fix(coding-agent): preserve history in terminal hooks

packages/coding-agent/src/session/agent-session.ts

@@ -4403,8 +4403,9 @@ export class AgentSession {
 		// Check auto-retry and auto-compaction after agent completes
 		if (event.type === "agent_end") {
 			const settledMessages = event.messages;
+			const activeMessages = this.agent.state.messages;
 			const emitAgentEndNotification = async (isTerminal = true) => {
-				await this.#emitAgentEndNotification(settledMessages);
+				await this.#emitAgentEndNotification(activeMessages);
 				await this.#emitSessionEvent({ ...event, isTerminal });
 			};
 			const usage = this.getSessionStats().tokens;
@@ -4654,7 +4655,7 @@ export class AgentSession {
 				await emitAgentEndNotification(false);
 				return;
 			}
-			await this.#emitSessionStopEvent(settledMessages, msg);
+			await this.#emitSessionStopEvent(activeMessages, msg);
 			await emitAgentEndNotification();
 		}
 	};

packages/coding-agent/test/agent-session-concurrent.test.ts

@@ -344,6 +344,7 @@ describe("AgentSession concurrent prompt guard", () => {
 			convertToLlm,
 		});
 		const stopEvents: Array<{
+			messages: AgentMessage[];
 			stop_hook_active: boolean;
 			session_id: string;
 			turn_id: number;
@@ -399,6 +400,14 @@ describe("AgentSession concurrent prompt guard", () => {
 		expect(stopEvents.map(event => event.turn_id)).toEqual([0, 0]);
 		expect(stopEvents[0]?.session_id).toBe(session.sessionId);
 		expect(stopEvents[0]?.last_assistant_message?.role).toBe("assistant");
+		expect(
+			stopEvents[1]?.messages.some(
+				message =>
+					message.role === "user" &&
+					Array.isArray(message.content) &&
+					message.content.some(block => block.type === "text" && block.text === "First message"),
+			),
+		).toBe(true);
 	});
 
 	it("uses non-empty session_stop reason when additional context is empty", async () => {