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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()

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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()

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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

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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()

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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
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