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Documentation Index

Fetch the complete documentation index at: https://claude.com/docs/llms.txt

Use this file to discover all available pages before exploring further.

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Getting started

Authentication is the most common stumbling block. Before you build, read the authentication reference—Claude’s auth support differs from the generic MCP spec in a few important ways.
Not sure whether to build an MCP server, a plugin, or both? See what to build.
Build with Claude. Install the official mcp-server-dev plugin in Claude Code—it walks you through building, testing, and packaging an MCP server interactively, using these docs as its reference.

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Key resources

  • SDK Examples: TypeScript and Python SDKs contain server implementation examples
  • Protocol Specification: modelcontextprotocol.io
  • Hosting Solutions: Platforms like Cloudflare offer remote MCP server hosting with autoscaling and OAuth management
  • Auth Specifications: Review the authorization spec with emphasis on third-party service flows

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Transport & authentication

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Supported transports

Claude supports both Streamable HTTP and the legacy HTTP+SSE transport. The legacy HTTP+SSE transport is being deprecated in favor of Streamable HTTP.

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Authentication features

  • Supports the 2025-03-26, 2025-06-18, and 2025-11-25 auth specifications
  • Dynamic Client Registration (DCR) enabled
  • OAuth callback: https://claude.ai/api/mcp/auth_callback (hosted surfaces); loopback redirect for Claude Code — see callback URLs
  • Token refresh and expiry support
  • Custom credentials for non-DCR servers

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Protocol features

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Supported

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Not yet supported

  • Resource subscriptions
  • Sampling
  • Advanced/draft capabilities

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Technical specifications

ConstraintLimit
Claude.ai/Desktop max tool result size~150,000 characters
Claude Code max tool result size25,000 tokens (configurable via MAX_MCP_OUTPUT_TOKENS)
Claude Code timeoutConfigurable via MCP_TOOL_TIMEOUT
Claude.ai/Desktop timeout300 seconds (5 minutes)
Transport protocolStreamable HTTP (legacy HTTP+SSE being deprecated)

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Testing your server

  1. Add directly to Claude via Settings > Connectors
  2. Use the MCP inspector tool to validate auth flows

MCP Overview

Understanding the Model Context Protocol.

Submit to Directory

Review requirements and submit your connector.