continuedev/continue · error · Error

Error getting prompt: MCP Connection ${serverName} not found

Error message

Error getting prompt: MCP Connection ${serverName} not found

What it means

The anthropic-on-Vertex streaming branch received a non-2xx response; the response body is JSON-stringified into the message. Represents an upstream HTTP failure during a streaming chat request.

Source

Thrown at core/context/mcp/MCPManagerSingleton.ts:195

  getStatuses(): (MCPServerStatus & { client: Client })[] {
    return Array.from(this.connections.values()).map((connection) => ({
      ...connection.getStatus(),
      client: connection.client,
    }));
  }

  setStatus(serverId: string, status: MCPServerStatus["status"]) {
    this.connections.get(serverId)!.status = status;
  }

  async getPrompt(
    serverName: string,
    promptName: string,
    args: Record<string, string> = {},
  ) {
    const connection = this.connections.get(serverName);
    if (!connection) {
      throw new Error(
        `Error getting prompt: MCP Connection ${serverName} not found`,
      );
    }
    return await connection.client.getPrompt({
      name: promptName,
      arguments: args,
    });
  }
}

View on GitHub (pinned to 5522c6f44c)

Solutions

1. Parse the embedded JSON body for Google's specific error reason
2. Enable the Anthropic model in Model Garden and grant the service account access
3. Verify model id format claude-*@<version> and region
4. Add retry with exponential backoff for 429/5xx around the stream start

try { for await (const c of api.chatCompletionStream(body, signal)) {} } catch (e) { const msg = (e as Error).message; if (/429|5\d\d/.test(msg)) await retryWithBackoff(); else throw e; }

When it happens

Trigger: 401/403 auth or missing model access (anthropic model not enabled in Vertex Model Garden); 404 bad model id; 429 quota; 400 malformed converted payload.

Common situations: Claude model not subscribed/enabled in the GCP project; wrong region for the Anthropic endpoint; token expiry during long-lived streaming sessions; quota exhaustion under load.

Related errors

• Unsupported transport type: ${this.options.type}
• MCP Connection ${serverId} not found
• no query params found
• No MCP authorization code found for ${serverUrl}
• Failed to fetch messages: ${response.statusText}

AI-assisted analysis of continuedev/continue@5522c6f44c (2026-08-27). Data as JSON: /api/errors/620e7819a8f12356. Report an issue: GitHub.