fix(sessions): preserve allow-any subagent model overrides (#21088) (thanks @Slats24)

src/commands/agent.test.ts

@@ -367,6 +367,48 @@ describe("agentCommand", () => {
     });
   });
 
+  it("keeps stored session model override when models allowlist is empty", async () => {
+    await withTempHome(async (home) => {
+      const store = path.join(home, "sessions.json");
+      writeSessionStoreSeed(store, {
+        "agent:main:subagent:allow-any": {
+          sessionId: "session-allow-any",
+          updatedAt: Date.now(),
+          providerOverride: "openai",
+          modelOverride: "gpt-custom-foo",
+        },
+      });
+
+      mockConfig(home, store, {
+        model: { primary: "anthropic/claude-opus-4-5" },
+        models: {},
+      });
+
+      vi.mocked(loadModelCatalog).mockResolvedValueOnce([
+        { id: "claude-opus-4-5", name: "Opus", provider: "anthropic" },
+      ]);
+
+      await agentCommand(
+        {
+          message: "hi",
+          sessionKey: "agent:main:subagent:allow-any",
+        },
+        runtime,
+      );
+
+      const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
+      expect(callArgs?.provider).toBe("openai");
+      expect(callArgs?.model).toBe("gpt-custom-foo");
+
+      const saved = JSON.parse(fs.readFileSync(store, "utf-8")) as Record<
+        string,
+        { providerOverride?: string; modelOverride?: string }
+      >;
+      expect(saved["agent:main:subagent:allow-any"]?.providerOverride).toBe("openai");
+      expect(saved["agent:main:subagent:allow-any"]?.modelOverride).toBe("gpt-custom-foo");
+    });
+  });
+
   it("keeps explicit sessionKey even when sessionId exists elsewhere", async () => {
     await withTempHome(async (home) => {
       const store = path.join(home, "sessions.json");