continuedev/continue · error · Error

No MCP server url found for authentication

Error message

No MCP server url found for authentication

What it means

FIM (fill-in-the-middle / code completion) on Vertex is only available through Codestral's rawPredict endpoint, so the adapter hard-rejects any model whose name doesn't contain 'codestral' before making the request.

Source

Thrown at core/context/mcp/MCPOauth.ts:303

    }
  } else {
    // Fallback: if no state or single context, use the first one
    const contexts = Array.from(authenticatingContexts.entries());
    if (contexts.length === 1) {
      [serverUrl, context] = contexts[0];
    }
  }

  if (!context || !serverUrl) {
    console.error("No matching authenticating context found for state:", state);
    return;
  }

  const { ide, serverId } = context;

  try {
    if (!serverUrl) {
      throw new Error("No MCP server url found for authentication");
    }
    if (!authorizationCode) {
      throw new Error(`No MCP authorization code found for ${serverUrl}`);
    }

    // Close the server before processing auth
    if (serverInstance) {
      await new Promise<void>((resolve) => {
        serverInstance!.close(() => {
          console.debug("Server for MCP Oauth process was closed");
          serverInstance = null;
          resolve();
        });
      });
    }

    const authProvider = new MCPConnectionOauthProvider(serverUrl, ide);
    await authProvider.ensureRedirectUrl();

View on GitHub (pinned to 5522c6f44c)

Solutions

1. Use a Codestral model id, e.g. 'codestral-2405' / 'mistral-codestral-*' as deployed in your Vertex endpoint
2. Route FIM requests for other model families to a provider that supports them (e.g. Mistral direct API)
3. Guard at the call site: check model.includes('codestral') before calling fimStream

Example fix

// before
api.fimStream({ model: 'gemini-1.5-pro', prompt, suffix }, signal);

// after
api.fimStream({ model: 'codestral-2405', prompt, suffix }, signal);

if (!body.model.includes('codestral')) throw new Error('FIM requires a codestral model');

const isFimCapable = (m: string): boolean => m.includes('codestral');

try { for await (const c of api.fimStream(body, signal)) {} } catch (e) { if ((e as Error).message.includes('Codestral')) { /* switch model or provider */ } throw e; }

When it happens

Trigger: Calling fimStream with any non-Codestral model: gemini, claude, or a plain mistral model id.

Common situations: Generic completion code pointed at the Vertex adapter with the default chat model; migrating FIM workflows from Mistral's direct API where other models were accepted.

Understand the failure class

• Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

Related errors

• No MCP authorization code found for ${serverUrl}
• URL is not defined in params
• Response body is null
• Profile ${profileId} not found
• No workspace directories found. Make sure you've opened a fo

AI-assisted analysis of continuedev/continue@5522c6f44c (2026-08-27). Data as JSON: /api/errors/75112a158b912779. Report an issue: GitHub.