feat(routing): honor models.for via metadata modelFor

src/daemon/routing.test.ts

@@ -51,28 +51,96 @@ describe('daemon agent routing integration', () => {
     expect(router.resolve('telegram', '123')).toBeUndefined();
   });
 
-  it('model tier precedence: metadata > agent config > global default', () => {
+  it('model tier precedence: metadata > metadata modelFor > agent config > global default', () => {
     // This test documents the tier resolution precedence used by createMessageRouter.
-    // The actual resolution logic: tierFromMetadata ?? agentConfig?.modelTier ?? primary_tier ?? 'default'
+    // The actual resolution logic:
+    // tierFromMetadata ?? tierFromMetadataModelFor ?? agentConfig?.modelTier ?? primary_tier ?? 'default'
     function resolveTier(
       metadataTier: ModelTier | undefined,
+      metadataForTier: ModelTier | undefined,
       agentTier: ModelTier | undefined,
       globalTier: ModelTier | undefined,
     ): ModelTier {
-      return metadataTier ?? agentTier ?? globalTier ?? 'default';
+      return metadataTier ?? metadataForTier ?? agentTier ?? globalTier ?? 'default';
     }
 
     // With all three set, metadata wins
-    expect(resolveTier('fast', 'complex', 'default')).toBe('fast');
+    expect(resolveTier('fast', 'default', 'complex', 'default')).toBe('fast');
+
+    // Without explicit metadata tier, modelFor-resolved tier wins
+    expect(resolveTier(undefined, 'complex', 'default', 'fast')).toBe('complex');
 
     // Without metadata, agent config wins
-    expect(resolveTier(undefined, 'complex', 'default')).toBe('complex');
+    expect(resolveTier(undefined, undefined, 'complex', 'default')).toBe('complex');
 
     // Without metadata or agent config, global wins
-    expect(resolveTier(undefined, undefined, 'default')).toBe('default');
+    expect(resolveTier(undefined, undefined, undefined, 'default')).toBe('default');
 
     // Without anything, falls back to 'default'
-    expect(resolveTier(undefined, undefined, undefined)).toBe('default');
+    expect(resolveTier(undefined, undefined, undefined, undefined)).toBe('default');
+  });
+
+  it('uses metadata.modelFor tags to select tier', async () => {
+    const processSpy = vi.spyOn(AgentOrchestrator.prototype, 'process').mockResolvedValue('ok');
+    const session = {
+      id: 'telegram:model-for',
+      addMessage: vi.fn(),
+      getHistory: vi.fn(() => []),
+      clear: vi.fn(),
+      replaceHistory: vi.fn(),
+      getConfig: vi.fn(() => undefined),
+      setConfig: vi.fn(),
+      deleteConfig: vi.fn(),
+    };
+
+    const router = createMessageRouter({
+      sessionManager: {
+        getSession: vi.fn(() => session),
+      } as unknown as MessageRouterDeps['sessionManager'],
+      modelRouter: {
+        getAvailableTiers: () => ['fast', 'default', 'complex', 'local'],
+        getAllLabels: () => ({ fast: 'fast', default: 'default', complex: 'complex', local: 'local' }),
+        getLabel: (tier: string) => tier,
+      } as unknown as MessageRouterDeps['modelRouter'],
+      systemPrompt: 'test prompt',
+      toolRegistry: {
+        clone() { return this; },
+        register: vi.fn(),
+      } as unknown as MessageRouterDeps['toolRegistry'],
+      toolExecutor: {} as unknown as MessageRouterDeps['toolExecutor'],
+      config: {
+        agents: {
+          primary_tier: 'default',
+          delegation: {
+            compaction: 'fast',
+            memory_extraction: 'fast',
+            classification: 'fast',
+            tool_summarisation: 'fast',
+            complex_reasoning: 'complex',
+          },
+          max_delegation_depth: 3,
+          max_iterations: 10,
+        },
+        compaction: { enabled: false },
+        models: {
+          default: { provider: 'anthropic', model: 'claude', for: ['chat'] },
+          fast: { provider: 'anthropic', model: 'haiku', for: ['search'] },
+        },
+      } as unknown as MessageRouterDeps['config'],
+    });
+
+    await router.handler({
+      id: 'm-model-for',
+      channel: 'telegram',
+      senderId: 'model-for',
+      text: 'find this quickly',
+      timestamp: Date.now(),
+      metadata: { modelFor: 'search' },
+    } as MessageRouterInput, vi.fn(async () => {}));
+
+    const keys = Array.from(router.agents.keys());
+    expect(keys.some((key) => key.endsWith(':fast'))).toBe(true);
+    expect(processSpy).toHaveBeenCalled();
   });
 });