Kiro acp

PATCH.md

@@ -123,6 +123,7 @@ Kiro as a first-class ACP provider, layered on top of upstream's shared ACP infr
 - Dynamic slash commands from `_kiro.dev/commands/available` notifications
 - Context window usage from `_kiro.dev/metadata` notifications
 - Agent selection is persisted per-thread in the composer draft store
+- Subagent crews fan out into collapsible Work-log groups: `_kiro.dev/subagent/list_update` roster transitions become `task.started` / `task.completed` envelopes keyed by the crew's ACP sessionId; per-tool activity inside each crew is pulsed as `task.progress` rows (one per distinct `toolCallId`) with labels formatted as `"{title}: {detail}"` (e.g. `Read file: src/foo.ts`, `Ran command: bun test`). Subagent ContentDelta / AssistantItem / PlanUpdated / ModeChanged events are dropped from the main thread — matching Claude Code's SDK behavior of hiding subagent internals behind task notifications.
 
 ### Server-only additions (new files)
 
@@ -164,7 +165,8 @@ Every shared-file edit is a _pure addition_ (new case in a union, new entry in a
 | `provider/Layers/ProviderAdapterRegistry.ts` | Register `KiroAdapter`                                            |
 | `provider/providerStatusCache.ts`            | Add `"kiro"` to `PROVIDER_CACHE_IDS`                              |
 | `provider/makeManagedServerProvider.ts`      | Add `patchSnapshot` (additive, does not replace `enrichSnapshot`) |
-| `provider/acp/AcpSessionRuntime.ts`          | `authMethodId` made optional (Kiro uses OIDC, skips authenticate) |
+| `provider/acp/AcpSessionRuntime.ts`          | `authMethodId` optional (Kiro uses OIDC); thread `sessionId` through `AssistantSegmentState` + re-emitted `ToolCallUpdated` so subagent events can be filtered out of the main thread |
+| `provider/acp/AcpRuntimeModel.ts`            | `AcpParsedSessionEvent` union gains `sessionId` on every variant so downstream consumers can tell main-session vs subagent events apart |
 | `git/Services/TextGeneration.ts`             | Handle kiro provider kind                                         |
 
 **Web** (`apps/web/src/`):
@@ -247,7 +249,8 @@ Upstream's `makeManagedServerProvider` exposes `enrichSnapshot` for static provi
 | `apps/server/src/server.ts`                             | RuntimeServicesLive layer chain |
 | `apps/server/src/provider/Layers/ProviderRegistry.ts`   | Provider registration list      |
 | `apps/server/src/provider/providerStatusCache.ts`       | `PROVIDER_CACHE_IDS` array      |
-| `apps/server/src/provider/acp/AcpSessionRuntime.ts`     | Optional `authMethodId`         |
+| `apps/server/src/provider/acp/AcpSessionRuntime.ts`     | Optional `authMethodId`; `sessionId` plumbing for subagent filtering |
+| `apps/server/src/provider/acp/AcpRuntimeModel.ts`       | `sessionId` on `AcpParsedSessionEvent` variants  |
 | `apps/server/src/provider/makeManagedServerProvider.ts` | Added `patchSnapshot`           |
 | `apps/web/src/composerDraftStore.ts`                    | Three provider-kind lists       |
 | `apps/web/src/components/settings/SettingsPanels.tsx`   | Provider panel registration     |
@@ -311,6 +314,23 @@ Fork runs in lockstep with upstream (currently Effect v4 beta.45+). If you see t
 
 - Refactor to a single `PROVIDER_KINDS` const tuple exported from contracts to eliminate the three-list hazard permanently (also makes `normalizeProviderModelOptionsWithCapabilities` exhaustiveness-check at compile time).
 
