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Documentation Index

Fetch the complete documentation index at: https://gofastmcp.com/llms.txt

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fastmcp.utilities.authorization

Authorization checks for FastMCP components. Auth checks are callables that receive an AuthContext and return True to allow access or False to deny it. They can also raise AuthorizationError to deny with a custom message; other exceptions are masked and treated as denial.

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Functions

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require_scopes 

require_scopes(*scopes: str) -> AuthCheck
Require all of the given OAuth scopes.

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restrict_tag 

restrict_tag(tag: str) -> AuthCheck
Require scopes when the accessed component has a specific tag.

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run_auth_checks 

run_auth_checks(checks: AuthCheck | list[AuthCheck], ctx: AuthContext) -> bool
Run auth checks with AND logic.

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Classes

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AuthContext

Context passed to auth check callables. Attributes:
  • token: The current access token, or None if unauthenticated.
  • component: The tool, resource, resource template, or prompt being accessed.
  • tool: Backwards-compatible alias for component when it is a Tool.
Methods:

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tool 

tool(self) -> Tool | None
Backwards-compatible access to the component as a Tool.