},"provenance":{"description":"Provenance is the trust tag for this registry (MCP-866):\nRegistryProvenanceOfficial for built-in defaults, RegistryProvenanceCustom\nfor user-added registries. It is authoritatively (re)computed by the\nregistries merge from whether the ID is a shipped default — a user cannot\nclaim \"official\" by writing it into their config.","type":"string"},"requires_key":{"description":"RequiresKey marks a registry that needs an API key to be queried. When\ntrue and no key is configured, the registry is skipped/marked unavailable\nrather than failing the whole search (FR-008).","type":"boolean"},"servers_url":{"type":"string"},"tags":{"items":{"type":"string"},"type":"array","uniqueItems":false},"url":{"type":"string"}},"type":"object"},"config.SecurityConfig":{"description":"Security scanner settings (Spec 039)","properties":{"deep_scan":{"$ref":"#/components/schemas/config.DeepScanConfig"},"integrity_check_interval":{"type":"string"},"integrity_check_on_restart":{"type":"boolean"},"runtime_read_only":{"type":"boolean"},"runtime_tmpfs_size":{"type":"string"},"scan_timeout_default":{"type":"string"},"scanner_disable_no_new_privileges":{"description":"Deprecated (Spec 077 US3): migrated on load into DeepScan.DisableNoNewPrivileges\n(see migrateDeepScanConfig). Retained only so existing configs that still carry\nthe top-level key parse; consumers MUST read the effective value via\nSecurityConfig.IsDisableNoNewPrivileges. Cleared after migration.\n\nScannerDisableNoNewPrivileges, when true, omits the\n` + "`" + `--security-opt no-new-privileges` + "`" + ` flag from scanner container runs.\n\nBackground: snap-installed Docker on Ubuntu confines dockerd under the\n` + "`" + `snap.docker.dockerd` + "`" + ` AppArmor profile. When runc tries to transition\nthe container into the inner ` + "`" + `docker-default` + "`" + ` profile to exec the\nentrypoint, AppArmor refuses the transition because NO_NEW_PRIVS\nforbids privilege/profile changes on exec — the result is EPERM\n(\"operation not permitted\") and every scanner fails immediately.\n\nSet this to true ONLY on hosts hitting that incompatibility. Scanner\ncontainers still run with read-only rootfs, tmpfs /tmp, no-network by\ndefault, and read-only source mounts, so the marginal isolation loss\nis small. The preferred fix remains replacing snap docker with a\ndistro-packaged docker.","type":"boolean"},"scanner_fetch_package_source":{"description":"Deprecated (Spec 077 US3): migrated on load into DeepScan.FetchPackageSource\n(see migrateDeepScanConfig). Retained only so existing configs that still carry\nthe top-level key parse; consumers MUST read the effective value via\nSecurityConfig.EffectiveFetchPackageSource. Cleared after migration.\n\nScannerFetchPackageSource controls whether the scanner fetches the\nPUBLISHED source of package-runner servers (npx/uvx) — without executing\nit — when no local source is available (no Docker container, no local\npackage cache, no working_dir). This is the primary quarantine/scan\ntarget: a quarantined-on-add server is never run locally, so without this\nthe scan degrades to tool-definitions-only (no real source-level\nanalysis). See MCP-2206.\n\nFetching uses ` + "`" + `npm pack --ignore-scripts` + "`" + ` (npm) and ` + "`" + `uv pip download` + "`" + ` /\n` + "`" + `pip download` + "`" + ` with ` + "`" + `--only-binary=:all:` + "`" + ` (Python), which only download +\nunpack archives and NEVER run install, build, or setup.py — a scanner must\nnot execute the untrusted code it is scanning. The Python\n` + "`" + `--only-binary=:all:` + "`" + ` flag is required because downloading an sdist would\ninvoke its build backend (setup.py); packages with no wheel fall back to\ntool-definitions-only instead. Extraction is hardened against path\ntraversal and decompression bombs.\n\nDefault (nil) is ENABLED. Set to false on air-gapped deployments to\nforbid the scanner's network egress; such servers then fall back to the\ntool-definitions-only scan with no regression.","type":"boolean"},"scanner_registry_url":{"type":"string"}},"type":"object"},"config.SensitiveDataDetectionConfig":{"description":"Sensitive data detection settings (Spec 026)","properties":{"categories":{"additionalProperties":{"type":"boolean"},"description":"Enable/disable specific detection categories","type":"object"},"custom_patterns":{"description":"User-defined detection patterns","items":{"$ref":"#/components/schemas/config.CustomPattern"},"type":"array","uniqueItems":false},"enabled":{"description":"Enable sensitive data detection (default: true)","type":"boolean"},"entropy_threshold":{"description":"Shannon entropy threshold for high-entropy detection (default: 4.5)","type":"number"},"max_payload_size_kb":{"description":"Max size to scan before truncating (default: 1024)","type":"integer"},"scan_requests":{"description":"Scan tool call arguments (default: true)","type":"boolean"},"scan_responses":{"description":"Scan tool responses (default: true)","type":"boolean"},"sensitive_keywords":{"description":"Keywords to flag","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"config.ServerConfig":{"properties":{"args":{"items":{"type":"string"},"type":"array","uniqueItems":false},"auto_approve_tool_changes":{"description":"AutoApproveToolChanges is the per-server intent to auto-approve tool\nchanges/additions (disabling per-server rug-pull protection). Supersedes\nskip_quarantine. MCP-2930 only ACCEPTS, persists, and migrates this flag — it\nis NOT yet consulted at runtime; auto-approval is still governed by\nSkipQuarantine until the trust-baseline behavior change (MCP-2931) migrates the\nruntime consumers onto it.\nTri-state pointer (mirrors QuarantineEnabled): nil = unset (inherit/migrate\nfrom legacy skip_quarantine), explicit true/false = honored as-is so an\nexplicit auto_approve_tool_changes:false overrides a legacy skip_quarantine:true.\nRead via IsAutoApproveToolChanges().","type":"boolean"},"command":{"type":"string"},"created":{"type":"string"},"disabled_tools":{"description":"Denylist: these tools are hidden; mutually exclusive with enabled_tools","items":{"type":"string"},"type":"array","uniqueItems":false},"enabled":{"type":"boolean"},"enabled_tools":{"description":"Allowlist: only these tools are exposed; mutually exclusive with disabled_tools","items":{"type":"string"},"type":"array","uniqueItems":false},"env":{"additionalProperties":{"type":"string"},"type":"object"},"headers":{"additionalProperties":{"type":"string"},"description":"For HTTP servers","type":"object"},"health_check_interval":{"description":"Per-server discovery \u0026 health-check overrides (spec 074). Same *Duration\ntri-state as the global keys: nil = inherit the global value (or default),\npointer to 0s = disabled for this server, positive = that interval.