Design a token-based permission system for MCP servers that restricts tool access per caller identity

MCP

MCP Server Authentication and Permission System: Claude Code Prompt

Design a token-based permission system for MCP servers that restricts tool access per caller identity

MCP

Write the TypeScript authentication and permission middleware for the MCP server in [YOUR_PROJECT].

Requirements:
**Token validation**: Each incoming MCP request must include a Bearer token in the MCP_AUTH_TOKEN header.

TLDR

Authentication and permission middleware for MCP servers. Validates caller tokens, maps identities to allowed tool lists, and logs access denials. Prevents unauthorized tool calls in multi-agent environments.

TLDR

How to use

1
Start by replacing [YOUR_PROJECT] with the actual name of your project to ensure the middleware is tailored specifically to your MCP server setup.
2
Use the provided structure for token validation and permission mapping to clearly define your permissions and identities, making it easier to manage access control.
3
After writing the wrapWithAuth function, test it thoroughly with various tokens and permissions to confirm that it correctly handles both access and denial scenarios in your MCP environment.

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