MCP Auth Python SDK
MCP Auth Python SDK providing authentication middleware and utilities for building secure MCP servers — implementing OAuth 2.0, API key validation, and other auth flows in Python MCP server applications, enabling developers to add proper authentication to their custom MCP servers with minimal boilerplate.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Auth SDK — validate all tokens. Follow OAuth 2.0 best practices. Secure secret storage required. Review for CVEs before production.
⚡ Reliability
Best When
A developer building a Python MCP server that needs proper authentication — particularly for multi-user or publicly-accessible MCP deployments.
Avoid When
You're consuming MCP servers, not building them — or your MCP is local-only with no auth needs.
Use Cases
- • Adding OAuth 2.0 authentication to custom Python MCP servers
- • Implementing API key validation in MCP server middleware
- • Building multi-tenant MCP servers with per-user authentication
- • Securing MCP tool endpoints with role-based access control
- • Standardizing auth patterns across multiple Python MCP servers
- • Integrating with existing identity providers (Auth0, Okta) in MCP servers
Not For
- • Consuming MCP servers (this is for building/securing them)
- • TypeScript/JavaScript MCP servers (use mcp-auth/js instead)
- • Simple single-user local MCP servers (auth overhead not needed)
Interface
Authentication
This IS the auth library — implements OAuth 2.0 and API key auth for MCP servers. No auth required to use the SDK itself.
Pricing
Free, open source MIT-licensed SDK.
Agent Metadata
Known Gotchas
- ⚠ This is an SDK for building MCP servers, not an MCP server to consume
- ⚠ OAuth identity provider configuration required — SDK handles flows but not IdP setup
- ⚠ MCP Auth spec may evolve — check SDK version compatibility with MCP spec
- ⚠ Community organization (mcp-auth) — not official Anthropic/MCP spec
- ⚠ Token validation requires proper key management — follow cryptographic best practices
- ⚠ Multi-tenant use cases require careful scope and claim validation
Alternatives
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Scores are editorial opinions as of 2026-03-06.