{"record":{"id":"180299c7ba63b16f","repo":"microsoft/playwright","slug":"failed-to-connect-to-mcp-relay-error-message","errorCode":null,"errorMessage":"Failed to connect to MCP relay: ${error.message}","messagePattern":"Failed to connect to MCP relay: (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/extension/src/pendingConnection.ts","lineNumber":53,"sourceCode":"      return undefined;\n    this._map.delete(selectorTabId);\n    return openRelayConnection(mcpRelayUrl);\n  }\n}\n\nasync function openRelayConnection(mcpRelayUrl: string): Promise<RelayConnection> {\n  try {\n    const socket = new WebSocket(mcpRelayUrl);\n    await new Promise<void>((resolve, reject) => {\n      socket.onopen = () => resolve();\n      socket.onerror = () => reject(new Error('WebSocket error'));\n      setTimeout(() => reject(new Error('Connection timeout')), 5000);\n    });\n    return new RelayConnection(socket);\n  } catch (error: any) {\n    const message = `Failed to connect to MCP relay: ${error.message}`;\n    debugLog(message);\n    throw new Error(message);\n  }\n}\n","sourceCodeStart":35,"sourceCodeEnd":56,"githubUrl":"https://github.com/microsoft/playwright/blob/c8fc3bf8d31542d59b4d4d9eaab1df93ff541dc6/packages/extension/src/pendingConnection.ts#L35-L56","documentation":"Error \"Failed to connect to MCP relay: ${error.message}\" thrown in microsoft/playwright.","triggerScenarios":"Thrown at packages/extension/src/pendingConnection.ts:53 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"c8fc3bf8d31542d59b4d4d9eaab1df93ff541dc6","analyzedAt":"2026-08-12T07:26:36.950Z","schemaVersion":2},"datasetVersion":"2026-08-12T13:17:24.610Z"}