mcp-login-oauth
OAuth 2.1 browser login for FastMCP servers that sit in front of another service. Clients that can't send a token header, such as claude.ai, the Claude desktop and mobile apps, log in once with a form. The form is checked by the service behind the server, for example a Trilium password, an InvoiceNinja email, password and 2FA code, or a Paperless username and password. The client then only holds opaque OAuth tokens. Your server turns each login into a grant, such as a service token minted at login, and reads it back in tool code.
The library provides:
- dynamic client registration, PKCE, refresh rotation and revocation, including revocation for public
clients, which the MCP SDK's own
/revokerejects; - a Fernet-encrypted file store that survives restarts;
- the login page with configurable fields, hints and collapsed sections for alternative logins, and honest dead-end pages for broken flows;
- tokens bound to this server (RFC 8707 resource indicators) and the issuer named on the code redirect (RFC 9207);
- protection against password guessing: a delay after each failed login, and login links that end after 5 failures or 10 minutes;
- optional static header tokens next to OAuth.
What this library stands for and where it is going are on the documentation site.
TypeScript? This library is Python only; TypeScript apps sign in with Better Auth, see Coming from TypeScript.
Used by trilium-mcp, invoiceninja-mcp, paperless-ngx-mcp and the recall engine in trilium-llm-wiki.
Install
From PyPI:
uv add mcp-login-oauth
Needs Python ≥ 3.12 and FastMCP ≥ 4.1.3.
Documentation: mcp-login-oauth.marceltov.de: getting started, the reference, behaviour, development and the design decisions.
License
Copyright © 2026 Marcel Bruckner.
Licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0-or-later). You may use, modify, and redistribute it, but any modified version — including one you run as a network service — must be released under the same license with its source made available to its users, and the original copyright notice preserved. See LICENSE for the full terms.
1 maintainer
Metadata
1 maintainer
Release files for mcp-login-oauth 0.2.2
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Total release size: 52.3 kB
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