Connect AI Applications to Tools and Data
Model Context Protocol (MCP)
Servers expose capabilities as tools, resources, and prompts.
Host applications and clients connect against a protocol revision.
🔌 Give Models Tools and Data
A server exposes capabilities as tools, resources, and prompts: the model calls tools, the host application decides which resources enter the context, and the user picks prompts.
🛡️ Set Access Boundaries by Deployment
A local stdio server reads credentials from the environment. A local HTTP server binds to 127.0.0.1 and checks Origin. A multi-user server is configured as an OAuth 2.1 resource server and validates the token audience.
⚡ Choose a Transport
Messages are JSON-RPC over stdio or Streamable HTTP; actual support depends on the implementation. The 2026-07-28 revision drops the initialize handshake: each request carries its own protocol version and capabilities, so a server keeps no session between requests.
🌐 Publish and Discover Servers
The official MCP Registry holds server metadata for publishing, discovery, and use. The namespace in the server name, the login method, and the version rules decide whether you can publish and which version is latest.
🚀 Build with an SDK, Verify with the Inspector
Pick an SDK to write a server or client, then use the Inspector to check the connection, the protocol version, and the tools/list result.
💼 Stay Compatible Across Revisions
Clients and servers can speak different protocol eras. Before upgrading, read the versioning rules, key changes, and deprecations, then confirm which clients and extensions support what.
🎯 Start by Task
Start here
Learn what problem MCP solves, its core concepts and typical use cases.
Build
Implement a server or a client, pick an SDK, and connect it to a host application.
Upgrade
Move an implementation to the 2026-07-28 revision: read the versioning rules, the key changes and the deprecations first.
Diagnose
Find out why a server or client misbehaves: start with the debugging guide, reproduce with the Inspector, then script the check.
Secure
Settle authorization, harden local servers and learn the attack surface before you ship.
Compatibility
Check which protocol revisions, extensions and clients work together.
📰 Latest Technical Updates
Mastering MCP Tool Development: Unlocking AI Agent Potential
In today’s rapidly evolving AI agent landscape, tool quality directly determines the …
Update on the Next MCP Protocol Release
Release Timeline The next version of the Model Context Protocol specification will be released on …
MCP Apps in Practice: Wiring, Negotiation and Testing
The official announcement MCP Apps Now Official explains what MCP Apps are and why they exist. This …
Related Resources
Current documentation: English · 中文
MCP Documentation
Current developer documentation for MCP 2026-07-28.
MCP Specifications
The versioned protocol specification for current implementations.
Extensions
Official MCP extensions, including Apps, authorization, Tasks, and Skills.
MCP Registry
Publish, discover, and consume MCP server metadata.
Community
Contribute, discuss protocol changes, and join working groups.
ChatGPT Chinese
ChatGPT Chinese technology community.