\nHealthCheckInterval is fully wired into the per-server health loop;\nToolDiscoveryInterval is accepted/validated and round-trips for\nforward-compat, but the periodic index sweep is governed by the global\ncadence in this iteration (see spec 074 plan §C).","type":"string"},"init_timeout":{"description":"InitTimeout overrides the global init_timeout for this server's MCP\n` + "`" + `initialize` + "`" + ` handshake deadline (MCP-3322 / GH #760). *Duration tri-state:\nnil = inherit the global value (or 30s default), positive = that deadline.\nResolved by Config.ResolveInitTimeout; validated to {0} ∪ [1s, 30m]. Raise\nthis for upstreams that do legitimate first-run warmup (e.g. caching many\nchannels/users) before responding to ` + "`" + `initialize` + "`" + `.","type":"string"},"isolation":{"$ref":"#/components/schemas/config.IsolationConfig"},"launcher_wait_timeout":{"description":"LauncherWaitTimeout caps how long mcpproxy will wait for a locally-launched\nHTTP/SSE upstream's URL to become reachable after Spawn(). Only consulted\nwhen the server is configured with both Command and an HTTP/SSE URL — i.e.,\nmcpproxy starts the process AND connects via network. Stdio servers ignore\nthis field. Zero or unset → 30s default.","type":"string"},"name":{"type":"string"},"oauth":{"$ref":"#/components/schemas/config.OAuthConfig"},"protocol":{"description":"stdio, http, sse, streamable-http, auto","type":"string"},"quarantined":{"description":"Security quarantine status","type":"boolean"},"reconnect_on_use":{"description":"Attempt reconnection when a tool call targets a disconnected server","type":"boolean"},"shared":{"description":"Server edition: shared with all users","type":"boolean"},"skip_quarantine":{"description":"SkipQuarantine is DEPRECATED (MCP-2930): use AutoApproveToolChanges instead.\nKept for back-compat parsing; on config load a legacy skip_quarantine:true is\nmigrated to auto_approve_tool_changes:true only when the new field is unset\n(see normalizeServerQuarantineFlags).","type":"boolean"},"source_registry_id":{"description":"SourceRegistryID records which registry this server was added from (empty\nfor manually-configured servers). MCP-866: surfaced in the approval /\nquarantine view so a reviewer can see a server's origin.","type":"string"},"source_registry_provenance":{"description":"SourceRegistryProvenance records the source registry's provenance at add\ntime (RegistryProvenanceOfficial / RegistryProvenanceCustom). It is purely\ninformational (MCP-1072) — surfaced so a reviewer can see a server's origin\n— and no longer gates quarantine or skip_quarantine.","type":"string"},"tool_discovery_interval":{"type":"string"},"updated":{"type":"string"},"url":{"type":"string"},"working_dir":{"description":"Working directory for stdio servers","type":"string"}},"type":"object"},"config.TLSConfig":{"description":"TLS configuration","properties":{"certs_dir":{"description":"Directory for certificates","type":"string"},"enabled":{"description":"Enable HTTPS","type":"boolean"},"hsts":{"description":"Enable HTTP Strict Transport Security","type":"boolean"},"require_client_cert":{"description":"Enable mTLS","type":"boolean"}},"type":"object"},"config.TelemetryConfig":{"description":"Telemetry settings (Spec 036)","properties":{"anonymous_id":{"description":"Auto-generated UUIDv4","type":"string"},"anonymous_id_created_at":{"description":"Spec 042 (Tier 2) additions — all default-zero, all backwards-compatible.","type":"string"},"enabled":{"description":"Default: true (opt-out)","type":"boolean"},"endpoint":{"description":"Override for testing","type":"string"},"last_reported_version":{"description":"Upgrade funnel","type":"string"},"last_startup_outcome":{"description":"success|port_conflict|db_locked|...","type":"string"},"notice_shown":{"description":"First-run notice flag","type":"boolean"}},"type":"object"},"config.TokenizerConfig":{"description":"Tokenizer configuration for token counting","properties":{"default_model":{"description":"Default model for tokenization (e.g., \"gpt-4\")","type":"string"},"enabled":{"description":"Enable token counting","type":"boolean"},"encoding":{"description":"Default encoding (e.g., \"cl100k_base\")","type":"string"}},"type":"object"},"config.TracingExporterConfig":{"description":"Tracing gates the OpenTelemetry OTLP trace exporter (MCP-32). Disabled by\ndefault.","properties":{"enabled":{"description":"Enabled turns on OTLP trace export for tool calls and upstream hops.","type":"boolean"},"endpoint":{"description":"Endpoint is the collector address as host:port (no scheme), e.g.\n\"localhost:4318\" for http or \"localhost:4317\" for grpc.","type":"string"},"protocol":{"description":"Protocol selects the OTLP transport: \"http\" or \"grpc\".","type":"string"},"sample_rate":{"description":"SampleRate is the head-based trace sampling ratio in [0,1]. Default 0.1.","type":"number"}},"type":"object"},"config.UpdateCheckConfig":{"description":"Update-check settings (Spec 079 FR-012): config-file control of the\nbackground upgrade-awareness checker (internal/updatecheck). nil =\nenabled on the stable channel (existing default behavior). The existing\nenvironment switches keep working and WIN over these keys (FR-014):\nMCPPROXY_DISABLE_AUTO_UPDATE=true force-disables even when\nenabled=true, and MCPPROXY_ALLOW_PRERELEASE_UPDATES=true force-selects\nthe rc channel even when channel=stable.","properties":{"channel":{"description":"Channel selects which releases are offered as updates: \"stable\"\n(default; prereleases never offered) or \"rc\" (prereleases included).\nEmpty resolves to stable. Validated in ValidateDetailed.","type":"string"},"enabled":{"description":"Enabled gates all update checking. Tri-state: nil/absent = enabled\n(default true, matching pre-079 behavior). When false, no network\ncheck is performed and no upgrade nudge appears on any surface\n(FR-015) — /api/v1/info omits the update object entirely.","type":"boolean"}},"type":"object"},"configimport.FailedServer":{"properties":{"details":{"type":"string"},"error":{"type":"string"},"name":{"type":"string"}},"type":"object"},"configimport.ImportSummary":{"properties":{"failed":{"type":"integer"},"imported":{"type":"integer"},"skipped":{"type":"integer"},"total":{"type":"integer"}},"type":"object"},"configimport.SkippedServer":{"properties":{"name":{"type":"string"},"reason":{"description":"\"already_exists\", \"filtered_out\", \"invalid_name\"","type":"string"}},"type":"object"},"contracts.APIResponse":{"allOf":[{"$ref":"#/components/schemas/data"}],"properties":{"data":{"type":"object"},"error":{"type":"string"},"request_id":{"type":"string"},"success":{"type":"boolean"}},"type":"object"},"contracts.ActivityDetailResponse":{"properties":{"activity":{"$ref":"#/components/schemas/contracts.ActivityRecord"}},"type":"object"},"contracts.ActivityListResponse":{"properties":{"activities":{"items":{"$ref":"#/components/schemas/contracts.ActivityRecord"},"type":"array","uniqueItems":false},"limit":{"type":"integer"},"offset":{"type":"integer"},"total":{"type":"integer"}},"type":"object"},"contracts.ActivityRecord":{"properties":{"arguments":{"description":"Tool