diff --git a/src/cli/handlers/orchestration/dispatch-handlers.ts b/src/cli/handlers/orchestration/dispatch-handlers.ts
index afe79ab8e2f3..0530049b8298 100644
--- a/src/cli/handlers/orchestration/dispatch-handlers.ts
+++ b/src/cli/handlers/orchestration/dispatch-handlers.ts
@@ -17,6 +17,8 @@ export const ORCHESTRATION_DISPATCH_HANDLER: Record<string, CommandHandler> = {
     const result = await callOrchestrationMutation<{
       dispatch: { id: string; task_id: string; status: string } | null
       injected?: boolean
+      /** The preamble landed but the agent's turn start was not observed; do not re-inject. */
+      promptUnobserved?: boolean
       dryRun?: boolean
       preamble?: string
     }>(client, flags, 'orchestration.dispatch', {
@@ -34,7 +36,12 @@ export const ORCHESTRATION_DISPATCH_HANDLER: Record<string, CommandHandler> = {
         return value.preamble ?? ''
       }
       const base = `Dispatched ${value.dispatch?.task_id} -> ${value.dispatch?.id} [${value.dispatch?.status}]`
-      return value.preamble ? `${base}\n\n--- Preamble ---\n${value.preamble}` : base
+      const unobserved = value.promptUnobserved
+        ? `\nThe preamble was injected but the agent's turn start was not observed. It is in the composer; read the terminal before re-sending anything.`
+        : ''
+      return value.preamble
+        ? `${base}${unobserved}\n\n--- Preamble ---\n${value.preamble}`
+        : `${base}${unobserved}`
     })
   }
 }
diff --git a/src/main/runtime/rpc/methods/orchestration-dispatch-methods.ts b/src/main/runtime/rpc/methods/orchestration-dispatch-methods.ts
index ae21a4e5a466..66b9e5f866ba 100644
--- a/src/main/runtime/rpc/methods/orchestration-dispatch-methods.ts
+++ b/src/main/runtime/rpc/methods/orchestration-dispatch-methods.ts
@@ -3,6 +3,7 @@ import { OrchestrationError } from '../../orchestration/orchestration-error'
 import { buildDispatchPreamble } from '../../orchestration/preamble'
 import { resolveDispatchCreator } from './orchestration-dispatch-creator'
 import { buildInjectRejectionMessage } from './orchestration-inject-rejection-message'
+import { isAgentPromptStalledError } from '../../agent-prompt-submission-verification'
 import { resolveRunScope } from './orchestration-run-scope'
 import { DispatchParams, DispatchShowParams } from './orchestration-schemas'
 
@@ -123,21 +124,35 @@ export const ORCHESTRATION_DISPATCH_METHODS: RpcMethod[] = [
       })
 
       let injected = false
+      let promptUnobserved = false
       if (params.inject) {
         try {
           await runtime.sendTerminalAgentPrompt(to, preamble)
           injected = true
         } catch (err) {
-          db.failDispatch(ctx.id, err instanceof Error ? err.message : String(err))
-          throw err
+          // Why (#17066): the preamble is in the pane before verification runs, so a stall is an
+          // unobserved turn start, never proof it is missing. Failing here would revoke the capability
+          // the worker's heartbeat and worker_done need while it is already executing the task.
+          if (isAgentPromptStalledError(err)) {
+            injected = true
+            promptUnobserved = true
+            console.warn(
+              `[orchestration] dispatch ${ctx.id}: preamble injected into ${to} but its turn start was not observed; dispatch stays active`
+            )
+          } else {
+            db.failDispatch(ctx.id, err instanceof Error ? err.message : String(err))
+            throw err
+          }
         }
       }
 
       // Why: returnPreamble is opt-in because the preamble is several hundred bytes most callers don't need in the response.
-      if (params.returnPreamble) {
-        return { dispatch: ctx, injected, preamble }
+      return {
+        dispatch: ctx,
+        injected,
+        ...(promptUnobserved ? { promptUnobserved } : {}),
+        ...(params.returnPreamble ? { preamble } : {})
       }
-      return { dispatch: ctx, injected }
     }
   }),
 
diff --git a/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts b/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts
index a216b4c7a4df..cd749d4f7c6a 100644
--- a/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts
+++ b/src/main/runtime/rpc/methods/orchestration-tasks-dispatch.test.ts
@@ -327,6 +327,33 @@ describe('orchestration RPC methods', () => {
       expect(db.getActiveDispatchForTerminal('term_a')).toBeUndefined()
     })
 
+    it('keeps an injected dispatch active when the turn start is not observed', async () => {
+      setup()
+      provideInjectIdentity()
+      const task = db.createTask({ spec: 'work' })
+      vi.spyOn(runtime, 'isTerminalRunningAgent').mockResolvedValue(true)
+      vi.spyOn(runtime, 'sendTerminalAgentPrompt').mockRejectedValue(
+        new Error('agent_prompt_stalled')
+      )
+      vi.spyOn(console, 'warn').mockImplementation(() => {})
+
+      const result = (await call('orchestration.dispatch', {
+        task: task.id,
+        to: 'term_a',
+        inject: true
+      })) as {
+        dispatch: { id: string; status: string }
+        injected: boolean
+        promptUnobserved?: boolean
+      }
+
+      // Why: the preamble is in the composer; revoking here rejects the worker's own worker_done.
+      expect(result).toMatchObject({ injected: true, promptUnobserved: true })
+      expect(result.dispatch.status).toBe('dispatched')
+      expect(db.getTask(task.id)?.status).toBe('dispatched')
+      expect(db.getDispatchContextById(result.dispatch.id)?.capability_revoked_at).toBeNull()
+    })
+
     it('uses caller-provided dev mode for injected preamble', async () => {
       setup()
       provideInjectIdentity()