diff --git a/src/gateway/talk-realtime-relay-tool-call-ledger.test.ts b/src/gateway/talk-realtime-relay-tool-call-ledger.test.ts
index 0415329ad542..be8c4a725bd5 100644
--- a/src/gateway/talk-realtime-relay-tool-call-ledger.test.ts
+++ b/src/gateway/talk-realtime-relay-tool-call-ledger.test.ts
@@ -2,16 +2,21 @@ import { describe, expect, it, vi } from "vitest";
 import { RelayToolCallLedger } from "./talk-realtime-relay-tool-call-ledger.js";
 
 describe("RelayToolCallLedger", () => {
-  it("shares one retained identity across cancellation and terminal outcomes", () => {
+  it("preserves the first cancellation turn until agent completion wins", () => {
     const ledger = new RelayToolCallLedger({ onOverflow: vi.fn(), maxEntries: 2 });
 
     expect(ledger.tryAdmit(["call-1"])).toBe(true);
     expect(ledger.markCancelled(["call-1"], "turn-1")).toBe(true);
+    expect(ledger.markCancelled(["call-1"], "turn-2")).toBe(true);
+    expect(ledger.cancelledTurnId("call-1")).toBe("turn-1");
+
     expect(ledger.markAgentCompleted(["call-1"])).toBe(true);
+    expect(ledger.hasCancelled("call-1")).toBe(false);
+    expect(ledger.markCancelled(["call-1"], "turn-3")).toBe(true);
     expect(ledger.markProviderCompleted(["call-1"])).toBe(true);
 
     expect(ledger.size).toBe(1);
-    expect(ledger.cancelledTurnId("call-1")).toBe("turn-1");
+    expect(ledger.cancelledTurnId("call-1")).toBeUndefined();
     expect(ledger.isAgentCompleted("call-1")).toBe(true);
     expect(ledger.isProviderCompleted("call-1")).toBe(true);
   });
@@ -35,9 +40,9 @@ describe("RelayToolCallLedger", () => {
     const ledger = new RelayToolCallLedger({ onOverflow: vi.fn(), maxEntries: 1 });
 
     ledger.markCancelled(["call-1"], "turn-1");
+    ledger.deleteCancelled("call-1");
     ledger.markAgentCompleted(["call-1"]);
     ledger.markProviderCompleted(["call-1"]);
-    ledger.deleteCancelled("call-1");
     ledger.deleteAgentCompleted("call-1");
     ledger.clearProviderCompleted();
 
diff --git a/src/gateway/talk-realtime-relay-tool-call-ledger.ts b/src/gateway/talk-realtime-relay-tool-call-ledger.ts
index 72a2f30a133d..0830e75e9df3 100644
--- a/src/gateway/talk-realtime-relay-tool-call-ledger.ts
+++ b/src/gateway/talk-realtime-relay-tool-call-ledger.ts
@@ -73,7 +73,10 @@ export class RelayToolCallLedger {
 
   markAgentCompleted(callIds: Iterable<string>): boolean {
     return this.mark(callIds, (entry) => {
+      // Completion is terminal for the owner-facing call. Do not let stale
+      // cancellation metadata route a later result through cancellation again.
       entry.agentCompleted = true;
+      delete entry.cancelledTurnId;
     });
   }
 
@@ -111,7 +114,11 @@ export class RelayToolCallLedger {
 
   markCancelled(callIds: Iterable<string>, turnId: string): boolean {
     return this.mark(callIds, (entry) => {
-      entry.cancelledTurnId = turnId;
+      // The first cancel owns the original turn until completion. Retries and
+      // late cancellation events must not replace or revive that lifecycle fact.
+      if (!entry.agentCompleted && entry.cancelledTurnId === undefined) {
+        entry.cancelledTurnId = turnId;
+      }
     });
   }
 
diff --git a/src/gateway/talk-realtime-relay.test.ts b/src/gateway/talk-realtime-relay.test.ts
index d0182f231da0..c97e0a24719f 100644
--- a/src/gateway/talk-realtime-relay.test.ts
+++ b/src/gateway/talk-realtime-relay.test.ts
@@ -3988,6 +3988,7 @@ describe("talk realtime gateway relay", () => {
   it("fails closed when retained relay tool-call identities reach their hard cap", () => {
     let bridgeRequest: RealtimeVoiceBridgeCreateRequest | undefined;
     const close = vi.fn();
+    const submitToolResult = vi.fn();
     const provider: RealtimeVoiceProviderPlugin = {
       id: "relay-test",
       label: "Relay Test",
@@ -3999,7 +4000,7 @@ describe("talk realtime gateway relay", () => {
           sendAudio: vi.fn(),
           setMediaTimestamp: vi.fn(),
           handleBargeIn: vi.fn(),
-          submitToolResult: vi.fn(),
+          submitToolResult,
           acknowledgeMark: vi.fn(),
           close,
           isConnected: vi.fn(() => true),
@@ -4017,6 +4018,13 @@ describe("talk realtime gateway relay", () => {
     });
     const retainedSession = relaySessions.get(session.relaySessionId);
     expect(retainedSession).toBeDefined();
+    const toolCallEventCount = () =>
+      broadcastToConnIds.mock.calls.filter(
+        ([, payload]) =>
+          typeof payload === "object" &&
+          payload !== null &&
+          (payload as { type?: string }).type === "toolCall",
+      ).length;
 
     for (let index = 0; index < MAX_RELAY_TOOL_CALL_IDENTITIES; index += 1) {
       bridgeRequest?.onToolCall?.({
@@ -4029,6 +4037,7 @@ describe("talk realtime gateway relay", () => {
 
     expect(retainedSession?.toolCalls.size).toBe(MAX_RELAY_TOOL_CALL_IDENTITIES);
     expect(relaySessions.has(session.relaySessionId)).toBe(true);
+    expect(toolCallEventCount()).toBe(MAX_RELAY_TOOL_CALL_IDENTITIES);
 
     bridgeRequest?.onToolCall?.({
       itemId: "item-overflow",
@@ -4039,6 +4048,9 @@ describe("talk realtime gateway relay", () => {
 
     expect(close).toHaveBeenCalledOnce();
     expect(relaySessions.has(session.relaySessionId)).toBe(false);
+    expect(retainedSession?.toolCalls.has("call-overflow")).toBe(false);
+    expect(toolCallEventCount()).toBe(MAX_RELAY_TOOL_CALL_IDENTITIES);
+    expect(submitToolResult).not.toHaveBeenCalled();
     expect(
       broadcastToConnIds.mock.calls.filter(
         ([, payload]) =>
@@ -4064,6 +4076,9 @@ describe("talk realtime gateway relay", () => {
     });
     expect(close).toHaveBeenCalledOnce();
     expect(retainedSession?.toolCalls.size).toBe(MAX_RELAY_TOOL_CALL_IDENTITIES);
+    expect(retainedSession?.toolCalls.has("call-late")).toBe(false);
+    expect(toolCallEventCount()).toBe(MAX_RELAY_TOOL_CALL_IDENTITIES);
+    expect(submitToolResult).not.toHaveBeenCalled();
   });
 
   it("caps active relay sessions per browser connection", () => {