feat: add configurable MCP server loading timeout #580
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- Add mcpLoadingTimeoutSeconds setting to control connection test timeout - Add timeout configuration UI in MCP servers settings header - Update mcp-test-service to use configurable timeout - Add settings migration for new timeout field - Add unit tests for timeout functionality Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Note Other AI code review bot(s) detectedCodeRabbit has detected other AI code review bot(s) in this pull request and will avoid duplicating their findings in the review comments. This may lead to a less comprehensive review. 📝 WalkthroughWalkthroughAdds a configurable MCP loading timeout across backend and frontend: MCPTestService gains constructor and per-call timeout options; UI introduces a header input and store wiring for Changes
Sequence Diagram(s)sequenceDiagram
participant User as User
participant UI as MCPServerHeader
participant Store as AppStore
participant Migration as SettingsMigration
participant Server as Backend
participant Service as MCPTestService
User->>UI: Set loading timeout (seconds)
UI->>Store: onTimeoutChange(timeout ms)
Store->>Store: setMcpLoadingTimeout(timeout)
Store->>Migration: persist settings (includes mcpLoadingTimeout)
Migration->>Server: POST /settings (mcpLoadingTimeout)
Note over User,Service: Later, when testing an MCP server
User->>Server: request test for serverId
Server->>Service: testServerById(serverId)
Service->>Store: read global mcpLoadingTimeout (resolve timeoutMs)
Service->>Service: call testServer(config, { timeoutMs })
Service->>Service: client.connect with timeoutMs (Promise.race)
Service->>Service: client.listTools with timeoutMs (Promise.race)
Service->>Server: return MCPTestResult
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Possibly related PRs
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Summary of ChangesHello @Nikoqqq, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request enhances the application's flexibility by allowing users to customize the timeout period for MCP server interactions. This addresses potential issues with slow server responses or network conditions by providing a user-friendly way to adjust the waiting time, ensuring a smoother experience when connecting to and testing MCP servers. The changes span both the backend logic and the user interface for a complete solution. Highlights
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Code Review
This pull request introduces a configurable timeout for MCP server connections, which is a great enhancement for flexibility. The changes are well-implemented across the server, UI, and settings persistence layers. I appreciate that you've also enabled and added unit tests for this new functionality.
My review includes two main suggestions for improvement:
- Consolidating the hardcoded default timeout value into a single shared constant to improve maintainability.
- Strengthening the new unit tests to actually verify the timeout behavior using fake timers, as they are currently placeholders.
Overall, this is a solid contribution. Addressing these points will make the implementation more robust and easier to maintain.
| // Would verify timeout behavior if SDK wasn't mocked | ||
| expect(true).toBe(true); |
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This test, and others in this describe block for configurable timeouts, don't actually verify the timeout functionality as they just assert true to be true. This means the new timeout logic is not being properly tested.
You can use vi.useFakeTimers() to test the timeout logic effectively. Here's an example of how you could verify that the correct timeout is being used:
it('should timeout after the configured duration', async () => {
vi.useFakeTimers();
const service = new MCPTestService(mockSettingsService, { timeoutMs: 5000 });
const config: MCPServerConfig = {
id: 'test-server',
name: 'Test Server',
type: 'stdio',
command: 'node',
enabled: true,
};
// Make the connect promise never resolve to ensure the timeout is triggered
mockClient.connect.mockReturnValue(new Promise(() => {}));
const testPromise = service.testServer(config);
// Advance timers to just before the timeout to ensure it doesn't fire early
await vi.advanceTimersByTimeAsync(4999);
// Now, advance past the timeout
await vi.advanceTimersByTimeAsync(1);
// Assert that the promise rejects with a timeout error
await expect(testPromise).rejects.toThrow('Connection timeout');
});Applying this pattern to the other placeholder tests would ensure the new timeout feature is robust.
| ...(settings.keyboardShortcuts as unknown as Partial<typeof current.keyboardShortcuts>), | ||
| }, | ||
| mcpServers: settings.mcpServers ?? [], | ||
| mcpLoadingTimeout: settings.mcpLoadingTimeout ?? 10000, |
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The default timeout value 10000 is hardcoded here. This magic number is also present in apps/ui/src/store/app-store.ts and apps/server/src/services/mcp-test-service.ts (as DEFAULT_TIMEOUT).
