Fix: Capture error from turn_end event in agent state

Previously, errors in turn_end events (e.g., from OpenRouter Auto Router)
were not captured in agent.state.error, making failed requests appear as
successful completions.

Fixes #6

packages/agent/CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelog
+
+## [0.7.6] - Unreleased
+
+### Fixed
+
+- Fixed error message loss when `turn_end` event contains an error. Previously, errors in `turn_end` events (e.g., "Provider returned error" from OpenRouter Auto Router) were not captured in `agent.state.error`, making it appear as if the agent completed successfully. ([#6](https://github.com/badlogic/pi-mono/issues/6))
+
+## [0.7.5] - 2025-11-13
+
+Previous releases did not maintain a changelog.

packages/agent/src/agent.ts

@@ -238,6 +238,13 @@ export class Agent {
 						this._state.pendingToolCalls = s;
 						break;
 					}
+					case "turn_end": {
+						// Capture error from turn_end event
+						if (ev.message.role === "assistant" && ev.message.errorMessage) {
+							this._state.error = ev.message.errorMessage;
+						}
+						break;
+					}
 					case "agent_end": {
 						this._state.streamMessage = null;
 						break;

packages/agent/test/e2e.test.ts

@@ -144,6 +144,8 @@ async function abortExecution(model: Model<any>) {
 	if (lastMessage.role !== "assistant") throw new Error("Expected assistant message");
 	expect(lastMessage.stopReason).toBe("aborted");
 	expect(lastMessage.errorMessage).toBeDefined();
+	expect(agent.state.error).toBeDefined();
+	expect(agent.state.error).toBe(lastMessage.errorMessage);
 }
 
 async function stateUpdates(model: Model<any>) {