feat(composer): add provider slash commands and skills

apps/server/probe-claude.mjs

@@ -0,0 +1,43 @@
+import { query } from "@anthropic-ai/claude-agent-sdk";
+
+function waitForAbortSignal(signal) {
+  if (signal.aborted) return Promise.resolve();
+  return new Promise((resolve) => {
+    signal.addEventListener("abort", () => resolve(), { once: true });
+  });
+}
+
+const abort = new AbortController();
+
+const q = query({
+  prompt: (async function* () {
+    await waitForAbortSignal(abort.signal);
+  })(),
+  options: {
+    persistSession: false,
+    pathToClaudeCodeExecutable: "/Users/tyulyukov/.local/bin/claude",
+    abortController: abort,
+    settingSources: ["user", "project", "local"],
+    allowedTools: [],
+    stderr: (line) => {
+      console.error("[claude stderr]", line);
+    },
+  },
+});
+
+const timeoutId = setTimeout(() => {
+  console.error("TIMEOUT after 10s");
+  abort.abort();
+}, 10000);
+
+try {
+  const init = await q.initializationResult();
+  console.log("subscriptionType:", init.account?.subscriptionType);
+  console.log("commands count:", init.commands?.length);
+  console.log("commands:", JSON.stringify(init.commands?.slice(0, 20), null, 2));
+} catch (err) {
+  console.error("ERROR:", err);
+} finally {
+  clearTimeout(timeoutId);
+  if (!abort.signal.aborted) abort.abort();
+}

apps/server/src/provider/Layers/ClaudeAdapter.ts

@@ -2939,6 +2939,13 @@ const makeClaudeAdapter = Effect.fn("makeClaudeAdapter")(function* (
         ...(fastMode ? { fastMode: true } : {}),
       };
 
+      const computedAdditionalDirs = (() => {
+        const dirs: string[] = [];
+        if (input.cwd) dirs.push(input.cwd);
+        if (input.additionalDirectories) dirs.push(...input.additionalDirectories);
+        return [...new Set(dirs)];
+      })();
+
       const queryOptions: ClaudeQueryOptions = {
         ...(input.cwd ? { cwd: input.cwd } : {}),
         ...(apiModelId ? { model: apiModelId } : {}),
@@ -2955,13 +2962,9 @@ const makeClaudeAdapter = Effect.fn("makeClaudeAdapter")(function* (
         includePartialMessages: true,
         canUseTool,
         env: process.env,
-        ...(() => {
-          const dirs: string[] = [];
-          if (input.cwd) dirs.push(input.cwd);
-          if (input.additionalDirectories) dirs.push(...input.additionalDirectories);
-          const uniqueDirs = [...new Set(dirs)];
-          return uniqueDirs.length > 0 ? { additionalDirectories: uniqueDirs } : {};
-        })(),
+        ...(computedAdditionalDirs.length > 0
+          ? { additionalDirectories: computedAdditionalDirs }
+          : {}),
       };
 
       const queryRuntime = yield* Effect.try({

apps/server/src/provider/Layers/ClaudeProvider.ts

@@ -13,6 +13,7 @@ import { decodeJsonResult } from "@marcode/shared/schemaJson";
 import {
   query as claudeQuery,
   type SlashCommand as ClaudeSlashCommand,
+  type SDKUserMessage,
 } from "@anthropic-ai/claude-agent-sdk";
 
 import {
@@ -454,13 +455,24 @@ function dedupeSlashCommands(
   return [...commandsByName.values()];
 }
 
+function waitForAbortSignal(signal: AbortSignal): Promise<void> {
+  if (signal.aborted) {
+    return Promise.resolve();
+  }
+  return new Promise((resolve) => {
+    signal.addEventListener("abort", () => resolve(), { once: true });
+  });
+}
+
 /**
  * Probe account information by spawning a lightweight Claude Agent SDK
  * session and reading the initialization result.
  *
- * The prompt is never sent to the Anthropic API — we abort immediately
- * after the local initialization phase completes. This gives us the
- * user's subscription type without incurring any token cost.
+ * We pass a never-yielding AsyncIterable as the prompt so that no user
+ * message is ever written to the subprocess stdin. This means the Claude
+ * Code subprocess completes its local initialization IPC (returning
+ * account info and slash commands) but never starts an API request to
+ * Anthropic. We read the init data and then abort the subprocess.
  *
  * This is used as a fallback when `claude auth status` does not include
  * subscription type information.
@@ -469,12 +481,16 @@ const probeClaudeCapabilities = (binaryPath: string) => {
   const abort = new AbortController();
   return Effect.tryPromise(async () => {
     const q = claudeQuery({
-      prompt: ".",
+      // Never yield — we only need initialization data, not a conversation.
+      // This prevents any prompt from reaching the Anthropic API.
+      // oxlint-disable-next-line require-yield
+      prompt: (async function* (): AsyncGenerator<SDKUserMessage> {
+        await waitForAbortSignal(abort.signal);
+      })(),
       options: {
         persistSession: false,
         pathToClaudeCodeExecutable: binaryPath,
         abortController: abort,
-        maxTurns: 0,
         settingSources: ["user", "project", "local"],
         allowedTools: [],
         stderr: () => {},

