> ## Documentation Index
> Fetch the complete documentation index at: https://gofastmcp.com/llms.txt
> Use this file to discover all available pages before exploring further.
# authorization
# `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.
## Functions
### `require_scopes`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
require_scopes(*scopes: str) -> AuthCheck
```
Require all of the given OAuth scopes.
### `restrict_tag`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
restrict_tag(tag: str) -> AuthCheck
```
Require scopes when the accessed component has a specific tag.
### `run_auth_checks`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
run_auth_checks(checks: AuthCheck | list[AuthCheck], ctx: AuthContext) -> bool
```
Run auth checks with AND logic.
## Classes
### `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:**
#### `tool`
```python theme={"theme":{"light":"snazzy-light","dark":"dark-plus"}}
tool(self) -> Tool | None
```
Backwards-compatible access to the component as a Tool.