fix(extensions): scope mcp installed cache by project

src/main/services/extensions/state/McpInstallationStateService.ts

@@ -27,15 +27,16 @@ interface TimedCache<T> {
 }
 
 export class McpInstallationStateService {
-  private cache: TimedCache<InstalledMcpEntry[]> | null = null;
+  private cache = new Map<string, TimedCache<InstalledMcpEntry[]>>();
 
   /**
    * Get all installed MCP servers across user and project scopes.
    */
   async getInstalled(projectPath?: string): Promise<InstalledMcpEntry[]> {
-    // Cache is project-path-dependent, so invalidate on path change
+    const cacheKey = projectPath ?? '__user__';
-    if (this.cache && Date.now() - this.cache.fetchedAt < CACHE_TTL_MS) {
+    const cached = this.cache.get(cacheKey);
-      return this.cache.data;
+    if (cached && Date.now() - cached.fetchedAt < CACHE_TTL_MS) {
+      return cached.data;
     }
 
     const entries: InstalledMcpEntry[] = [];
@@ -50,7 +51,7 @@ export class McpInstallationStateService {
       entries.push(...projectEntries);
     }
 
-    this.cache = { data: entries, fetchedAt: Date.now() };
+    this.cache.set(cacheKey, { data: entries, fetchedAt: Date.now() });
     return entries;
   }
 
@@ -58,7 +59,7 @@ export class McpInstallationStateService {
    * Invalidate cache. Call after install/uninstall operations.
    */
   invalidateCache(): void {
-    this.cache = null;
+    this.cache.clear();
   }
 
   // ── Private ────────────────────────────────────────────────────────────

test/main/services/extensions/McpInstallationStateService.test.ts

@@ -0,0 +1,98 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as fs from 'node:fs/promises';
+
+import { McpInstallationStateService } from '@main/services/extensions/state/McpInstallationStateService';
+
+vi.mock('@main/utils/pathDecoder', () => ({
+  getHomeDir: () => '/tmp/mock-home',
+}));
+
+vi.mock('node:fs/promises');
+
+describe('McpInstallationStateService', () => {
+  let service: McpInstallationStateService;
+  const mockedFs = vi.mocked(fs);
+
+  beforeEach(() => {
+    service = new McpInstallationStateService();
+    vi.clearAllMocks();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  describe('getInstalled', () => {
+    it('caches results within TTL for the same project path', async () => {
+      mockedFs.readFile.mockImplementation(async (filePath) => {
+        const normalizedPath = String(filePath);
+        if (normalizedPath === '/tmp/mock-home/.claude.json') {
+          return JSON.stringify({
+            mcpServers: {
+              context7: { command: 'npx -y @upstash/context7-mcp' },
+            },
+          });
+        }
+
+        if (normalizedPath === '/tmp/project-a/.mcp.json') {
+          return JSON.stringify({
+            mcpServers: {
+              'repo-a-server': { url: 'https://repo-a.example.com/mcp' },
+            },
+          });
+        }
+
+        throw Object.assign(new Error('ENOENT'), { code: 'ENOENT' });
+      });
+
+      await service.getInstalled('/tmp/project-a');
+      await service.getInstalled('/tmp/project-a');
+
+      expect(mockedFs.readFile).toHaveBeenCalledTimes(2);
+    });
+
+    it('caches results independently per project path', async () => {
+      mockedFs.readFile.mockImplementation(async (filePath) => {
+        const normalizedPath = String(filePath);
+        if (normalizedPath === '/tmp/mock-home/.claude.json') {
+          return JSON.stringify({
+            mcpServers: {
+              context7: { command: 'npx -y @upstash/context7-mcp' },
+            },
+          });
+        }
+
+        if (normalizedPath === '/tmp/project-a/.mcp.json') {
+          return JSON.stringify({
+            mcpServers: {
+              'repo-a-server': { url: 'https://repo-a.example.com/mcp' },
+            },
+          });
+        }
+
+        if (normalizedPath === '/tmp/project-b/.mcp.json') {
+          return JSON.stringify({
+            mcpServers: {
+              'repo-b-server': { command: 'uvx repo-b-mcp' },
+            },
+          });
+        }
+
+        throw Object.assign(new Error('ENOENT'), { code: 'ENOENT' });
+      });
+
+      const projectAEntries = await service.getInstalled('/tmp/project-a');
+      const projectBEntries = await service.getInstalled('/tmp/project-b');
+
+      expect(projectAEntries).toEqual([
+        { name: 'context7', scope: 'user', transport: 'stdio' },
+        { name: 'repo-a-server', scope: 'project', transport: 'http' },
+      ]);
+      expect(projectBEntries).toEqual([
+        { name: 'context7', scope: 'user', transport: 'stdio' },
+        { name: 'repo-b-server', scope: 'project', transport: 'stdio' },
+      ]);
+      expect(mockedFs.readFile).toHaveBeenCalledTimes(4);
+    });
+  });
+});