call arguments","type":"object"},"detection_types":{"description":"List of detection types found","items":{"type":"string"},"type":"array","uniqueItems":false},"duration_ms":{"description":"Execution duration in milliseconds","type":"integer"},"error_message":{"description":"Error details if status is \"error\"","type":"string"},"has_sensitive_data":{"description":"Sensitive data detection fields (Spec 026)","type":"boolean"},"id":{"description":"Unique identifier (ULID format)","type":"string"},"max_severity":{"description":"Highest severity level detected (critical, high, medium, low)","type":"string"},"metadata":{"description":"Additional context-specific data","type":"object"},"request_id":{"description":"HTTP request ID for correlation","type":"string"},"response":{"description":"Tool response (potentially truncated)","type":"string"},"response_truncated":{"description":"True if response was truncated","type":"boolean"},"server_name":{"description":"Name of upstream MCP server","type":"string"},"session_id":{"description":"MCP session ID for correlation","type":"string"},"source":{"$ref":"#/components/schemas/contracts.ActivitySource"},"status":{"description":"Result status: \"success\", \"error\", \"blocked\"","type":"string"},"timestamp":{"description":"When activity occurred","type":"string"},"tool_name":{"description":"Name of tool called","type":"string"},"type":{"$ref":"#/components/schemas/contracts.ActivityType"}},"type":"object"},"contracts.ActivitySource":{"description":"How activity was triggered: \"mcp\", \"cli\", \"api\"","type":"string","x-enum-varnames":["ActivitySourceMCP","ActivitySourceCLI","ActivitySourceAPI"]},"contracts.ActivitySummaryResponse":{"properties":{"blocked_count":{"description":"Count of blocked activities","type":"integer"},"end_time":{"description":"End of the period (RFC3339)","type":"string"},"error_count":{"description":"Count of error activities","type":"integer"},"period":{"description":"Time period (1h, 24h, 7d, 30d)","type":"string"},"start_time":{"description":"Start of the period (RFC3339)","type":"string"},"success_count":{"description":"Count of successful activities","type":"integer"},"top_servers":{"description":"Top servers by activity count","items":{"$ref":"#/components/schemas/contracts.ActivityTopServer"},"type":"array","uniqueItems":false},"top_tools":{"description":"Top tools by activity count","items":{"$ref":"#/components/schemas/contracts.ActivityTopTool"},"type":"array","uniqueItems":false},"total_count":{"description":"Total activity count","type":"integer"}},"type":"object"},"contracts.ActivityTopServer":{"properties":{"count":{"description":"Activity count","type":"integer"},"name":{"description":"Server name","type":"string"}},"type":"object"},"contracts.ActivityTopTool":{"properties":{"count":{"description":"Activity count","type":"integer"},"server":{"description":"Server name","type":"string"},"tool":{"description":"Tool name","type":"string"}},"type":"object"},"contracts.ActivityType":{"description":"Type of activity","type":"string","x-enum-varnames":["ActivityTypeToolCall","ActivityTypePolicyDecision","ActivityTypeQuarantineChange","ActivityTypeServerChange"]},"contracts.AddFromRegistryRequest":{"properties":{"enabled":{"description":"defaults to true when nil","type":"boolean"},"env":{"additionalProperties":{"type":"string"},"description":"overrides + required-input values","type":"object"},"name":{"description":"optional name override","type":"string"}},"type":"object"},"contracts.AddRegistrySourceRequest":{"properties":{"id":{"description":"derived from the host when empty","type":"string"},"name":{"description":"defaults to the id","type":"string"},"protocol":{"description":"defaults to modelcontextprotocol/registry","type":"string"},"url":{"description":"required https registry URL","type":"string"}},"type":"object"},"contracts.ConfigApplyResult":{"properties":{"applied_immediately":{"type":"boolean"},"changed_fields":{"items":{"type":"string"},"type":"array","uniqueItems":false},"requires_restart":{"type":"boolean"},"restart_reason":{"type":"string"},"success":{"type":"boolean"},"validation_errors":{"items":{"$ref":"#/components/schemas/contracts.ValidationError"},"type":"array","uniqueItems":false}},"type":"object"},"contracts.DCRStatus":{"properties":{"attempted":{"type":"boolean"},"error":{"type":"string"},"status_code":{"type":"integer"},"success":{"type":"boolean"}},"type":"object"},"contracts.DeepScanDescriptor":{"description":"DeepScan reports the opt-in \"deep scan\" layer status (Spec 077 US3),\nSEPARATELY from the baseline verdict above. Always emitted on a computed\nsummary — when deep scan is off (the default) it reports enabled=false\nplus any enabled-but-skipped Docker scanners. It never influences Status.","properties":{"available":{"type":"boolean"},"enabled":{"type":"boolean"},"ran":{"type":"boolean"},"scanners_failed":{"items":{"$ref":"#/components/schemas/contracts.DeepScanScannerFailure"},"type":"array","uniqueItems":false},"skipped_scanners":{"description":"SkippedScanners lists Docker scanners the user enabled that are skipped\nbecause security.deep_scan.enabled is false (informational).","items":{"type":"string"},"type":"array","uniqueItems":false}},"type":"object"},"contracts.DeepScanScannerFailure":{"properties":{"id":{"type":"string"},"reason":{"type":"string"}},"type":"object"},"contracts.DeprecatedConfigWarning":{"properties":{"field":{"type":"string"},"message":{"type":"string"},"replacement":{"type":"string"}},"type":"object"},"contracts.Diagnostic":{"description":"Spec 044 — structured diagnostic error and stable error code. Both\nare populated when the server is in a failed state and the error\nhas been classified by internal/diagnostics. Healthy servers omit\nthese fields.","properties":{"cause":{"type":"string"},"code":{"type":"string"},"detected_at":{"type":"string"},"docs_url":{"type":"string"},"fix_steps":{"items":{"$ref":"#/components/schemas/contracts.DiagnosticFixStep"},"type":"array","uniqueItems":false},"severity":{"type":"string"},"user_message":{"type":"string"}},"type":"object"},"contracts.DiagnosticFixStep":{"properties":{"command":{"type":"string"},"destructive":{"type":"boolean"},"fixer_key":{"type":"string"},"label":{"type":"string"},"type":{"type":"string"},"url":{"type":"string"}},"type":"object"},"contracts.Diagnostics":{"properties":{"deprecated_configs":{"description":"Deprecated