Q167: the model in effect and what a default change reaches are shown

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/agent-model.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from "vitest";
+import { agentModel, defaultModelReach } from "../../src/shared/agent-model";
+import { effectiveModel } from "../../src/main/services/task-run-preparation";
+
+describe("agent model", () => {
+  it("names the model in effect and where it comes from", () => {
+    expect(agentModel("gpt-6", "gpt-5")).toEqual({ model: "gpt-6", source: "agent" });
+    expect(agentModel("  ", "gpt-5")).toEqual({ model: "gpt-5", source: "provider_default" });
+    expect(agentModel(null, null)).toEqual({ model: null, source: "none" });
+    // Runs start with exactly the model the UI shows.
+    expect(effectiveModel(" gpt-6 ", "gpt-5")).toBe("gpt-6");
+    expect(effectiveModel(null, "gpt-5")).toBe("gpt-5");
+  });
+
+  it("counts the agents a default-model change reaches", () => {
+    const agents = [
+      { modelProviderId: "p1", modelId: null },
+      { modelProviderId: "p1", modelId: "" },
+      { modelProviderId: "p1", modelId: "own" },
+      { modelProviderId: "p2", modelId: null },
+    ];
+    expect(defaultModelReach(agents, "p1")).toEqual({ following: 2, ownModel: 1 });
+  });
+});

tests/unit/message-readers.test.ts

@@ -6,7 +6,7 @@ function run(agentId: string | null, contextJson: string | null): TaskRunRecord
   return {
     id: `run_${Math.random()}`, orgId: "org", taskId: "tsk", agentId, providerId: null, providerRequestId: null,
     executionContextId: null, serviceIdentityId: null, workspaceMountJson: "[]", secretScopeJson: "{}",
-    trigger: "chat_mention", state: "completed", createdAt: "", startedAt: null, completedAt: null, errorMessage: null, contextJson, capabilityWarnings: null,
+    trigger: "chat_mention", state: "completed", createdAt: "", startedAt: null, completedAt: null, errorMessage: null, contextJson, capabilityWarnings: null, runModel: null,
   };
 }