adding-authentication-to-a-tool.md

Adding Authentication to a Tool

To add authentication to a tool, you need to update the tool's manifest to include the require_auth property.

For example, your manifest.json might look like this:

{
  "name": "example_tool",
  "version": "1.0.0",
  "entry_function": "example_tool",
  "require_auth": true <-- This indicates that the tool requires authentication.
}

Using the User's Access Token

After adding the require_auth property to the manifest, you can use the user's access token within your tool by importing and calling the get_access_token function from fastmcp.server.dependencies. For example:

from fastmcp.server.dependencies import get_access_token

token = get_access_token()

# Access token will be available at `token.token`