/* Code highlighting -- target only inline code elements, not code blocks */
p code:not(pre code),
table code:not(pre code),
li code:not(pre code),
h1 code:not(pre code),
h2 code:not(pre code),
h3 code:not(pre code),
h4 code:not(pre code),
h5 code:not(pre code),
h6 code:not(pre code) {
  color: #f72585 !important;
  background-color: rgba(247, 37, 133, 0.09);
}

/* Banner styling -- improve readability with better contrast */
#banner {
  background: #f1f5f9 !important;
  color: #1e293b !important;
  font-size: 0.95rem !important;
  font-weight: 600 !important;
  padding-top: 12px !important;
  padding-bottom: 12px !important;
  position: relative !important;
  overflow: hidden !important;
}

#banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    rgba(6, 182, 212, 0.25) 0%,
    rgba(6, 182, 212, 0.05) 25%,
    rgba(6, 182, 212, 0.35) 50%,
    rgba(6, 182, 212, 0.08) 75%,
    rgba(6, 182, 212, 0.28) 100%
  );
  background-size: 300% 100%;
  animation: colorWave 14s ease-in-out infinite alternate;
  pointer-events: none;
}

.dark #banner {
  background: #475569 !important;
  color: #f1f5f9 !important;
}

.dark #banner::before {
  background: linear-gradient(
    90deg,
    rgba(247, 37, 133, 0.35) 0%,
    rgba(247, 37, 133, 0.08) 25%,
    rgba(247, 37, 133, 0.45) 50%,
    rgba(247, 37, 133, 0.12) 75%,
    rgba(247, 37, 133, 0.38) 100%
  );
  background-size: 300% 100%;
}

@keyframes colorWave {
  0% {
    background-position: 0% 0%;
  }
  100% {
    background-position: 100% 0%;
  }
}

#banner * {
  color: #1e293b !important;
  margin: 0 !important;
}

.dark #banner * {
  color: #f1f5f9 !important;
}

/* Version badge -- display a badge with the current version of the documentation */
.version-badge {
  display: inline-block;
  align-items: center;
  gap: 0.3em;
  font-size: 1em;
  margin-top: 0px;
  margin-bottom: 0px;
  padding-top: 6px;
  padding-bottom: 6px;
  padding-left: 20px;
  padding-right: 20px;
  font-family: "Inter", sans-serif;
  color: #ff5400;
  background: #fef2f2;
  border: 1px solid rgba(220, 38, 38, 0.3);
  border-radius: 12px;
  box-shadow: none;
  vertical-align: middle;
  position: relative;
  transition: box-shadow 0.2s, transform 0.15s;
}

.version-badge-container {
  margin: 0;
  padding: 0;
}

.version-badge:hover {
  box-shadow: 0 2px 8px 0 rgba(160, 132, 252, 0.1);
  transform: translateY(-1px) scale(1.03);
}

.dark .version-badge {
  color: #f1f5f9;
  background: #334155;
  border: 1px solid #64748b;
}


fastmcp.exceptions

FastMCPError

ValidationError

ResourceError

ToolError

PromptError

InvalidSignature

ClientError

NotFoundError

DisabledError

Classes

exceptions

[FastMCP Cloud](https://fastmcp.link/x0Kyhy2) is coming!

The fast, Pythonic way to build MCP servers and clients.

FastMCP

Welcome!

Welcome to FastMCP 2.0!

Installation

Quickstart

Updates

FastMCP Updates

Learn about the core FastMCP server class and how to run it.

FastMCP Servers

The FastMCP Server

Add cross-cutting functionality to your MCP server with middleware that can inspect, modify, and respond to all MCP requests and responses.

Middleware

MCP Middleware

Generate MCP servers from OpenAPI specs and FastAPI apps

OpenAPI Integration

Use FastMCP to act as an intermediary or change transport for other MCP servers.

Proxy Servers

Combine multiple FastMCP servers into a single, larger application using mounting and importing.

Composition

Server Composition

Learn how to use the FastMCP Client to interact with MCP servers.

Overview

Client Overview

Understand the different ways FastMCP Clients can connect to servers.

Transports

Client Transports

Learn about the advanced features of the FastMCP Client.

Advanced Features

Call FastMCP servers from the Anthropic API

Anthropic API

Anthropic API + FastMCP

Claude Desktop

Claude Desktop + FastMCP

OpenAI API

OpenAI API + FastMCP

Call FastMCP servers from the Google Gemini SDK

Gemini SDK

Gemini SDK + FastMCP

Community-contributed modules extending FastMCP

Contrib Modules

Create enhanced tool variants with modified schemas, argument mappings, and custom behavior.

Tool Transformation

Properly use instance methods, class methods, and static methods with FastMCP decorators.

Decorating Methods

Accessing and using HTTP requests in FastMCP servers

HTTP Requests

Learn how to test your FastMCP servers effectively

Testing

Testing MCP Servers

Learn how to use the FastMCP command-line interface

FastMCP CLI

An introduction to the core concepts of the Model Context Protocol (MCP), explaining what it is, why it's useful, and how it works.

What is MCP?

What is the Model Context Protocol (MCP)?

A step-by-step guide to building a Model Context Protocol (MCP) server using Python and FastMCP, from basic tools to dynamic resources.

Creating an MCP Server

How to Create an MCP Server in Python

A step-by-step guide to making any REST API with an OpenAPI spec available to LLMs using FastMCP.

fastmcp.cli

fastmcp.client

fastmcp.prompts

fastmcp.resources

fastmcp.server

fastmcp.tools

fastmcp.utilities

exceptions

`fastmcp.exceptions`

Classes

`FastMCPError`

`ValidationError`

`ResourceError`

`ToolError`

`PromptError`

`InvalidSignature`

`ClientError`

`NotFoundError`

`DisabledError`

fastmcp.cli

fastmcp.client

fastmcp.prompts

fastmcp.resources

fastmcp.server

fastmcp.tools

fastmcp.utilities

​fastmcp.exceptions

​Classes

​FastMCPError

​ValidationError

​ResourceError

​ToolError

​PromptError

​InvalidSignature

​ClientError

​NotFoundError

​DisabledError

`fastmcp.exceptions`

Classes

`FastMCPError`

`ValidationError`

`ResourceError`

`ToolError`

`PromptError`

`InvalidSignature`

`ClientError`

`NotFoundError`

`DisabledError`