fix: harden sub-agent model overrides

src/agents/pi-tool-definition-adapter.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+
+import type { AgentTool } from "@mariozechner/pi-agent-core";
+
+import { toToolDefinitions } from "./pi-tool-definition-adapter.js";
+
+describe("pi tool definition adapter", () => {
+  it("wraps tool errors into a tool result", async () => {
+    const tool = {
+      name: "boom",
+      label: "Boom",
+      description: "throws",
+      parameters: {},
+      execute: async () => {
+        throw new Error("nope");
+      },
+    } satisfies AgentTool<unknown, unknown>;
+
+    const defs = toToolDefinitions([tool]);
+    const result = await defs[0].execute("call1", {}, undefined, undefined);
+
+    expect(result.details).toMatchObject({
+      status: "error",
+      tool: "boom",
+    });
+    expect(JSON.stringify(result.details)).toContain("nope");
+  });
+});