To improve maintainability and have a single source of truth, I recommend defining this default value as an exported constant in libs/types/src/settings.ts and then importing it in all the places where it's used.
For example, in libs/types/src/settings.ts:
export const DEFAULT_MCP_LOADING_TIMEOUT = 10000;Then you could use DEFAULT_MCP_LOADING_TIMEOUT here and in the other files.
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In `@apps/server/src/services/mcp-test-service.ts`:
- Around line 195-197: The fallback in testServerById currently uses
DEFAULT_TIMEOUT instead of the service-level configured timeout; change the
timeout resolution to prefer globalSettings.mcpLoadingTimeout, then the
service's configured default (e.g., this.defaultTimeout or this.timeoutMs as set
in the service constructor), and only then DEFAULT_TIMEOUT, so call
this.testServer(serverConfig, { timeoutMs }) with timeoutMs =
globalSettings.mcpLoadingTimeout ?? this.defaultTimeout ?? DEFAULT_TIMEOUT.
🧹 Nitpick comments (3)
apps/server/tests/unit/services/mcp-test-service.test.ts (1)
62-169: Timeout tests are effectively no-ops right now.
They don’t assert the configured timeout behavior, so regressions will pass silently. Consider using fake timers + a never-resolving connect/listTools to validate error messages and timing.✅ Example test that actually verifies timeout
@@ describe('constructor options', () => { - it('should use custom timeout from constructor options', async () => { + it('should use custom timeout from constructor options', async () => { const customTimeout = 30000; // 30 seconds const service = new MCPTestService(mockSettingsService, { timeoutMs: customTimeout }); const config: MCPServerConfig = { id: 'test-server', name: 'Test Server', type: 'stdio', command: 'node', enabled: true, }; - await service.testServer(config); - // Would verify timeout is 30000ms if SDK wasn't mocked - expect(true).toBe(true); + vi.useFakeTimers(); + mockClient.connect.mockImplementation(() => new Promise(() => {})); + + const resultPromise = service.testServer(config); + await vi.advanceTimersByTimeAsync(customTimeout); + const result = await resultPromise; + + expect(result.success).toBe(false); + expect(result.error).toBe('Connection timeout'); }); });apps/ui/src/components/views/settings-view/mcp-servers/components/mcp-server-header.tsx (1)
31-39: Clamp input and consider debouncing server sync.
onTimeoutChangefires every keystroke and ultimately syncs to the server (seeapps/ui/src/store/app-store.tssetter), which can spam updates. Also, max=300 isn’t enforced in JS.🔧 Clamp before persisting
- const handleTimeoutChange = (e: React.ChangeEvent<HTMLInputElement>) => { - const seconds = parseInt(e.target.value, 10); - if (!isNaN(seconds) && seconds >= 1) { - onTimeoutChange(seconds * 1000); // Convert seconds to milliseconds - } - }; + const handleTimeoutChange = (e: React.ChangeEvent<HTMLInputElement>) => { + const seconds = parseInt(e.target.value, 10); + if (!Number.isNaN(seconds)) { + const clamped = Math.min(300, Math.max(1, seconds)); + onTimeoutChange(clamped * 1000); // Convert seconds to milliseconds + } + };If you want to reduce server writes, consider committing on blur or with a short debounce.
Also applies to: 115-123
apps/ui/src/store/app-store.ts (1)
2457-2462: Guard timeout values and handle sync failures.Line 2457 currently trusts any input and doesn’t revert on sync failure. Consider validating the value (finite, >0) and reverting if sync fails to keep UI/server consistent.