+## Session Reflections (2026-04-20 — round 3: subagent grouping)
+
+### What broke and what fixed it
+
+**Bug: Kiro subagent crews flooded the main chat — one flat stream of "Read file" / "Ran command" / assistant-message rows per subagent, no grouping.**
+
+- Kiro's ACP transport multiplexes `session/update` for the main session *and* every spawned subagent crew over one channel, tagged with `sessionId`. Upstream's `AcpRuntimeModel.parseSessionUpdateEvent` dropped that `sessionId` before reaching the adapter, so everything looked like main-session activity.
+- Fix landed in three passes:
+  1. Thread `sessionId` through `AcpParsedSessionEvent` and `AcpSessionRuntime`, track a roster of in-flight subagents by their ACP sessionId, and translate `_kiro.dev/subagent/list_update` transitions into `task.started` / `task.completed` envelopes. Subagent session/update events are dropped on the main thread.
+  2. Dropping *everything* from subagents made the Work-log look stuck — the group sat silent until the crew terminated. Emit one `task.progress` per distinct subagent `toolCallId` (tracked per-subagent in `seenToolCallIds`) so the Work-log shows live per-tool activity inside the collapsible group, matching Claude Code's native SDK behavior.
+  3. Work-log rows initially rendered only the generic category ("Ran command", "Read file"). Kiro's typed tool-call presentation puts the action in `title` and the payload in `detail`; combine them as `"{title}: {detail}"` via a new `formatSubagentToolLabel` helper so rows show the actual command / path / query. 8 unit tests cover the helper.
+
+### Lessons worth keeping
+
+1. **Multiplexed channels need identity on every event.** Any time a transport fans in multiple logical streams, the parser must preserve the stream identity all the way to the consumer. Dropping it at the parser layer is irreversible downstream.
+2. **"Don't route" is not the same as "don't show".** The first pass filtered subagent events out of main-thread routing entirely; the fix was to keep a single summarized breadcrumb (task.progress per tool call) so the user sees progress without being drowned in subagent internals.
+
 ## Session Reflections (2026-04-20 — round 2)
 
 ### What broke and what fixed it

apps/server/scripts/acp-mock-agent.ts

@@ -248,6 +248,15 @@ const program = Effect.gen(function* () {
       ),
   );
 
+  yield* agent.handleSetSessionModel((request) =>
+    Effect.gen(function* () {
+      if (typeof request.modelId === "string") {
+        currentModelId = request.modelId;
+      }
+      return {};
+    }),
+  );
+
   yield* agent.handleSetSessionConfigOption((request) =>
     Effect.gen(function* () {
       if (exitOnSetConfigOption) {

apps/server/scripts/kiro-mock-agent.ts

@@ -2,7 +2,8 @@
 /**
  * Mock ACP agent that imitates kiro-cli ACP protocol for integration tests.
  *
- * Responds to: initialize, session/new, session/prompt, session/cancel.
+ * Responds to: initialize, session/new, session/prompt, session/cancel,
+ *              session/set_model, session/set_config_option.
  * Emits: session/update (agent_message_chunk), _kiro.dev/metadata extension.
  */
 import * as Effect from "effect/Effect";
@@ -14,6 +15,22 @@ import * as EffectAcpAgent from "effect-acp/agent";
 
 const sessionId = "kiro-mock-session-1";
 
+/** Available models — returned in session responses. */
+const availableModels = ["auto", "claude-sonnet-4-20250514", "claude-opus-4-20250918"];
+let currentModel = "auto";
+
+/** Build the model config option structure used in ACP responses. */
+function makeModelConfigOption(model: string) {
+  return {
+    id: "model",
+    name: "Model",
+    type: "select" as const,
+    category: "model" as const,
+    currentValue: model,
+    options: availableModels.map((m) => ({ value: m, name: m })),
+  };
+}
+
 const program = Effect.gen(function* () {
   const agent = yield* EffectAcpAgent.AcpAgent;
 
@@ -33,13 +50,32 @@ const program = Effect.gen(function* () {
   yield* agent.handleCreateSession(() =>
     Effect.succeed({
       sessionId,
+      configOptions: [makeModelConfigOption(currentModel)],
     }),
   );
 
   yield* agent.handleLoadSession(() => Effect.succeed({}));
 
   yield* agent.handleCancel(() => Effect.void);
 
+  yield* agent.handleSetSessionModel((request) =>
+    Effect.gen(function* () {
+      if (typeof request.modelId === "string") {
+        currentModel = request.modelId;
+      }
+      return {};
+    }),
+  );
+
+  yield* agent.handleSetSessionConfigOption((request) =>
+    Effect.gen(function* () {
+      if (request.configId === "model" && "value" in request && typeof request.value === "string") {
+        currentModel = request.value;
+      }
+      return { configOptions: [makeModelConfigOption(currentModel)] };
+    }),
+  );
+
   yield* agent.handlePrompt((request) =>
     Effect.gen(function* () {
       const requestedSessionId = String(request.sessionId ?? sessionId);

