diff --git a/electron/coding-runtime/pi/runtime.ts b/electron/coding-runtime/pi/runtime.ts
index 46b3a6c..894d604 100644
--- a/electron/coding-runtime/pi/runtime.ts
+++ b/electron/coding-runtime/pi/runtime.ts
@@ -125,6 +125,7 @@ export interface PiWorkerProcessAdapter {
   subscribeInvalidation(listener: (error: PiProcessError) => void): () => void;
   stop(reason: PiWorkerStopReason): Promise<PiWorkerStopResult>;
   injectFailureForProof?(failure: PiWorkerProofFailure): Promise<void>;
+  delayNextResponseForProof?(commandType: string, delayMs: number): void;
 }
 
 export interface PiManagedProviderInput {
@@ -193,6 +194,13 @@ class ManagedPiConversationWorker implements PiConversationWorker {
     }
     await this.process.injectFailureForProof(failure);
   }
+
+  delayNextResponseForProof(commandType: string, delayMs: number): void {
+    if (!this.process.delayNextResponseForProof) {
+      throw new Error('Managed Pi process does not support proof response delay');
+    }
+    this.process.delayNextResponseForProof(commandType, delayMs);
+  }
 }
 
 export function createPiManagedWorkerOpener(
diff --git a/tests/unit/pi-managed-worker-opener.test.ts b/tests/unit/pi-managed-worker-opener.test.ts
index cf0457c..ff12cfe 100644
--- a/tests/unit/pi-managed-worker-opener.test.ts
+++ b/tests/unit/pi-managed-worker-opener.test.ts
@@ -34,6 +34,7 @@ const NOW = '2026-08-22T16:00:00.000Z';
 
 class OpenerFakeProcess implements PiWorkerProcessAdapter {
   readonly generation = 1;
+  readonly proofResponseDelays: Array<{ commandType: string; delayMs: number }> = [];
   constructor(
     private readonly sessionId: string,
     private readonly options: PiWorkerProcessOptions,
@@ -60,6 +61,9 @@ class OpenerFakeProcess implements PiWorkerProcessAdapter {
 
   subscribe(_listener: (event: PiRpcEvent) => void): () => void { return () => undefined; }
   subscribeInvalidation(_listener: (error: PiProcessError) => void): () => void { return () => undefined; }
+  delayNextResponseForProof(commandType: string, delayMs: number): void {
+    this.proofResponseDelays.push({ commandType, delayMs });
+  }
   async stop() { return { mode: 'stdin-close' as const, code: 0, signal: null }; }
 }
 
@@ -120,6 +124,7 @@ describe('managed Pi worker opener', () => {
       updatedAt: NOW,
     };
     const processOptions: PiWorkerProcessOptions[] = [];
+    const processes: OpenerFakeProcess[] = [];
     const telemetry: PiRuntimeTelemetryEvent[] = [];
     const registry = new PiSessionRegistry({ projectStore });
     const extensionHost = new PiManagedExtensionHost();
@@ -140,7 +145,9 @@ describe('managed Pi worker opener', () => {
       createProcess: (options) => {
         processOptions.push(options);
         const sessionIndex = options.additionalArgs?.indexOf('--session-id') ?? -1;
-        return new OpenerFakeProcess(options.additionalArgs?.[sessionIndex + 1] ?? '', options);
+        const process = new OpenerFakeProcess(options.additionalArgs?.[sessionIndex + 1] ?? '', options);
+        processes.push(process);
+        return process;
       },
     });
     const opener = createOpener(registry);
@@ -200,6 +207,9 @@ describe('managed Pi worker opener', () => {
     expect(JSON.stringify(telemetry)).not.toContain(created.id);
     expect(JSON.stringify(telemetry)).not.toContain('PRIVATE MANAGED PROMPT');
     expect(JSON.stringify(telemetry)).not.toContain('provider-secret-value');
+    expect(first.worker.delayNextResponseForProof).toBeTypeOf('function');
+    first.worker.delayNextResponseForProof?.('prompt', 12_000);
+    expect(processes[0]?.proofResponseDelays).toEqual([{ commandType: 'prompt', delayMs: 12_000 }]);
     await first.worker.stop('test_injection');
     await reopened.worker.stop('test_injection');
     await restarted.worker.stop('test_injection');