config fields found","items":{"$ref":"#/components/schemas/contracts.DeprecatedConfigWarning"},"type":"array","uniqueItems":false},"docker_status":{"$ref":"#/components/schemas/contracts.DockerStatus"},"missing_secrets":{"description":"Renamed to avoid 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Served from an in-memory snapshot — never a per-request full-log scan. Per-tool metrics are lifetime-cumulative; ` + "`" + `window` + "`" + ` scopes the timeline and filters the tool list to tools active within the span.","parameters":[{"description":"Time window for timeline + tool-list membership","in":"query","name":"window","schema":{"enum":["24h","7d","all"],"type":"string"}},{"description":"Filter to one server","in":"query","name":"server","schema":{"type":"string"}},{"description":"Filter to one tool","in":"query","name":"tool","schema":{"type":"string"}},{"description":"Filter to tools with activity of this status","in":"query","name":"status","schema":{"enum":["success","error","blocked"],"type":"string"}},{"description":"Top-N tools by sort key; remainder folded into 'other' (default 20)","in":"query","name":"top","schema":{"type":"integer"}},{"description":"Ranking key for the per-tool list","in":"query","name":"sort","schema":{"enum":["calls","resp_bytes","error_rate","p95"],"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"type":"object"}}}},"responses":{"200":{"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/data"}],"properties":{"data":{"type":"object"},"error":{"type":"string"},"request_id":{"type":"string"},"success":{"type":"boolean"}},"type":"object"}}},"description":"OK"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"Bad Request"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"Unauthorized"}},"security":[{"ApiKeyHeader":[]},{"ApiKeyQuery":[]}],"summary":"Get usage statistics aggregate","tags":["Activity"]}},"/api/v1/activity/{id}":{"get":{"description":"Returns full details for a single activity record","parameters":[{"description":"Activity record ID (ULID)","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"type":"object"}}}},"responses":{"200":{"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/data"}],"properties":{"data":{"type":"object"},"error":{"type":"string"},"request_id":{"type":"string"},"success":{"type":"boolean"}},"type":"object"}}},"description":"OK"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"Unauthorized"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"Not Found"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"Internal Server Error"}},"security":[{"ApiKeyHeader":[]},{"ApiKeyQuery":[]}],"summary":"Get activity record details","tags":["Activity"]}},"/api/v1/annotations/coverage":{"get":{"description":"Reports how many upstream tools have MCP annotations vs don't, broken down by server","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Annotation coverage report"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get annotation coverage report","tags":["annotations"]}},"/api/v1/config":{"get":{"description":"Retrieves the current MCPProxy configuration including all server definitions, global settings, and runtime parameters","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GetConfigResponse"}}},"description":"Configuration retrieved successfully"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to get configuration"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get current configuration","tags":["config"]},"patch":{"description":"Deep-merges only the fields present in the request body onto the live in-memory configuration and routes the result through the existing apply pipeline (validation, change detection, disk persistence, hot-reload). Fields the client omits — including masked secrets such as ` + "`" + `api_key` + "`" + ` and secret request headers — are preserved verbatim. Nested objects are merged recursively; arrays and scalars replace wholesale.","requestBody":{"content":{"application/json":{"schema":{"type":"object"}}},"description":"Partial configuration with only the fields to change","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ConfigApplyResult"}}},"description":"Configuration patch applied (inspect validation_errors for rejected values)"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Invalid JSON payload or empty patch"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to read or apply configuration"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Partially update configuration","tags":["config"]}},"/api/v1/config/apply":{"post":{"description":"Applies a new MCPProxy configuration. Validates and persists the configuration to disk. Some changes apply immediately, while others may require a restart. Returns detailed information about applied changes and restart requirements.","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/config.Config"}}},"description":"Configuration to apply","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ConfigApplyResult"}}},"description":"Configuration applied successfully with change details"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Invalid JSON payload"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to apply configuration"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Apply configuration","tags":["config"]}},"/api/v1/config/docker-isolation":{"patch":{"description":"Convenience endpoint to flip ` + "`" + `docker_isolation.enabled` + "`" + ` without resending the full config. Persists to disk via the existing config writer — the file watcher then hot-reloads the change. Returns the new state and whether a restart is required for existing connections to pick it up.","requestBody":{"content":{"application/json":{"schema":{"properties":{"enabled":{"type":"boolean"}},"type":"object"}}},"description":"New isolation state","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ConfigApplyResult"}}},"description":"Isolation toggle applied"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Invalid JSON payload"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to apply configuration"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Toggle global Docker isolation","tags":["config"]}},"/api/v1/config/validate":{"post":{"description":"Validates a provided MCPProxy configuration without applying it. Checks for syntax errors, invalid server definitions, conflicting settings, and other configuration issues.","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/config.Config"}}},"description":"Configuration to validate","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ValidateConfigResponse"}}},"description":"Configuration validation result"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Invalid JSON payload"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Validation failed"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Validate configuration","tags":["config"]}},"/api/v1/connect":{"get":{"description":"Returns the connection status for all known MCP client applications.