fastmcp.server.middleware.tool_injection
A middleware for injecting tools into the MCP server context.
Classes
ToolInjectionMiddleware
A middleware for injecting tools into the context.
The server this middleware is added to lists and calls the injected tools
alongside its own. They are resolved by the server’s tool lookup, so a
tool’s auth check and every middleware in the chain, including
AuthMiddleware, apply to them as they do to registered tools, wherever
this middleware sits in the chain. Server and session visibility settings
do not apply to injected tools.
Injected tools are matched by name alone; a requested version is ignored.
An injected tool takes precedence over a registered tool with the same
name, and the registered tool is no longer listed. When several injection
middleware provide the same name, the one added first takes precedence.
Injected tools follow their task configuration as registered tools do.
Methods:
injected_tools
get_injected_tool().