Fix session_status tool validation when called with no arguments (#3226)

- Allow undefined args by defaulting to empty object
- Default to current session when sessionKey is not provided
- Update schema to explicitly allow empty object with additionalProperties: false
- Add test case for undefined args scenario

Fixes #3226

src/agents/clawdbot-tools.session-status.test.ts

@@ -104,6 +104,30 @@ describe("session_status tool", () => {
     expect(details.statusText).not.toContain("OAuth/token status");
   });
 
+  it("accepts undefined args and defaults to current session", async () => {
+    loadSessionStoreMock.mockReset();
+    updateSessionStoreMock.mockReset();
+    loadSessionStoreMock.mockReturnValue({
+      main: {
+        sessionId: "s1",
+        updatedAt: 10,
+      },
+    });
+
+    const tool = createMoltbotTools({ agentSessionKey: "main" }).find(
+      (candidate) => candidate.name === "session_status",
+    );
+    expect(tool).toBeDefined();
+    if (!tool) throw new Error("missing session_status tool");
+
+    // Test with undefined args (the issue scenario)
+    const result = await tool.execute("call1b", undefined as unknown as Record<string, unknown>);
+    const details = result.details as { ok?: boolean; statusText?: string };
+    expect(details.ok).toBe(true);
+    expect(details.statusText).toContain("Moltbot");
+    expect(details.statusText).toContain("🧠 Model:");
+  });
+
   it("errors for unknown session keys", async () => {
     loadSessionStoreMock.mockReset();
     updateSessionStoreMock.mockReset();

src/agents/tools/session-status-tool.ts

@@ -48,10 +48,13 @@ import {
 } from "./sessions-helpers.js";
 import { loadCombinedSessionStoreForGateway } from "../../gateway/session-utils.js";
 
-const SessionStatusToolSchema = Type.Object({
+const SessionStatusToolSchema = Type.Object(
+  {
     sessionKey: Type.Optional(Type.String()),
     model: Type.Optional(Type.String()),
-});
+  },
+  { additionalProperties: false },
+);
 
 function formatApiKeySnippet(apiKey: string): string {
   const compact = apiKey.replace(/\s+/g, "");
@@ -241,15 +244,16 @@ export function createSessionStatusTool(opts?: {
       "Show a /status-equivalent session status card (usage + time + cost when available). Use for model-use questions (📊 session_status). Optional: set per-session model override (model=default resets overrides).",
     parameters: SessionStatusToolSchema,
     execute: async (_toolCallId, args) => {
-      const params = args as Record<string, unknown>;
+      const params = (args ?? {}) as Record<string, unknown>;
       const cfg = opts?.config ?? loadConfig();
       const { mainKey, alias } = resolveMainSessionAlias(cfg);
       const a2aPolicy = createAgentToAgentPolicy(cfg);
 
       const requestedKeyParam = readStringParam(params, "sessionKey");
-      let requestedKeyRaw = requestedKeyParam ?? opts?.agentSessionKey;
+      let requestedKeyRaw = requestedKeyParam ?? opts?.agentSessionKey ?? "";
-      if (!requestedKeyRaw?.trim()) {
+      if (!requestedKeyRaw.trim()) {
-        throw new Error("sessionKey required");
+        // Default to current session if no key provided
+        requestedKeyRaw = opts?.agentSessionKey ?? mainKey;
       }
 
       const requesterAgentId = resolveAgentIdFromSessionKey(