Model Context Protocol
An open protocol that enables seamless integration between LLM applications and external data sources and tools.
Explained projects
experimental-ext-grouping: MCP’s Folder System for Tools, Prompts, Resources, and Tasks
A protocol-level experiment in turning flat primitive lists into navigable groups, so clients can surface less noise, spend fewer tokens, and help models find the right capability faster.
experimental-ext-skills: Teaching MCP Servers to Ship the Manual
How the Skills Over MCP group is trying to make workflow instructions discoverable, portable, and light enough for agents to actually use.
modelcontextprotocol/ext-apps: Escaping the Chatbox Prison
How the Model Context Protocol standardized interactive, sandboxed UIs to turn AI clients into fully-fledged operating systems.
modelcontextprotocol/access: The GitOps Approach to Open Source Identity
How the fastest-growing AI protocol uses Pulumi and TypeScript to turn cross-platform community management into a single pull request.
The Invisible Handshake: Inside modelcontextprotocol/ext-auth
How a specification-as-code repository is building the enterprise security mesh for the agentic era by solving the AI login problem.
The AI Firewall: Inside experimental-ext-interceptors
How a proposed middleware extension is turning the Model Context Protocol from a raw communication channel into a secure, auditable standard.
The USB-C for AI Agents: Inside modelcontextprotocol/servers
How a standardized protocol and its reference implementations are ending the fragmented era of proprietary LLM tool integrations.
Yet to be explained
php-sdk
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The official PHP SDK for Model Context Protocol servers and clients. Maintained in collaboration with The PHP Foundation.
ext-skills
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MCP Extension for Skills discovery and distribution through MCP primitives. Maintained by the Skills Over MCP Working Group.
conformance
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Conformance Tests for MCP
financial-services-interest-group
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Financial Services Interest Group
ext-tasks
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This repository provides a reference for the tasks extensions to the MCP protocol, allowing for long-running operations, such as Agent communication, in MCP.
experimental-ext-triggers-events
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Incubation space for the MCP Triggers & Events Working Group
transports-wg
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Transports Working Group
progressive-disclosure-wg
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About experimental exploration of organization for MCP primitives. Maintained by the Primitive Grouping Interest Group.
experimental-ext-variants
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Status: Experimental. This repository provides a multi-language reference implementation of the variants proposal for the Model Context Protocol (MCP), as described in SEP-2053.
experimental-ext-tool-annotations
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Repository for the Tool Annotations Interest Group