♻️ Proposed refactor
setMcpLoadingTimeout: async (timeout) => { - set({ mcpLoadingTimeout: timeout }); - // Sync to server settings file - const { syncSettingsToServer } = await import('@/hooks/use-settings-migration'); - await syncSettingsToServer(); + const previous = get().mcpLoadingTimeout; + const nextTimeout = + Number.isFinite(timeout) && timeout > 0 ? timeout : previous; + set({ mcpLoadingTimeout: nextTimeout }); + // Sync to server settings file + const { syncSettingsToServer } = await import('@/hooks/use-settings-migration'); + const ok = await syncSettingsToServer(); + if (!ok) { + logger.error('Failed to sync mcpLoadingTimeout setting to server - reverting'); + set({ mcpLoadingTimeout: previous }); + } },
| // Use timeout from settings if configured, otherwise use default | ||
| const timeoutMs = globalSettings.mcpLoadingTimeout ?? DEFAULT_TIMEOUT; | ||
| return this.testServer(serverConfig, { timeoutMs }); |
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Fallback should honor the service-level default timeout.
testServerById ignores a custom constructor timeout and always falls back to DEFAULT_TIMEOUT. This makes behavior inconsistent with testServer.
🔧 Proposed fix
- const timeoutMs = globalSettings.mcpLoadingTimeout ?? DEFAULT_TIMEOUT;
+ const timeoutMs = globalSettings.mcpLoadingTimeout ?? this.defaultTimeoutMs;📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // Use timeout from settings if configured, otherwise use default | |
| const timeoutMs = globalSettings.mcpLoadingTimeout ?? DEFAULT_TIMEOUT; | |
| return this.testServer(serverConfig, { timeoutMs }); | |
| // Use timeout from settings if configured, otherwise use default | |
| const timeoutMs = globalSettings.mcpLoadingTimeout ?? this.defaultTimeoutMs; | |
| return this.testServer(serverConfig, { timeoutMs }); |
🤖 Prompt for AI Agents
In `@apps/server/src/services/mcp-test-service.ts` around lines 195 - 197, The
fallback in testServerById currently uses DEFAULT_TIMEOUT instead of the
service-level configured timeout; change the timeout resolution to prefer
globalSettings.mcpLoadingTimeout, then the service's configured default (e.g.,
this.defaultTimeout or this.timeoutMs as set in the service constructor), and
only then DEFAULT_TIMEOUT, so call this.testServer(serverConfig, { timeoutMs })
with timeoutMs = globalSettings.mcpLoadingTimeout ?? this.defaultTimeout ??
DEFAULT_TIMEOUT.
- Use service default timeout as fallback in testServerById instead of constant - Clamp timeout input between 1-300 seconds in UI component - Add validation and sync failure handling in store setter Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
There was a problem hiding this comment.
Actionable comments posted: 1
🤖 Fix all issues with AI agents
In `@apps/ui/src/store/app-store.ts`:
- Around line 2457-2468: In setMcpLoadingTimeout, multiple overlapping async
syncSettingsToServer() calls can out-of-order revert a newer value; add a local
request id or capture the current mcpLoadingTimeout after setting (use
get().mcpLoadingTimeout) and before awaiting sync, then after the await verify
that the stored value still equals that request id/value before performing the
revert; if a revert is prevented because the value changed, log the sync failure
with context (include the attempted timeout and that it was stale) so only the
matching request can undo the change and stale failures don’t clobber newer
settings.
🧹 Nitpick comments (1)
apps/server/src/services/mcp-test-service.ts (1)
65-71: Guard against non-positive/NaN timeout overrides.If a caller passes
0,NaN, or a negative number, the test will immediately time out. Consider validating the override before using it.♻️ Proposed fix
- const timeoutMs = options?.timeoutMs ?? this.defaultTimeoutMs; + const overrideTimeoutMs = options?.timeoutMs; + const timeoutMs = + Number.isFinite(overrideTimeoutMs) && overrideTimeoutMs > 0 + ? overrideTimeoutMs + : this.defaultTimeoutMs;
- Prevent race condition in setMcpLoadingTimeout by checking value before revert - Validate timeout override in testServer to guard against NaN/negative values Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Closing to recreate with proper branch naming (feature/mcp-loading-timeout) |
1 participant
Summary
Some MCP servers take longer than the default 10 seconds to initialize and respond, especially those that need to download models, connect to external services, or perform complex startup routines. This PR adds a configurable timeout setting so users can adjust the wait time based on their specific MCP server requirements.
Changes
mcpLoadingTimeoutSecondssetting to control MCP server connection test timeoutTest plan
🤖 Generated with Claude Code
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