{"record":{"id":"23618778e7629a5d","repo":"microsoft/autogen","slug":"failed-to-fetch-messages","errorCode":null,"errorMessage":"Failed to fetch messages","messagePattern":"Failed to fetch messages","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"python/packages/autogen-studio/frontend/src/components/views/playground/api.ts","lineNumber":117,"sourceCode":"      }\n    );\n    const data = await response.json();\n    if (!data.status)\n      throw new Error(data.message || \"Failed to delete session\");\n  }\n\n  // Adding messages endpoint\n  async listSessionMessages(sessionId: number, userId: string): Promise<any[]> {\n    // Replace 'any' with proper message type\n    const response = await fetch(\n      `${this.getBaseUrl()}/sessions/${sessionId}/messages?user_id=${userId}`,\n      {\n        headers: this.getHeaders(),\n      }\n    );\n    const data = await response.json();\n    if (!data.status)\n      throw new Error(data.message || \"Failed to fetch messages\");\n    return data.data;\n  }\n\n  // New method to create a run\n  async createRun(sessionId: number, userId: string): Promise<number> {\n    const payload = { session_id: sessionId, user_id: userId };\n    const response = await fetch(`${this.getBaseUrl()}/runs/`, {\n      method: \"POST\",\n      headers: this.getHeaders(),\n      body: JSON.stringify(payload),\n    });\n\n    const data = await response.json();\n    if (!data.status) throw new Error(data.message || \"Failed to create run\");\n    return data.data.run_id;\n  }\n}\n","sourceCodeStart":99,"sourceCodeEnd":135,"githubUrl":"https://github.com/microsoft/autogen/blob/027ecf0a379bcc1d09956d46d12d44a3ad9cee14/python/packages/autogen-studio/frontend/src/components/views/playground/api.ts#L99-L135","documentation":"Thrown by SessionAPI.listSessionMessages when GET /sessions/{id}/messages?user_id=... returns falsy status. Note this endpoint is marked as returning any[] — it is an auxiliary endpoint; failure typically shares causes with the other session endpoints (invalid id/ownership) or the route not being present in older backends.","triggerScenarios":"GET /sessions/{id}/messages for a nonexistent/unowned session, or a backend version without this route answering with the error envelope.","commonSituations":"Backend/frontend version skew (frontend ships the method before the backend route exists), deleted session, user mismatch.","solutions":["Confirm the endpoint exists on the backend (openapi docs / curl)","Verify session existence and ownership via getSession first","Read data.message for the concrete backend reason","Prefer the richer getSessionRuns endpoint if messages-only is optional in your UI"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"null","typeGuard":null,"tryCatchPattern":"try {\n  return await sessionAPI.listSessionMessages(sessionId, userId);\n} catch {\n  return []; // messages endpoint is auxiliary — degrade to empty\n}","preventionTips":["Feature-detect the endpoint (openapi) before relying on it","Prefer getSessionRuns which returns richer transcript data","Don't build critical UI paths on auxiliary endpoints"],"tags":["sessions","messages","http","error-envelope"],"backgroundTag":null,"analyzedSha":"027ecf0a379bcc1d09956d46d12d44a3ad9cee14","analyzedAt":"2026-08-15T03:38:00.719Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}