\nEach entry indicates whether the client config file exists and whether\nMCPProxy is currently registered in it.","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"List of ClientStatus objects"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"List client connection status","tags":["connect"]}},"/api/v1/connect/{client}":{"delete":{"description":"Remove the MCPProxy entry from the specified client's configuration file.\nCreates a backup of the existing config before modifying.","parameters":[{"description":"Client ID (claude-code, claude-desktop, cursor, windsurf, vscode, codex, gemini, opencode)","in":"path","name":"client","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/httpapi.ConnectRequest"}}},"description":"Optional parameters (server_name)"},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"ConnectResult"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request"},"403":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Permission denied (macOS App-Data block)"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unknown client or entry not found"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Disconnect MCPProxy from a client","tags":["connect"]},"get":{"description":"Resolves one client's status by reading its config file on demand.\nThis is the only Connect endpoint that opens a client config file, so\non macOS it is the sole place an App-Data privacy prompt may legitimately\nappear (scoped to this user action). Resolves access_state to\naccessible|absent|denied|malformed and populates remediation when denied.","parameters":[{"description":"Client ID (claude-code, claude-desktop, cursor, windsurf, vscode, codex, gemini, opencode)","in":"path","name":"client","required":true,"schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"ClientStatus"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unknown client"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get a single client's connection status (on-demand)","tags":["connect"]},"post":{"description":"Register MCPProxy as an MCP server in the specified client's configuration file.\nCreates a backup of the existing config before modifying.","parameters":[{"description":"Client ID (claude-code, claude-desktop, cursor, windsurf, vscode, codex, gemini, opencode)","in":"path","name":"client","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/httpapi.ConnectRequest"}}},"description":"Optional connection parameters"},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"ConnectResult"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request"},"403":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Permission denied (macOS App-Data block)"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unknown client"},"409":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Already connected (use force=true)"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Connect MCPProxy to a client","tags":["connect"]}},"/api/v1/connect/{client}/preview":{"get":{"description":"Returns the exact entry a subsequent connect would add to the client's\nconfig — target path, server key, entry name, and entry contents — WITHOUT\nmodifying the file or creating a backup (Spec 078 US1). The embedded API key\nis masked in the payload; contains_api_key flags that a credential is written.\nentry_exists distinguishes a create from an overwrite of a same-named entry.\nReads the config on demand to classify create-vs-overwrite, so on macOS this\nmay raise an App-Data privacy prompt; a denial returns 403 + remediation.","parameters":[{"description":"Client ID (claude-code, claude-desktop, cursor, windsurf, vscode, codex, gemini, opencode)","in":"path","name":"client","required":true,"schema":{"type":"string"}},{"description":"Entry name to preview (defaults to mcpproxy); mirror the value passed to POST connect","in":"query","name":"server_name","schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"ConnectPreview"},"403":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Permission denied (macOS App-Data block)"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unknown client"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Preview the change a connect would make (no write)","tags":["connect"]}},"/api/v1/connect/{client}/undo":{"post":{"description":"Reverts the connect that produced the named backup (Spec 078 US3):\nrestores the client config byte-for-byte from that backup, or — when\nbackup_name is empty because the connect created the file — deletes the\ncreated file. backup_name is the bare filename of the backup the connect\nreturned (never a path); undo resolves the full path server-side inside\nthe client's own config directory, so a client value cannot escape it.\nRefuses with 409 when the config changed since the connect (undo never\nclobbers later edits; use DELETE /connect/{client} for a surgical entry\nremoval instead). Takes its own safety backup first; its path is returned\nas backup_path in the result.","parameters":[{"description":"Client ID (claude-code, claude-desktop, cursor, windsurf, vscode, codex, gemini, opencode)","in":"path","name":"client","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/httpapi.UndoConnectRequest"}}},"description":"Undo parameters (server_name, backup_name = the bare filename of the backup the preceding connect returned)"},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"ConnectResult (action restored|deleted)"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request (e.g. backup_name is a path, or not a backup of this client's config)"},"403":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Permission denied (macOS App-Data block)"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unknown client or backup no longer exists"},"409":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Config changed since connect; undo refused"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Undo a connect, restoring the pre-connect config","tags":["connect"]}},"/api/v1/diagnostics":{"get":{"description":"Get comprehensive health diagnostics including upstream errors, OAuth requirements, missing secrets, and Docker status","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.Diagnostics"}}},"description":"Health diagnostics"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get health diagnostics","tags":["diagnostics"]}},"/api/v1/docker/status":{"get":{"description":"Retrieve current Docker availability and recovery status","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Docker status information"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get