apps/server/src/ws.ts

@@ -389,6 +389,18 @@ const makeWsRpcLayer = (currentSessionId: AuthSessionId) =>
                 createdAt: bootstrap.createThread.createdAt,
               });
               createdThread = true;
+
+              if (
+                bootstrap.createThread.additionalDirectories &&
+                bootstrap.createThread.additionalDirectories.length > 0
+              ) {
+                yield* orchestrationEngine.dispatch({
+                  type: "thread.meta.update",
+                  commandId: serverCommandId("bootstrap-thread-additional-directories"),
+                  threadId: command.threadId,
+                  additionalDirectories: bootstrap.createThread.additionalDirectories,
+                });
+              }
             }
 
             if (bootstrap?.prepareWorktree) {
@@ -927,11 +939,12 @@ const makeWsRpcLayer = (currentSessionId: AuthSessionId) =>
                 })),
               );
 
+              const initialConfig = yield* loadServerConfig;
               return Stream.concat(
                 Stream.make({
                   version: 1 as const,
                   type: "snapshot" as const,
-                  config: yield* loadServerConfig,
+                  config: initialConfig,
                 }),
                 Stream.merge(keybindingsUpdates, Stream.merge(providerStatuses, settingsUpdates)),
               );

apps/web/src/components/ChatView.logic.test.ts

@@ -483,7 +483,6 @@ describe("hasServerAcknowledgedLocalDispatch", () => {
         localDispatch,
         phase: "ready",
         latestTurn: previousLatestTurn,
-        session: previousSession,
         hasPendingApproval: false,
         hasPendingUserInput: false,
         threadError: null,
@@ -528,7 +527,6 @@ describe("hasServerAcknowledgedLocalDispatch", () => {
           startedAt: "2026-03-29T00:01:01.000Z",
           completedAt: "2026-03-29T00:01:30.000Z",
         },
-        session: null,
         hasPendingApproval: false,
         hasPendingUserInput: false,
         threadError: null,
@@ -567,7 +565,6 @@ describe("hasServerAcknowledgedLocalDispatch", () => {
         localDispatch,
         phase: "ready",
         latestTurn: previousLatestTurn,
-        session: previousSession,
         hasPendingApproval: false,
         hasPendingUserInput: false,
         threadError: null,

apps/web/src/components/ChatView.logic.ts

@@ -13,7 +13,6 @@ import {
   type ChatMessage,
   type SessionPhase,
   type Thread,
-  type ThreadSession,
 } from "../types";
 import { randomUUID } from "~/lib/utils";
 import { type ComposerImageAttachment, type DraftThreadState } from "../composerDraftStore";
@@ -313,33 +312,27 @@ export interface LocalDispatchSnapshot {
   latestTurnRequestedAt: string | null;
   latestTurnStartedAt: string | null;
   latestTurnCompletedAt: string | null;
-  sessionOrchestrationStatus: ThreadSession["orchestrationStatus"] | null;
-  sessionUpdatedAt: string | null;
 }
 
 export function createLocalDispatchSnapshot(
   activeThread: Thread | undefined,
   options?: { preparingWorktree?: boolean },
 ): LocalDispatchSnapshot {
   const latestTurn = activeThread?.latestTurn ?? null;
-  const session = activeThread?.session ?? null;
   return {
     startedAt: new Date().toISOString(),
     preparingWorktree: Boolean(options?.preparingWorktree),
     latestTurnTurnId: latestTurn?.turnId ?? null,
     latestTurnRequestedAt: latestTurn?.requestedAt ?? null,
     latestTurnStartedAt: latestTurn?.startedAt ?? null,
     latestTurnCompletedAt: latestTurn?.completedAt ?? null,
-    sessionOrchestrationStatus: session?.orchestrationStatus ?? null,
-    sessionUpdatedAt: session?.updatedAt ?? null,
   };
 }
 
 export function hasServerAcknowledgedLocalDispatch(input: {
   localDispatch: LocalDispatchSnapshot | null;
   phase: SessionPhase;
   latestTurn: Thread["latestTurn"] | null;
-  session: Thread["session"] | null;
   hasPendingApproval: boolean;
   hasPendingUserInput: boolean;
   threadError: string | null | undefined;
@@ -357,15 +350,12 @@ export function hasServerAcknowledgedLocalDispatch(input: {
   }
 
   const latestTurn = input.latestTurn ?? null;
-  const session = input.session ?? null;
 
   return (
     input.localDispatch.latestTurnTurnId !== (latestTurn?.turnId ?? null) ||
     input.localDispatch.latestTurnRequestedAt !== (latestTurn?.requestedAt ?? null) ||
     input.localDispatch.latestTurnStartedAt !== (latestTurn?.startedAt ?? null) ||
-    input.localDispatch.latestTurnCompletedAt !== (latestTurn?.completedAt ?? null) ||
-    input.localDispatch.sessionOrchestrationStatus !== (session?.orchestrationStatus ?? null) ||
-    input.localDispatch.sessionUpdatedAt !== (session?.updatedAt ?? null)
+    input.localDispatch.latestTurnCompletedAt !== (latestTurn?.completedAt ?? null)
   );
 }