apps/server/src/provider/Layers/KiroAdapter.integration.test.ts

@@ -341,4 +341,141 @@ describe("KiroAdapterLive integration", () => {
         yield* adapter.stopSession(threadId);
       }).pipe(Effect.scoped, Effect.provide(adapterLayer)),
   );
+
+  it.effect(
+    "switches model in-session without restarting the process",
+    () =>
+      Effect.gen(function* () {
+        const adapter = yield* KiroAdapter;
+        const threadId = ThreadId.make("kiro-int-model-switch-1");
+
+        yield* adapter.startSession({
+          threadId,
+          provider: "kiro",
+          cwd: process.cwd(),
+          runtimeMode: "full-access",
+          modelSelection: { provider: "kiro", model: "auto" },
+        });
+
+        const spawnCountAfterStart = capturedArgs.length;
+
+        // First turn with default model
+        yield* adapter.sendTurn({
+          threadId,
+          input: "first turn",
+          attachments: [],
+        });
+
+        // Second turn with different model — should NOT respawn
+        yield* adapter.sendTurn({
+          threadId,
+          input: "second turn after model switch",
+          attachments: [],
+          modelSelection: {
+            provider: "kiro",
+            model: "claude-sonnet-4-20250514",
+          },
+        });
+
+        // Session should NOT have been restarted — only one spawn
+        expect(capturedArgs.length).toBe(spawnCountAfterStart);
+
+        yield* adapter.stopSession(threadId);
+      }).pipe(Effect.scoped, Effect.provide(adapterLayer)),
+  );
+
+  it.effect(
+    "updates session.model immediately after in-session model switch",
+    () =>
+      Effect.gen(function* () {
+        const adapter = yield* KiroAdapter;
+        const threadId = ThreadId.make("kiro-int-model-state-1");
+
+        const session = yield* adapter.startSession({
+          threadId,
+          provider: "kiro",
+          cwd: process.cwd(),
+          runtimeMode: "full-access",
+          modelSelection: { provider: "kiro", model: "auto" },
+        });
+
+        expect(session.model).toBe("auto");
+
+        // Collect turn.started events to verify model is correct
+        const eventsFiber = yield* adapter.streamEvents.pipe(
+          Stream.filter(
+            (event) => event.type === "turn.started" || event.type === "turn.completed",
+          ),
+          Stream.take(2), // turn.started + turn.completed for the model-switch turn
+          Stream.runCollect,
+          Effect.forkChild,
+        );
+
+        // Send turn with new model
+        const turn = yield* adapter.sendTurn({
+          threadId,
+          input: "switch model turn",
+          attachments: [],
+          modelSelection: {
+            provider: "kiro",
+            model: "claude-sonnet-4-20250514",
+          },
+        });
+
+        expect(turn.threadId).toBe(threadId);
+
+        const events = yield* Fiber.join(eventsFiber);
+        const turnStarted = events.find((e) => e.type === "turn.started");
+        expect(turnStarted).toBeDefined();
+        if (turnStarted?.type === "turn.started") {
+          expect(turnStarted.payload.model).toBe("claude-sonnet-4-20250514");
+        }
+
+        // Verify session state reflects the new model
+        const sessions = yield* adapter.listSessions();
+        const currentSession = sessions.find((s) => s.threadId === threadId);
+        expect(currentSession?.model).toBe("claude-sonnet-4-20250514");
+
+        yield* adapter.stopSession(threadId);
+      }).pipe(Effect.scoped, Effect.provide(adapterLayer)),
+  );
+
+  it.effect(
+    "does not call setModel when model is unchanged between turns",
+    () =>
+      Effect.gen(function* () {
+        const adapter = yield* KiroAdapter;
+        const threadId = ThreadId.make("kiro-int-model-unchanged-1");
+
+        yield* adapter.startSession({
+          threadId,
+          provider: "kiro",
+          cwd: process.cwd(),
+          runtimeMode: "full-access",
+          modelSelection: { provider: "kiro", model: "auto" },
+        });
+
+        // Two turns with the same model — should not trigger setModel
+        yield* adapter.sendTurn({
+          threadId,
+          input: "first turn",
+          attachments: [],
+          modelSelection: { provider: "kiro", model: "auto" },
+        });
+
+        yield* adapter.sendTurn({
+          threadId,
+          input: "second turn same model",
+          attachments: [],
+          modelSelection: { provider: "kiro", model: "auto" },
+        });
+
+        // Both turns should succeed without issues (no setModel called)
+        const sessions = yield* adapter.listSessions();
+        const currentSession = sessions.find((s) => s.threadId === threadId);
+        expect(currentSession?.model).toBe("auto");
+
+        yield* adapter.stopSession(threadId);
+      }).pipe(Effect.scoped, Effect.provide(adapterLayer)),
+  );
 });