Docker status","tags":["docker"]}},"/api/v1/doctor":{"get":{"description":"Get comprehensive health diagnostics including upstream errors, OAuth requirements, missing secrets, and Docker status","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.Diagnostics"}}},"description":"Health diagnostics"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get health diagnostics","tags":["diagnostics"]}},"/api/v1/feedback":{"post":{"description":"Submit a bug report, feature request, or general feedback","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/telemetry.FeedbackRequest"}}},"description":"Feedback request","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/telemetry.FeedbackResponse"}}},"description":"OK"},"400":{"content":{"application/json":{"schema":{"additionalProperties":{"type":"string"},"type":"object"}}},"description":"Bad Request"},"429":{"content":{"application/json":{"schema":{"additionalProperties":{"type":"string"},"type":"object"}}},"description":"Too Many Requests"},"500":{"content":{"application/json":{"schema":{"additionalProperties":{"type":"string"},"type":"object"}}},"description":"Internal Server Error"}},"security":[{"ApiKeyAuth":[]}],"summary":"Submit feedback","tags":["feedback"]}},"/api/v1/index/search":{"get":{"description":"Search across all upstream MCP server tools using BM25 keyword search","parameters":[{"description":"Search query","in":"query","name":"q","required":true,"schema":{"type":"string"}},{"description":"Maximum number of results","in":"query","name":"limit","schema":{"default":10,"maximum":100,"type":"integer"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SearchToolsResponse"}}},"description":"Search results"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request (missing query parameter)"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Search for tools","tags":["tools"]}},"/api/v1/info":{"get":{"description":"Get essential server metadata including version, web UI URL, endpoint addresses, and update availability\nThis endpoint is designed for tray-core communication and version checking\nUse refresh=true query parameter to force an immediate update check against GitHub","parameters":[{"description":"Force immediate update check against GitHub","in":"query","name":"refresh","schema":{"type":"boolean"}}],"responses":{"200":{"content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/data"}],"properties":{"data":{"type":"object"},"error":{"type":"string"},"request_id":{"type":"string"},"success":{"type":"boolean"}},"type":"object"}}},"description":"Server information with optional update info"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get server information","tags":["status"]}},"/api/v1/onboarding/mark":{"post":{"description":"Updates wizard engagement and per-step status. Once engaged is\ntrue, the wizard does not auto-show again, even if state regresses.","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/httpapi.OnboardingMarkRequest"}}},"description":"Mark request","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"Updated OnboardingStateResponse"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Mark onboarding wizard state (Spec 046)","tags":["onboarding"]}},"/api/v1/onboarding/state":{"get":{"description":"Returns the wizard engagement record alongside live predicates\n(whether any client is connected, whether any server is configured),\nplus a derived ShouldShowWizard flag the frontend can rely on.","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.APIResponse"}}},"description":"OnboardingStateResponse"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get onboarding wizard state and predicates (Spec 046)","tags":["onboarding"]}},"/api/v1/profiles":{"get":{"description":"List all configured profiles with their effective servers and indexed tool count (Profiles v2). A profile scopes tool discovery and calls to a named subset of upstream servers.","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Profile list"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Configuration unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"List configured profiles","tags":["profiles"]}},"/api/v1/profiles/active":{"get":{"description":"Get the server-level default active profile used by UI surfaces (Web UI / tray). Empty string means \"all servers\". Note: within a live MCP session, the set_profile tool selection takes precedence over this default.","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Active profile"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get the default active profile","tags":["profiles"]},"put":{"description":"Set the server-level default active profile for UI surfaces. The slug must match a configured profile; pass an empty string to clear. This does not affect live MCP sessions, which use the set_profile tool.","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/httpapi.SetActiveProfileRequest"}}},"description":"Profile slug to activate (empty clears)","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Active profile updated"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Invalid request body"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unknown profile"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Set the default active profile","tags":["profiles"]}},"/api/v1/registries":{"get":{"description":"Retrieves list of all MCP server registries that can be browsed for discovering and installing new upstream servers. Includes registry metadata, server counts, and API endpoints.","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GetRegistriesResponse"}}},"description":"Registries retrieved successfully"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to list registries"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"List available MCP server registries","tags":["registries"]},"post":{"description":"Adds a generic modelcontextprotocol/registry v0.1 https endpoint as a custom registry (MCP-866). The source is always tagged custom/unverified, so every server discovered through it lands quarantined and can never skip quarantine.","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.AddRegistrySourceRequest"}}},"description":"Registry source (https url + optional protocol/id/name)","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Registry source added"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"invalid_registry_url"},"403":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"registries_locked"},"409":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"registry_shadows_builtin | duplicate_registry"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Add a user-supplied registry source","tags":["registries"]}},"/api/v1/registries/{id}":{"delete":{"description":"Removes a custom/unverified registry previously added via add-source (MCP-1057). Built-in registries are refused with registry_shadows_builtin; an unknown id yields registry_not_found. The change is persisted copy-on-write.","parameters":[{"description":"Registry ID","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Registry source removed"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Registry ID is required"},"403":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"registries_locked"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"registry_not_found"},"409":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"registry_shadows_builtin"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Remove a user-added custom registry source","tags":["registries"]},"put":{"description":"Updates a custom registry previously added via add-source (MCP-1072): name, url, servers-url. 