FastMCP Docs

Swagger-style documentation generator for FastMCP servers. Automatically creates beautiful, interactive API documentation from your FastMCP tools.

Features

• 🎨 Swagger-Style UI - Clean, modern interface similar to Swagger UI
• 🔍 Search Functionality - Quickly find tools by name, description, or tags
• 🏷️ Tag-Based Organization - Tools grouped by tags for easy navigation
• 📝 Auto-Generated - Extracts documentation from your FastMCP tools automatically
• ⚙️ Highly Configurable - Customize title, description, links, and more
• 🚀 Easy Integration - Simple 3-line setup
• 📚 OpenAPI Compatible - Generates OpenAPI 3.1.0 schema
• 🔄 Version Support - Compatible with both FastMCP v2 and v3

Installation

pip install fastmcp-docs

Quick Start

from fastmcp import FastMCP
from fastmcp_docs import FastMCPDocs
import asyncio

# Create your FastMCP server
mcp = FastMCP("My MCP Server")

# Register your tools
@mcp.tool(tags=["example"])
def hello_world(name: str = "World"):
    """Say hello to someone"""
    return f"Hello, {name}!"

# Setup documentation (3 lines!)
docs = FastMCPDocs(mcp, title="My MCP Tools")
asyncio.run(docs.setup())

# Run server
mcp.run()

That's it! Your documentation is now available at:

• UI: http://localhost:8000/docs
• OpenAPI: http://localhost:8000/openapi.json
• Tools API: http://localhost:8000/api/tools

Configuration

Basic Configuration

from fastmcp_docs import FastMCPDocs

docs = FastMCPDocs(
    mcp=mcp,
    title="My MCP Tools",
    version="1.0.0",
    description="API documentation for my awesome MCP server",
    base_url="https://api.example.com",
)

Adding Documentation Links

docs = FastMCPDocs(
    mcp=mcp,
    title="My MCP Tools",
    docs_links=[
        {"text": "GitHub Repository", "url": "https://github.com/..."},
        {"text": "User Guide", "url": "https://docs.example.com"},
        {"text": "API Reference", "url": "https://api.example.com/reference"}
    ]
)

Customizing the Favicon

# Use default favicon (green circle with M)
docs = FastMCPDocs(mcp, title="My Tools")

# Use custom favicon URL
docs = FastMCPDocs(
    mcp,
    title="My Tools",
    favicon_url="https://example.com/my-icon.ico"
)

# Use local favicon file
docs = FastMCPDocs(
    mcp,
    title="My Tools",
    favicon_url="/static/favicon.png"
)

Advanced Configuration

from fastmcp_docs import FastMCPDocs, FastMCPDocsConfig, DocsLink

# Create custom configuration
config = FastMCPDocsConfig(
    title="My MCP Tools",
    version="2.0.0",
    description="Advanced API documentation",
    base_url="https://api.example.com",
    docs_links=[
        DocsLink(text="GitHub", url="https://github.com/..."),
        DocsLink(text="Docs", url="https://docs.example.com")
    ],
    page_title_emoji="🤖",
    favicon_url="https://example.com/favicon.ico",

    # Customize route paths
    api_tools_route="/api/tools",
    openapi_route="/openapi.json",
    docs_ui_route="/docs",

    # OpenAPI settings
    openapi_version="3.1.0",
    openapi_servers=[
        {"url": "https://api.example.com", "description": "Production"},
        {"url": "https://staging.example.com", "description": "Staging"}
    ],

    # Options
    enable_cors=True,
    verbose=True
)

# Use custom config
docs = FastMCPDocs(mcp, config=config)

Adding Descriptions to Tool Parameters

To get parameter descriptions in the documentation, use type Annotated:

from typing import Annotated

@mcp.tool(tags=["greetings"])
def greet(
    name: Annotated[str, "Name of the person to greet"],
    greeting: Annotated[str, "Greeting to use"] = "Hello"
) -> str:
    """Greet someone with a custom message"""
    return f"{greeting}, {name}!"

Complete Example

from fastmcp import FastMCP
from fastmcp_docs import FastMCPDocs
from typing import Annotated
import asyncio

# Create server
mcp = FastMCP("My MCP Server")


@mcp.tool(tags=["deployment"], annotations={"title": "Deploy Application"})
def deploy(
    environment: Annotated[str, "Target environment (dev, staging, prod)"],
    version: Annotated[str, "Version to deploy"],
    dry_run: Annotated[bool = "Perform dry run without actual deployment"] = False
) -> str:
    """Deploy application to specified environment

    This tool deploys the application to the target environment
    with the specified version. Use dry_run to test without deploying.
    """
    if dry_run:
        return f"DRY RUN: Would deploy v{version} to {environment}"
    return f"Deployed v{version} to {environment}"

# Setup documentation
docs = FastMCPDocs(
    mcp=mcp,
    title="My FastMCP Tools",
    version="1.0.0",
    description="This is my FastMCP Tools Documention",
    base_url="https://mcp.example.com",
    page_title_emoji="🛠️",
    docs_links=[
        {"text": "Tools Guide", "url": "https://docs.example.com/tools-guide"}
    ]
)

# Run setup
asyncio.run(docs.setup())

# Start server
if __name__ == "__main__":
    mcp.run(transport="sse", host="0.0.0.0", port=8000)

API Routes

FastMCP Docs automatically creates the following routes:

Route	Description
/docs	Interactive Swagger-style UI
/openapi.json	OpenAPI 3.1.0 schema
/api/tools	List all tools with metadata
/api/tools/{tool_name}	Get specific tool details

Development

Local Installation

# Clone repository
git clone https://github.com/orco82/fastmcp-docs.git
cd fastmcp-docs

# Install in development mode
pip install -e ".[dev]"

Running Tests

pytest

Code Formatting

black fastmcp_docs/

License

MIT License - see LICENSE file for details

Contributing

Contributions are welcome! Please open an issue or submit a pull request.

Support

For issues and questions:

• GitHub Issues: https://github.com/orco82/fastmcp-docs/issues
• Documentation: https://github.com/orco82/fastmcp-docs/blob/main/README.md