Braintrust MCP

MCP discovered

Details

Endpoint: https://api.braintrust.dev/mcp
Transport: streamable-http
Docs: https://www.braintrust.dev/docs/integrations/developer-tools/mcp

Authentication

Braintrust API key bearer discovered Get token ↗

Authorization: Bearer <credential>

Create an API key in Settings > API keys. The API reference shows using it as Authorization: Bearer $BRAINTRUST_API_KEY. If you prefer the CLI flow, `bt setup` can create a new key interactively and prints an export BRAINTRUST_API_KEY=<key> command.

Braintrust OAuth login for CLI/MCP clients oauth2 discovered

OAuth · resolves from well-known metadata

Use `bt auth login` to open the browser-based Braintrust sign-in flow and save credentials to your keychain, or run `bt auth login --no-browser` on a headless server. For remote MCP clients, the Braintrust MCP docs state that OAuth is supported when you add the server without an Authorization header, and clients like Claude Desktop authenticate when you first use the server.