name: Model Context Protocol (MCP) description: >- Model Context Protocol is an open, JSON-RPC 2.0 protocol from Anthropic that standardizes how AI applications (hosts) connect to external systems via servers that expose tools, resources, and prompts. MCP is positioned as "a USB-C port for AI applications" and has become the de-facto integration layer for Claude, ChatGPT, Cursor, Visual Studio Code, and a growing ecosystem of agent runtimes. This topic repo catalogs the canonical specification, the official multi-language SDKs, the reference server collection, community registries (Smithery, Pulse MCP, Naftiko Sandbox), and major MCP-aware clients, plus the vocabulary, JSON Schema, JSON-LD, and example payloads needed to reason about the protocol. url: https://github.com/api-evangelist/mcp humanURL: https://modelcontextprotocol.io image: '' tags: - Model Context Protocol - MCP - AI Agents - Tools - Resources - Prompts - JSON-RPC - Anthropic - Standards - Topic created: '2026-05-22' modified: '2026-05-22' specificationVersion: '0.18' type: Index apis: - name: MCP Specification description: >- The authoritative protocol definition for the Model Context Protocol, maintained at modelcontextprotocol.io and in the modelcontextprotocol/ specification GitHub repository. The TypeScript schema (schema.ts) is the source of truth, with an auto-generated JSON Schema (schema.json) for tooling. The current dated version is 2025-11-25. The protocol uses JSON-RPC 2.0 messages between hosts, clients, and servers and defines tools, resources, prompts, sampling, roots, elicitation, completion, and logging features. humanURL: https://modelcontextprotocol.io/specification baseURL: '' tags: - Specification - JSON-RPC - Schema - Protocol properties: - type: Documentation url: https://modelcontextprotocol.io/specification/2025-11-25 - type: GitHubRepository url: https://github.com/modelcontextprotocol/specification - type: JSONSchema url: https://github.com/modelcontextprotocol/specification/blob/main/schema/2025-11-25/schema.json - type: Versioning url: https://modelcontextprotocol.io/specification/versioning - name: MCP TypeScript SDK description: >- Official TypeScript SDK published as @modelcontextprotocol/sdk on npm. Dual-purpose library for building MCP servers and clients on Node.js, Bun, and Deno. Supports Standard Schema (Zod, Valibot, ArkType), stdio and Streamable HTTP transports, and ships thin middleware adapters for Express, Hono, and Node HTTP. The v2 line is in development. humanURL: https://github.com/modelcontextprotocol/typescript-sdk tags: - SDK - TypeScript - Node.js properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/typescript-sdk - type: SDK url: https://www.npmjs.com/package/@modelcontextprotocol/sdk - name: MCP Python SDK description: >- Official Python SDK published as `mcp` on PyPI. Includes the FastMCP high-level framework with decorators for tools, resources, and prompts; low-level server primitives for production; client SDK; OAuth 2.1 resource-server support; and stdio, SSE, and Streamable HTTP transports. Structured output is validated through Pydantic. humanURL: https://github.com/modelcontextprotocol/python-sdk tags: - SDK - Python - FastMCP properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/python-sdk - type: SDK url: https://pypi.org/project/mcp/ - name: MCP Java SDK description: >- Official Java SDK for building MCP servers and clients on the JVM. Maintained in the modelcontextprotocol/java-sdk repository. humanURL: https://github.com/modelcontextprotocol/java-sdk tags: - SDK - Java properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/java-sdk - name: MCP Kotlin SDK description: >- Official Kotlin SDK for MCP servers and clients targeting Kotlin and Android runtimes. humanURL: https://github.com/modelcontextprotocol/kotlin-sdk tags: - SDK - Kotlin properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/kotlin-sdk - name: MCP C# SDK description: >- Official C# SDK for .NET, maintained in collaboration with Microsoft. humanURL: https://github.com/modelcontextprotocol/csharp-sdk tags: - SDK - CSharp - .NET properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/csharp-sdk - name: MCP Swift SDK description: >- Official Swift SDK for MCP servers and clients on Apple platforms. humanURL: https://github.com/modelcontextprotocol/swift-sdk tags: - SDK - Swift properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/swift-sdk - name: MCP Rust SDK description: >- Official Rust SDK for MCP servers and clients. humanURL: https://github.com/modelcontextprotocol/rust-sdk