fix: fall back to resolved agent dir for btw command

src/auto-reply/reply/commands-btw.test.ts

@@ -128,4 +128,27 @@ describe("handleBtwCommand", () => {
       reply: { text: "nothing important", btw: { question: "what changed?" } },
     });
   });
+
+  it("falls back to the resolved agent dir when the caller omits it", async () => {
+    const params = buildParams("/btw what changed?");
+    params.agentId = "worker-1";
+    params.agentDir = undefined;
+    params.sessionEntry = {
+      sessionId: "session-1",
+      updatedAt: Date.now(),
+    };
+    runBtwSideQuestionMock.mockResolvedValue({ text: "resolved fallback" });
+
+    const result = await handleBtwCommand(params, true);
+
+    expect(runBtwSideQuestionMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        agentDir: expect.stringContaining("/agents/worker-1/agent"),
+      }),
+    );
+    expect(result).toEqual({
+      shouldContinue: false,
+      reply: { text: "resolved fallback", btw: { question: "what changed?" } },
+    });
+  });
 });

src/auto-reply/reply/commands-btw.ts

@@ -1,3 +1,4 @@
+import { resolveAgentDir } from "../../agents/agent-scope.js";
 import { runBtwSideQuestion } from "../../agents/btw.js";
 import { extractBtwQuestion } from "./btw-command.js";
 import { rejectUnauthorizedCommand } from "./command-gates.js";
@@ -32,7 +33,10 @@ export const handleBtwCommand: CommandHandler = async (params, allowTextCommands
     };
   }
 
-  if (!params.agentDir) {
+  const agentDir =
+    params.agentDir ?? (params.agentId ? resolveAgentDir(params.cfg, params.agentId) : undefined);
+
+  if (!agentDir) {
     return {
       shouldContinue: false,
       reply: {
@@ -45,7 +49,7 @@ export const handleBtwCommand: CommandHandler = async (params, allowTextCommands
     await params.typing?.startTypingLoop();
     const reply = await runBtwSideQuestion({
       cfg: params.cfg,
-      agentDir: params.agentDir,
+      agentDir,
       provider: params.provider,
       model: params.model,
       question,