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@ -4,6 +4,18 @@ This module provides the `MCPMixin` base class and associated decorators (`@mcp_
It allows developers to easily define classes whose methods can be registered as tools, resources, or prompts with a `FastMCP` server instance using the `register_all()`, `register_tools()`, `register_resources()`, or `register_prompts()` methods provided by the mixin.
Includes support for
Tools:
* [enable/disable](https://gofastmcp.com/servers/tools#disabling-tools)
* [annotations](https://gofastmcp.com/servers/tools#annotations-2)
* [excluded arguments](https://gofastmcp.com/servers/tools#excluding-arguments)
Prompts:
* [enable/disable](https://gofastmcp.com/servers/prompts#disabling-prompts)
Resources:
* [enable/disabe](https://gofastmcp.com/servers/resources#disabling-resources)
## Usage
Inherit from `MCPMixin` and use the decorators on the methods you want to register.
@ -17,10 +29,33 @@ class MyComponent(MCPMixin):
def tool_method(self):
return "Tool executed!"
# example of disabled tool
@mcp_tool(name="my_tool", description="Does something cool.", enabled=False)
def disabled_tool_method(self):
# This function can't be called by client because it's disabled
return "You'll never get here!"
@mcp_tool(
name="my_tool", description="Does something cool.",
annotations={
"title": "Attn LLM, use this tool first!",
"readOnlyHint": False,
"destructiveHint": False,
"idempotentHint": False
}
)
def tool_method(self):
return "Tool executed!"
@mcp_resource(uri="component://data")
def resource_method(self):
return {"data": "some data"}
# Disabled resource
@mcp_resource(uri="component://data", enabled=False)
def resource_method(self):
return {"data": "some data"}
mcp_server = FastMCP()
component = MyComponent()
@ -36,4 +71,4 @@ component.register_all(mcp_server, prefix="my_comp")
# Or 'my_tool' and 'component://data' are registered (if no prefix used)
```
The `prefix` argument in registration methods is optional. If omitted, methods are registered with their original decorated names/URIs. Individual separators (`tools_separator`, `resources_separator`, `prompts_separator`) can also be provided to `register_all` to change the separator for specific types.
The `prefix` argument in registration methods is optional. If omitted, methods are registered with their original decorated names/URIs. Individual separators (`tools_separator`, `resources_separator`, `prompts_separator`) can also be provided to `register_all` to change the separator for specific types.