microsoft/autogen · error · Error

Failed to fetch messages

Error message

Failed to fetch messages

What it means

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.

Source

Thrown at python/packages/autogen-studio/frontend/src/components/views/playground/api.ts:117

      }
    );
    const data = await response.json();
    if (!data.status)
      throw new Error(data.message || "Failed to delete session");
  }

  // Adding messages endpoint
  async listSessionMessages(sessionId: number, userId: string): Promise<any[]> {
    // Replace 'any' with proper message type
    const response = await fetch(
      `${this.getBaseUrl()}/sessions/${sessionId}/messages?user_id=${userId}`,
      {
        headers: this.getHeaders(),
      }
    );
    const data = await response.json();
    if (!data.status)
      throw new Error(data.message || "Failed to fetch messages");
    return data.data;
  }

  // New method to create a run
  async createRun(sessionId: number, userId: string): Promise<number> {
    const payload = { session_id: sessionId, user_id: userId };
    const response = await fetch(`${this.getBaseUrl()}/runs/`, {
      method: "POST",
      headers: this.getHeaders(),
      body: JSON.stringify(payload),
    });

    const data = await response.json();
    if (!data.status) throw new Error(data.message || "Failed to create run");
    return data.data.run_id;
  }
}

View on GitHub (pinned to 027ecf0a37)

Solutions

1. Confirm the endpoint exists on the backend (openapi docs / curl)
2. Verify session existence and ownership via getSession first
3. Read data.message for the concrete backend reason
4. Prefer the richer getSessionRuns endpoint if messages-only is optional in your UI

null

try {
  return await sessionAPI.listSessionMessages(sessionId, userId);
} catch {
  return []; // messages endpoint is auxiliary — degrade to empty
}

When it happens

Trigger: GET /sessions/{id}/messages for a nonexistent/unowned session, or a backend version without this route answering with the error envelope.

Common situations: Backend/frontend version skew (frontend ships the method before the backend route exists), deleted session, user mismatch.

Related errors

• Failed to fetch sessions
• Failed to fetch session
• Failed to create session
• Failed to update session
• Failed to fetch session runs

AI-assisted analysis of microsoft/autogen@027ecf0a37 (2026-08-15). Data as JSON: /api/errors/23618778e7629a5d. Report an issue: GitHub.