Q170: agent model suggestions and choices follow the picked provider

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

tests/unit/agent-model-provider.test.ts

@@ -0,0 +1,26 @@
+import { randomUUID } from "node:crypto";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { describe, expect, test } from "vitest";
+import { DatabaseConnection } from "../../src/main/database/connection";
+import { OrganizationService } from "../../src/main/services/organization-service";
+
+describe("an agent's model belongs to its provider", () => {
+  test("a model without a provider is refused on hire and on edit", () => {
+    const connection = new DatabaseConnection(join(tmpdir(), `ac-agent-model-${randomUUID()}.db`));
+    const organization = new OrganizationService(connection.db);
+    let orgId = "";
+    let agentId = "";
+    connection.transaction(() => {
+      orgId = organization.createOrganization({ organizationName: "Acme", employeeName: "Yang", mission: "m", goal: "g" });
+    });
+    const hire = (modelId: string | null) => organization.createAgent({
+      orgId, name: `Ada ${randomUUID().slice(0, 4)}`, role: "Engineer", department: "Engineering", modelProviderId: null, modelId, budgetCents: 1000, managerAgentId: null,
+    });
+    expect(() => connection.transaction(() => hire("gpt-5.4"))).toThrow("Pick the provider before its model.");
+    connection.transaction(() => { agentId = hire(null); });
+    expect(() => connection.transaction(() => organization.updateAgent({
+      orgId, agentId, name: "Ada", role: "Engineer", title: "Engineer", roleLevel: "staff", department: "Engineering", budgetCents: 1000, modelProviderId: null, modelId: "gpt-5.4",
+    }))).toThrow("Pick the provider before its model.");
+  });
+});