diff --git a/packages/agent-mock/src/mock-agent.ts b/packages/agent-mock/src/mock-agent.ts
index 09713d5..0f9da4d 100644
--- a/packages/agent-mock/src/mock-agent.ts
+++ b/packages/agent-mock/src/mock-agent.ts
@@ -103,7 +103,7 @@ export function createMockAgent(mockDataPath: string): () => Promise<void> {
       detailHash,
       sessionId,
       assembledPrompt: "",
-      usage: null,
+      usage: { turns: 1, inputTokens: 0, outputTokens: 0, duration: 0 },
     };
     lastResult = result;
     return result;
diff --git a/packages/cli/src/__tests__/e2e-mock-agent.test.ts b/packages/cli/src/__tests__/e2e-mock-agent.test.ts
index 3d6001e..d05248c 100644
--- a/packages/cli/src/__tests__/e2e-mock-agent.test.ts
+++ b/packages/cli/src/__tests__/e2e-mock-agent.test.ts
@@ -229,6 +229,10 @@ describe("E2E mock-agent: full uwf pipeline", () => {
     expect(getStatus(store, s1.output)).toBe("ready");
     expect(getStatus(store, s2.output)).toBe("done");
 
+    // Mock agent reports usage stats in step nodes.
+    expect(s1.usage).toEqual({ turns: 1, inputTokens: 0, outputTokens: 0, duration: 0 });
+    expect(s2.usage).toEqual({ turns: 1, inputTokens: 0, outputTokens: 0, duration: 0 });
+
     // The start node points at the registered workflow.
     const startNode = store.cas.get(startHash as CasRef);
     expect((startNode!.payload as StartNodePayload).workflow).toBe(workflowHash);