Customization

Server metadata

You can define the MCP server name and description by modifying:

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    name="My API MCP",
    description="Very cool MCP server",
)
mcp.mount_http()

Tool and schema descriptions

When creating the MCP server you can include all possible response schemas in tool descriptions by changing the flag describe_all_responses, or include full JSON schema in tool descriptions by changing describe_full_response_schema:

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    name="My API MCP",
    description="Very cool MCP server",
    describe_all_responses=True,
    describe_full_response_schema=True
)

mcp.mount_http()

Customizing Exposed Endpoints

You can control which FastAPI endpoints are exposed as MCP tools using Open API operation IDs or tags to:

Only include specific operations
Exclude specific operations
Only include operations with specific tags
Exclude operations with specific tags
Combine operation IDs and tags

Code samples

The relevant arguments for these configurations are include_operations, exclude_operations, include_tags, exclude_tags and can be used as follows:

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    include_operations=["get_user", "create_user"]
)
mcp.mount_http()

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    exclude_operations=["delete_user"]
)
mcp.mount_http()

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    include_tags=["users", "public"]
)
mcp.mount_http()

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    exclude_tags=["admin", "internal"]
)
mcp.mount_http()

from fastapi import FastAPI
from fastapi_mcp import FastApiMCP

app = FastAPI()

mcp = FastApiMCP(
    app,
    include_operations=["user_login"],
    include_tags=["public"]
)
mcp.mount_http()

Notes on filtering

You cannot use both include_operations and exclude_operations at the same time
You cannot use both include_tags and exclude_tags at the same time
You can combine operation filtering with tag filtering (e.g., use include_operations with include_tags)
When combining filters, a greedy approach will be taken. Endpoints matching either criteria will be included

Getting Started

Configurations

Advanced Usage

Server metadata

Tool and schema descriptions

Customizing Exposed Endpoints

Code samples

Notes on filtering

​Server metadata

​Tool and schema descriptions

​Customizing Exposed Endpoints

​Code samples

​Notes on filtering

Server metadata

Tool and schema descriptions

Customizing Exposed Endpoints

Code samples

Notes on filtering