fix(babysitter): avoid double prompt gate

src/plugin/unstable-agent-babysitter.test.ts

@@ -0,0 +1,86 @@
+import { afterEach, describe, expect, test } from "bun:test"
+import { createUnstableAgentBabysitter } from "./unstable-agent-babysitter"
+import type { BackgroundTask } from "../features/background-agent"
+import { _resetForTesting, setMainSession } from "../features/claude-code-session-state"
+import { releaseAllPromptAsyncReservationsForTesting } from "../hooks/shared/prompt-async-gate"
+import { unsafeTestValue } from "../../test-support/unsafe-test-value"
+
+function createTask(): BackgroundTask {
+  return {
+    id: "task-1",
+    sessionId: "bg-1",
+    parentSessionId: "main-1",
+    parentMessageId: "msg-1",
+    description: "unstable task",
+    prompt: "run work",
+    agent: "test-agent",
+    status: "running",
+    progress: {
+      toolCalls: 1,
+      lastUpdate: new Date(Date.now() - 121000),
+      lastMessage: "still working",
+      lastMessageAt: new Date(Date.now() - 121000),
+    },
+    model: { providerID: "google", modelID: "gemini-1.5" },
+  }
+}
+
+describe("createUnstableAgentBabysitter", () => {
+  afterEach(() => {
+    _resetForTesting()
+    releaseAllPromptAsyncReservationsForTesting()
+  })
+
+  test("#given wrapper-created babysitter hook #when injecting a stale-task reminder #then the real SDK promptAsync is called once", async () => {
+    // given
+    setMainSession("main-1")
+    const promptAsyncCalls: unknown[] = []
+    const babysitter = createUnstableAgentBabysitter({
+      ctx: unsafeTestValue({
+        directory: process.cwd(),
+        client: {
+          session: {
+            messages: async ({ path }: { path: { id: string } }) => ({
+              data: path.id === "main-1"
+                ? [
+                    {
+                      info: {
+                        role: "assistant",
+                        agent: "sisyphus",
+                        model: { providerID: "openai", modelID: "gpt-4" },
+                      },
+                    },
+                  ]
+                : [
+                    {
+                      info: { role: "assistant" },
+                      parts: [{ type: "thinking", thinking: "deep thought" }],
+                    },
+                  ],
+            }),
+            status: async () => ({ data: { "main-1": { type: "idle" } } }),
+            promptAsync: async (input: unknown) => {
+              promptAsyncCalls.push(input)
+              return {}
+            },
+          },
+        },
+      }),
+      backgroundManager: unsafeTestValue({
+        getTasksByParentSession: () => [createTask()],
+      }),
+      pluginConfig: unsafeTestValue({ babysitting: { timeout_ms: 120000 } }),
+    })
+
+    // when
+    await babysitter.event({
+      event: {
+        type: "session.idle",
+        properties: { sessionID: "main-1" },
+      },
+    })
+
+    // then
+    expect(promptAsyncCalls).toHaveLength(1)
+  })
+})

src/plugin/unstable-agent-babysitter.ts

@@ -3,7 +3,6 @@ import type { PluginContext } from "./types"
 
 import { createUnstableAgentBabysitterHook } from "../hooks"
 import type { BackgroundManager } from "../features/background-agent"
-import { dispatchInternalPrompt } from "../hooks/shared/prompt-async-gate"
 
 export function createUnstableAgentBabysitter(args: {
   ctx: PluginContext
@@ -26,30 +25,8 @@ export function createUnstableAgentBabysitter(args: {
             return []
           },
           status: async () => ctx.client.session.status(),
-          prompt: async (promptArgs) => {
-            const promptResult = await dispatchInternalPrompt({
-              mode: "async",
-              client: ctx.client,
-              sessionID: promptArgs.path.id,
-              source: "unstable-agent-babysitter",
-              input: promptArgs,
-            })
-            if (promptResult.status === "failed") {
-              throw promptResult.error
-            }
-          },
-          promptAsync: async (promptArgs) => {
-            const promptResult = await dispatchInternalPrompt({
-              mode: "async",
-              client: ctx.client,
-              sessionID: promptArgs.path.id,
-              source: "unstable-agent-babysitter",
-              input: promptArgs,
-            })
-            if (promptResult.status === "failed") {
-              throw promptResult.error
-            }
-          },
+          prompt: async (promptArgs) => ctx.client.session.prompt(promptArgs),
+          promptAsync: async (promptArgs) => ctx.client.session.promptAsync(promptArgs),
         },
       },
     },

src/shared/prompt-async-route-audit.test.ts

@@ -14,6 +14,10 @@ const RAW_PROMPT_ALLOWLIST = new Map<string, string>([
     path.join(SOURCE_ROOT, "plugin", "build-team-idle-wake-hint-client.ts"),
     "binds SDK Session.promptAsync/.status into a narrow facade consumed only by gate-routed team-idle-wake-hint dispatch; performs no direct dispatch itself",
   ],
+  [
+    path.join(SOURCE_ROOT, "plugin", "unstable-agent-babysitter.ts"),
+    "binds SDK Session.prompt/.promptAsync into a narrow facade consumed only by gate-routed unstable-agent-babysitter dispatch; performs no direct dispatch itself",
+  ],
   [
     path.join(SOURCE_ROOT, "hooks", "session-recovery", "recover-unavailable-tool.ts"),
     "runtime type guard checks promptAsync presence before gate-routed dispatchInternalPrompt",