> ## Documentation Index
> Fetch the complete documentation index at: https://docs.narrative.io/llms.txt
> Use this file to discover all available pages before exploring further.

# MCP Connect: Validation Failed

> The connection was authorized but a follow-up tools/list validation against the server failed.

**HTTP status:** 400

## When this error occurs

After the OAuth token exchange, the platform validates the new connection with a `tools/list` call using the fresh
token. This error means that validation failed — the token didn't actually grant access, or the server rejected the
authenticated request. The low-level detail is logged server-side under the response's `log_id`.

## How to fix

* Re-run the connection (`POST /mcp-connections`); the consent may not have granted the expected scope.
* Check the server's logs for the authenticated `tools/list` around the failure timestamp.