fix: normalize session keys and outbound mirroring

src/agents/tools/message-tool.test.ts

@@ -8,7 +8,6 @@ import { createMessageTool } from "./message-tool.js";
 
 const mocks = vi.hoisted(() => ({
   runMessageAction: vi.fn(),
-  appendAssistantMessageToSessionTranscript: vi.fn(async () => ({ ok: true, sessionFile: "x" })),
 }));
 
 vi.mock("../../infra/outbound/message-action-runner.js", async () => {
@@ -21,47 +20,9 @@ vi.mock("../../infra/outbound/message-action-runner.js", async () => {
   };
 });
 
-vi.mock("../../config/sessions.js", async () => {
-  const actual = await vi.importActual<typeof import("../../config/sessions.js")>(
-    "../../config/sessions.js",
-  );
-  return {
-    ...actual,
-    appendAssistantMessageToSessionTranscript: mocks.appendAssistantMessageToSessionTranscript,
-  };
-});
-
-describe("message tool mirroring", () => {
-  it("mirrors media filename for plugin-handled sends", async () => {
-    mocks.appendAssistantMessageToSessionTranscript.mockClear();
-    mocks.runMessageAction.mockResolvedValue({
-      kind: "send",
-      action: "send",
-      channel: "telegram",
-      handledBy: "plugin",
-      payload: {},
-      dryRun: false,
-    } satisfies MessageActionRunResult);
-
-    const tool = createMessageTool({
-      agentSessionKey: "agent:main:main",
-      config: {} as never,
-    });
-
-    await tool.execute("1", {
-      action: "send",
-      target: "telegram:123",
-      message: "",
-      media: "https://example.com/files/report.pdf?sig=1",
-    });
-
-    expect(mocks.appendAssistantMessageToSessionTranscript).toHaveBeenCalledWith(
-      expect.objectContaining({ text: "report.pdf" }),
-    );
-  });
-
-  it("does not mirror on dry-run", async () => {
-    mocks.appendAssistantMessageToSessionTranscript.mockClear();
+describe("message tool agent routing", () => {
+  it("derives agentId from the session key", async () => {
+    mocks.runMessageAction.mockClear();
     mocks.runMessageAction.mockResolvedValue({
       kind: "send",
       action: "send",
@@ -72,7 +33,7 @@ describe("message tool mirroring", () => {
     } satisfies MessageActionRunResult);
 
     const tool = createMessageTool({
-      agentSessionKey: "agent:main:main",
+      agentSessionKey: "agent:alpha:main",
       config: {} as never,
     });
 
@@ -82,7 +43,9 @@ describe("message tool mirroring", () => {
       message: "hi",
     });
 
-    expect(mocks.appendAssistantMessageToSessionTranscript).not.toHaveBeenCalled();
+    const call = mocks.runMessageAction.mock.calls[0]?.[0];
+    expect(call?.agentId).toBe("alpha");
+    expect(call?.sessionKey).toBeUndefined();
   });
 });