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The \"changed\" field","parameters":[{"description":"Server ID or name","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"type":"object"}}}},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Operation result"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Enable or disable all tools for a server","tags":["servers"]}},"/api/v1/servers/{id}/unquarantine":{"post":{"description":"Remove a specific upstream MCP server from quarantine to allow tool execution","parameters":[{"description":"Server ID or name","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ServerActionResponse"}}},"description":"Server unquarantined successfully"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request (missing server ID)"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Server not found"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Unquarantine a server","tags":["servers"]}},"/api/v1/sessions":{"get":{"description":"Retrieves paginated list of active and recent MCP client sessions. Each session represents a connection from an MCP client to MCPProxy, tracking initialization time, tool calls, and connection status.","parameters":[{"description":"Maximum number of sessions to return (1-100, default 10)","in":"query","name":"limit","schema":{"type":"integer"}},{"description":"Number of sessions to skip for pagination (default 0)","in":"query","name":"offset","schema":{"type":"integer"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GetSessionsResponse"}}},"description":"Sessions retrieved successfully"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"405":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Method not allowed"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to get sessions"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get active MCP sessions","tags":["sessions"]}},"/api/v1/sessions/{id}":{"get":{"description":"Retrieves detailed information about a specific MCP client session including initialization parameters, connection status, tool call count, and activity timestamps.","parameters":[{"description":"Session ID","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GetSessionDetailResponse"}}},"description":"Session details retrieved successfully"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Session ID required"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Session not found"},"405":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Method not allowed"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get MCP session details by ID","tags":["sessions"]}},"/api/v1/stats/tokens":{"get":{"description":"Retrieve token savings statistics across all servers and sessions","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Token statistics"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get token savings statistics","tags":["stats"]}},"/api/v1/status":{"get":{"description":"Get comprehensive server status including running state, listen address, upstream statistics, and timestamp","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Server status information"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get server status","tags":["status"]}},"/api/v1/telemetry/payload":{"get":{"description":"Render the exact JSON heartbeat payload that mcpproxy would next send to the telemetry endpoint, without making a network call. Counters in the payload reflect the current in-memory state. Spec 042.","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Telemetry heartbeat payload"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Telemetry service unavailable"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Preview next telemetry heartbeat payload","tags":["telemetry"]}},"/api/v1/tool-calls":{"get":{"description":"Retrieves paginated tool call history across all upstream servers or filtered by session ID. Includes execution timestamps, arguments, results, and error information for debugging and auditing.","parameters":[{"description":"Maximum number of records to return (1-100, default 50)","in":"query","name":"limit","schema":{"type":"integer"}},{"description":"Number of records to skip for pagination (default 0)","in":"query","name":"offset","schema":{"type":"integer"}},{"description":"Filter tool calls by MCP session ID","in":"query","name":"session_id","schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GetToolCallsResponse"}}},"description":"Tool calls retrieved successfully"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"405":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Method not allowed"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to get tool calls"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get tool call history","tags":["tool-calls"]}},"/api/v1/tool-calls/{id}":{"get":{"description":"Retrieves detailed information about a specific tool call execution including full request arguments, response data, execution time, and any errors encountered.","parameters":[{"description":"Tool call ID","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GetToolCallDetailResponse"}}},"description":"Tool call details retrieved successfully"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Tool call ID required"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"404":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Tool call not found"},"405":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Method not allowed"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Get tool call details by ID","tags":["tool-calls"]}},"/api/v1/tool-calls/{id}/replay":{"post":{"description":"Re-executes a previous tool call with optional modified arguments. Useful for debugging and testing tool behavior with different inputs. Creates a new tool call record linked to the original.","parameters":[{"description":"Original tool call ID to