diff --git a/packages/core/src/agents/runtime/agent-core.test.ts b/packages/core/src/agents/runtime/agent-core.test.ts
index 33b34d5aa5e..9e4b0a577fb 100644
--- a/packages/core/src/agents/runtime/agent-core.test.ts
+++ b/packages/core/src/agents/runtime/agent-core.test.ts
@@ -15,6 +15,13 @@ import {
   type RuntimeContentGeneratorView,
 } from './agent-context.js';
 import { subagentNameContext } from '../../utils/subagentNameContext.js';
+import {
+  getAgentName,
+  getTeammateContext,
+  isTeammate,
+  runWithTeammateIdentity,
+} from '../team/identity.js';
+import type { TeammateIdentity } from '../team/types.js';
 import type { Config } from '../../config/config.js';
 import type {
   ModelConfig,
@@ -213,6 +220,48 @@ describe('AgentCore.runInAgentFrames', () => {
     expect(observedAgentId).toBe('agent-123');
   });
 
+  it('restores the teammate identity for deferred-approval continuations', async () => {
+    // Regression: a teammate's `send_message`/`task_update` that requires
+    // confirmation resumes from the UI's async chain, outside the
+    // teammate identity frame TeamManager established. Before the fix,
+    // `getAgentName()` returned undefined there and send_message fell back
+    // to the leader — forging a `from="leader"` envelope and slipping past
+    // the leader-only `isTeammate()` guard. The respond closure must carry
+    // the identity captured at emit time back into the resumed tool body.
+    const core = makeCore('approval-agent');
+    const teammateIdentity: TeammateIdentity = {
+      agentId: 'scribe@demo',
+      agentName: 'scribe',
+      teamName: 'demo',
+      isTeamLead: false,
+    };
+
+    let respondClosure: (() => Promise<void>) | undefined;
+    let observedAgentName: string | undefined;
+    let observedIsTeammate: boolean | undefined;
+    const onConfirm = async () => {
+      observedAgentName = getAgentName();
+      observedIsTeammate = isTeammate();
+    };
+
+    // Simulate the teammate's loop frame being live at emit time.
+    await runWithTeammateIdentity(teammateIdentity, async () => {
+      const inherited = getTeammateContext();
+      respondClosure = () =>
+        core.runInAgentFrames(onConfirm, undefined, undefined, inherited);
+    });
+
+    // Teammate frame is gone; jump to a fresh microtask chain to be sure.
+    expect(getAgentName()).toBeUndefined();
+    expect(isTeammate()).toBe(false);
+    await new Promise((resolve) => setImmediate(resolve));
+
+    await respondClosure!();
+
+    expect(observedAgentName).toBe('scribe');
+    expect(observedIsTeammate).toBe(true);
+  });
+
   it("prefers the agent's own view over inheritedView when both are present", async () => {
     // Defensive: if a future caller wires both, the agent's explicit view
     // wins — we never want a captured snapshot to override the agent's
diff --git a/packages/core/src/agents/runtime/agent-core.ts b/packages/core/src/agents/runtime/agent-core.ts
index 396d273956e..08f99a2487e 100644
--- a/packages/core/src/agents/runtime/agent-core.ts
+++ b/packages/core/src/agents/runtime/agent-core.ts
@@ -76,7 +76,12 @@ import { matchesMcpPattern } from '../../permissions/rule-parser.js';
 import { ToolNames } from '../../tools/tool-names.js';
 import { DEFAULT_QWEN_MODEL } from '../../config/models.js';
 import { type ContextState, templateString } from './agent-headless.js';
-import { isTeammate } from '../team/identity.js';
+import {
+  isTeammate,
+  getTeammateContext,
+  runWithTeammateIdentity,
+} from '../team/identity.js';
+import type { TeammateIdentity } from '../team/types.js';
 
 /**
  * Result of a single reasoning loop invocation.
@@ -572,6 +577,15 @@ export class AgentCore {
    * from the parent UI chain, after the subagent's AsyncLocalStorage frame
    * has unwound.
    *
+   * `inheritedTeammateIdentity` restores the in-process teammate identity
+   * frame (`teammateIdentityStore`). Deferred approval needs it for the
+   * same reason as the others: when a teammate's `send_message` /
+   * `task_update` resumes from the UI chain, `getAgentName()` would
+   * otherwise be undefined and the tool would mis-attribute the message
+   * to the leader (forged `from="leader"` envelope) and slip past the
+   * leader-only `isTeammate()` guard. No-op on the reasoning-loop path,
+   * where TeamManager already establishes this frame.
+   *
    * Exposed (rather than inlined twice) so the contract stays testable in
    * isolation; see `agent-core.test.ts`.
    */
@@ -579,13 +593,18 @@ export class AgentCore {
     fn: () => Promise<T>,
     inheritedView?: RuntimeContentGeneratorView,
     inheritedAgentId?: string,
+    inheritedTeammateIdentity?: TeammateIdentity,
   ): Promise<T> {
-    return subagentNameContext.run(this.name, () => {
-      const runWithView = () => this.withRuntimeView(fn, inheritedView);
-      return inheritedAgentId
-        ? runWithAgentContext(inheritedAgentId, runWithView)
-        : runWithView();
-    });
+    const runInner = () =>
+      subagentNameContext.run(this.name, () => {
+        const runWithView = () => this.withRuntimeView(fn, inheritedView);
+        return inheritedAgentId
+          ? runWithAgentContext(inheritedAgentId, runWithView)
+          : runWithView();
+      });
+    return inheritedTeammateIdentity
+      ? runWithTeammateIdentity(inheritedTeammateIdentity, runInner)
+      : runInner();
   }
 
   /**
@@ -1243,6 +1262,11 @@ export class AgentCore {
             // restore it. See `runInAgentFrames` for the wiring.
             const inheritedView = getRuntimeContentGenerator();
             const inheritedAgentId = getCurrentAgentId();
+            // Capture the teammate identity frame too, while the loop
+            // frame is still live, so the deferred-approval continuation
+            // can restore it. See `runInAgentFrames` for why this matters
+            // (mis-attributed `from="leader"` + leader-guard bypass).
+            const inheritedTeammateIdentity = getTeammateContext();
             this.eventEmitter?.emit(AgentEventType.TOOL_WAITING_APPROVAL, {
               subagentId: this.subagentId,
               round: currentRound,
@@ -1272,6 +1296,7 @@ export class AgentCore {
                   () => waiting.confirmationDetails.onConfirm(outcome, payload),
                   inheritedView,
                   inheritedAgentId ?? undefined,
+                  inheritedTeammateIdentity,
                 );
               },
               timestamp: Date.now(),