tags: - SDK - Rust properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/rust-sdk - name: MCP Reference Servers description: >- Canonical collection of reference MCP server implementations maintained by the project. The active servers (Everything, Fetch, Filesystem, Git, Memory, Sequential Thinking, Time) demonstrate every server-side feature of the protocol and are recommended as the starting point for new implementers. humanURL: https://github.com/modelcontextprotocol/servers tags: - Reference - Servers - Examples properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/servers - name: MCP Inspector description: >- Developer tool for testing and debugging MCP servers. React-based web UI plus Node.js proxy, launched with `npx @modelcontextprotocol/inspector` and accessible at http://localhost:6274. Provides interactive testing of tools, resources, and prompts, plus a CLI mode for scripted testing. humanURL: https://github.com/modelcontextprotocol/inspector tags: - Tooling - Debugging - Inspector properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/inspector - type: CLI url: https://www.npmjs.com/package/@modelcontextprotocol/inspector - name: Official MCP Registry description: >- Community-driven, Anthropic-maintained registry that functions as an app store for MCP servers. Allows developers to publish server definitions and clients to discover them. Currently in API freeze at v0.1. Supports GitHub OAuth, GitHub OIDC, and DNS/HTTP ownership verification. humanURL: https://registry.modelcontextprotocol.io baseURL: https://registry.modelcontextprotocol.io tags: - Registry - Discovery properties: - type: GitHubRepository url: https://github.com/modelcontextprotocol/registry - type: APIReference url: https://registry.modelcontextprotocol.io/docs - name: Smithery description: >- Third-party MCP server registry and hosted runtime. Catalogs community-built MCP servers, generates installation snippets for clients like Claude Desktop and Cursor, and can host servers on Smithery's infrastructure. Acts as a primary discovery surface alongside the official registry. humanURL: https://smithery.ai tags: - Registry - Hosted - Discovery properties: - type: Portal url: https://smithery.ai - name: Pulse MCP description: >- Third-party MCP directory and news site. Maintains a sub-registry API that implements the Generic MCP Registry API specification with PulseMCP-specific extensions for enriched metadata. humanURL: https://www.pulsemcp.com tags: - Registry - News - Discovery properties: - type: Portal url: https://www.pulsemcp.com - type: APIReference url: https://www.pulsemcp.com/api/docs/v0.1 - name: Claude Desktop (MCP Host) description: >- Anthropic's Claude Desktop application was the first MCP host. Connects to local MCP servers via stdio transport defined in claude_desktop_config .json and to remote servers via Streamable HTTP with OAuth 2.1. humanURL: https://claude.com/docs/connectors/building tags: - Client - Host - Claude properties: - type: Documentation url: https://claude.com/docs/connectors/building - name: Cursor (MCP Host) description: >- Cursor IDE supports MCP servers as a first-class extension mechanism, configured via mcp.json. Cursor is one of the most widely used MCP hosts for code-related workflows. humanURL: https://cursor.com/docs/context/mcp tags: - Client - IDE - Cursor properties: - type: Documentation url: https://cursor.com/docs/context/mcp - name: Visual Studio Code (MCP Host) description: >- VS Code's GitHub Copilot Chat integrates MCP servers as agents and tools. Microsoft has standardized on MCP for Copilot's agent-mode extensibility. humanURL: https://code.visualstudio.com/docs/copilot/chat/mcp-servers tags: - Client - IDE - VSCode properties: - type: Documentation url: https://code.visualstudio.com/docs/copilot/chat/mcp-servers - name: ChatGPT (MCP Host) description: >- OpenAI's ChatGPT supports MCP through the Apps SDK and developer tooling documented at developers.openai.com, making MCP a cross-vendor surface for connecting tools and data to ChatGPT. humanURL: https://developers.openai.com/api/docs/mcp/ tags: - Client - Host - OpenAI properties: - type: Documentation url: https://developers.openai.com/api/docs/mcp/ common: - type: Portal url: https://modelcontextprotocol.io - type: Documentation url: https://modelcontextprotocol.io/introduction - type: GitHubOrganization url: https://github.com/modelcontextprotocol - type: GitHubRepository url: https://github.com/modelcontextprotocol/specification - type: Vocabulary url: vocabulary/mcp-vocabulary.yml - type: JSONLD url: json-ld/mcp-context.jsonld - type: Features data: - name: JSON-RPC 2.0 Base Protocol description: >- MCP defines request, response, and notification message shapes on top of JSON-RPC 2.0 with strict rules on IDs and structure. - name: Stateful Sessions description: >- Clients and servers negotiate capabilities during the initialize handshake and maintain stateful connections for the lifetime of the session. - name: Tools description: >- Servers expose callable tools with JSON Schema 2020-12 input schemas; clients invoke them via tools/call. - name: Resources description: >- Servers expose URI-addressable context (files, database rows, API responses) via resources/list, resources/read, and subscription notifications. - name: Prompts description: >- Servers expose templated prompts and workflows via prompts/list and prompts/get for users to invoke. - name: Sampling description: >- Clients can offer sampling/createMessage so servers can ask the host LLM to run agentic, recursive inference under user consent. - name: Roots description: >- Clients can advertise filesystem roots that bound a server's operating scope via roots/list. - name: Elicitation description: >- Servers can request additional information from users mid-session via elicitation/create. - name: Multiple Transports description: >- MCP defines stdio for local processes and Streamable HTTP (with an optional SSE legacy mode) for networked deployments. - name: OAuth 2.1 Authorization description: >- HTTP-based transports follow an MCP-defined OAuth 2.1 authorization framework; stdio transports retrieve credentials from the environment. - name: Icons and Branding description: >- Implementations, tools, prompts, and resources can publish icon metadata for richer UIs, with strict security constraints on icon URIs. - name: Reserved _meta Namespace description: >- MCP reserves the _meta property with a structured prefix/name format for attaching additional metadata to interactions. - type: UseCases data: - name: IDE Augmentation description: >- MCP servers extend coding assistants like Cursor, VS Code Copilot, and Claude Code with project-aware tools, repository search, and terminal/build access. - name: Knowledge Base Access description: >- MCP resources surface documentation, wikis, and structured data stores to AI hosts under user consent. - name: Workflow Automation description: >- MCP tools let agents trigger build pipelines, send notifications, create tickets, and orchestrate multi-step business workflows. - name: Enterprise Connectors description: >- Vendors expose enterprise systems (CRMs, ITSM, data warehouses) as MCP servers so that any MCP-aware host can connect without bespoke integration code. - name: Local Computer Use description: >- Local MCP servers expose filesystem, git, shell, browser, and desktop automation tools to assistants running on the same machine. - type: Integrations data: - name: Anthropic Claude description: >- Claude Desktop, Claude Code, and the Claude API are first-class MCP hosts and are the protocol's reference consumers. - name: OpenAI ChatGPT description: >- ChatGPT supports MCP through the Apps SDK and OpenAI's developer docs. - name: Cursor description: >- Cursor IDE consumes MCP servers via mcp.json configuration. - name: Visual Studio Code description: >- VS Code's Copilot Chat treats MCP servers as agents and tools. - name: MCPJam description: >- MCPJam is a community client implementation for testing MCP servers interactively. - name: Naftiko Sandbox description: >- Naftiko Sandbox is a governed MCP host that compiles capability definitions into sandboxed MCP servers running in containers with policy enforcement. - type: Solutions data: - name: Spec, SDKs, and Reference Servers description: >- modelcontextprotocol.io publishes the spec, schema, official SDKs for TypeScript, Python, Java, Kotlin, C#, Swift, and Rust, plus a set of reference servers and an Inspector debugging tool. - name: Official Registry description: >- The official MCP Registry is a central index of MCP servers with GitHub OAuth/OIDC and DNS-based ownership verification. - name: Third-Party Registries description: >- Smithery and Pulse MCP provide alternative discovery surfaces and, in Smithery's case, hosted execution of community servers. - name: Vendor Hosts description: >- Claude, ChatGPT, Cursor, VS Code Copilot, Continue, Cline, Zed, Windsurf, and many other assistants act as MCP hosts. maintainers: - FN: Kin Lane email: kinlane@gmail.com url: http://kinlane.com