replay","in":"path","name":"id","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ReplayToolCallRequest"}}},"description":"Optional modified arguments for replay"},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ReplayToolCallResponse"}}},"description":"Tool call replayed successfully"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Tool call ID required or invalid JSON payload"},"401":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Unauthorized - missing or invalid API key"},"405":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Method not allowed"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Failed to replay tool call"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Replay a tool call","tags":["tool-calls"]}},"/api/v1/tools":{"get":{"description":"Consolidated, read-only listing of all tools from every configured server (including disabled servers and disabled/config-denied tools), enriched with approval state and 30-day usage. Backs the global Tools page and the CLI global ` + "`" + `tools list` + "`" + ` (spec 050, issue #437).","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.GlobalToolsResponse"}}},"description":"All tools across all servers"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Could not enumerate servers"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"List every tool across all servers","tags":["tools"]}},"/api/v1/tools/call":{"post":{"description":"Execute a tool on an upstream MCP server (wrapper around MCP tool calls)","requestBody":{"content":{"application/json":{"schema":{"properties":{"arguments":{"type":"object"},"tool_name":{"type":"string"}},"type":"object"}}},"description":"Tool call request with tool name and arguments","required":true},"responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.SuccessResponse"}}},"description":"Tool call result"},"400":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Bad request (invalid payload or missing tool name)"},"500":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/contracts.ErrorResponse"}}},"description":"Internal server error or tool execution failure"}},"security":[{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"summary":"Call a tool","tags":["tools"]}},"/healthz":{"get":{"description":"Get comprehensive health status including all component health (Kubernetes-compatible liveness probe)","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/observability.HealthResponse"}}},"description":"Service is healthy"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/observability.HealthResponse"}}},"description":"Service is unhealthy"}},"summary":"Get health status","tags":["health"]}},"/readyz":{"get":{"description":"Get readiness status including all component readiness checks (Kubernetes-compatible readiness probe)","responses":{"200":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/observability.ReadinessResponse"}}},"description":"Service is ready"},"503":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/observability.ReadinessResponse"}}},"description":"Service is not ready"}},"summary":"Get readiness status","tags":["health"]}}},
     "openapi": "3.1.0"
 }`
 
diff --git a/oas/swagger.yaml b/oas/swagger.yaml
index 3c07a9a9..5178885a 100644
--- a/oas/swagger.yaml
+++ b/oas/swagger.yaml
@@ -2699,6 +2699,21 @@ components:
         profile:
           type: string
       type: object
+    httpapi.UndoConnectRequest:
+      properties:
+        backup_name:
+          description: |-
+            BackupName is the bare filename (filepath.Base) of the backup returned as
+            backup_path by the preceding connect — a name, never a path. Undo resolves
+            the full path server-side by joining it with the client's own config
+            directory, so a client-supplied value can never contribute a directory
+            component (traversal is impossible by construction). Empty means the
+            connect created the file (no prior file existed), so undo removes it.
+          type: string
+        server_name:
+          description: Defaults to "mcpproxy"
+          type: string
+      type: object
     management.BulkOperationResult:
       properties:
         errors:
@@ -3766,6 +3781,78 @@ paths:
       summary: Preview the change a connect would make (no write)
       tags:
       - connect
+  /api/v1/connect/{client}/undo:
+    post:
+      description: |-
+        Reverts the connect that produced the named backup (Spec 078 US3):
+        restores the client config byte-for-byte from that backup, or — when
+        backup_name is empty because the connect created the file — deletes the
+        created file. backup_name is the bare filename of the backup the connect
+        returned (never a path); undo resolves the full path server-side inside
+        the client's own config directory, so a client value cannot escape it.
+        Refuses with 409 when the config changed since the connect (undo never
+        clobbers later edits; use DELETE /connect/{client} for a surgical entry
+        removal instead). Takes its own safety backup first; its path is returned
+        as backup_path in the result.
+      parameters:
+      - description: Client ID (claude-code, claude-desktop, cursor, windsurf, vscode,
+          codex, gemini, opencode)
+        in: path
+        name: client
+        required: true
+        schema:
+          type: string
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/httpapi.UndoConnectRequest'
+        description: Undo parameters (server_name, backup_name = the bare filename
+          of the backup the preceding connect returned)
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/contracts.APIResponse'
+          description: ConnectResult (action restored|deleted)
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/contracts.ErrorResponse'
+          description: Bad request (e.g. backup_name is a path, or not a backup of
+            this client's config)
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/contracts.ErrorResponse'
+          description: Permission denied (macOS App-Data block)
+        "404":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/contracts.ErrorResponse'
+          description: Unknown client or backup no longer exists
+        "409":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/contracts.ErrorResponse'
+          description: Config changed since connect; undo refused
+        "503":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/contracts.ErrorResponse'
+          description: Service unavailable
+      security:
+      - ApiKeyAuth: []
+      - ApiKeyQuery: []
+      summary: Undo a connect, restoring the pre-connect config
+      tags:
+      - connect
   /api/v1/diagnostics:
     get:
       description: Get comprehensive health diagnostics including upstream errors,