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The official OpenSearch Project MCP server (opensearch-mcp-server-py) that lets AI assistants query and operate OpenSearch clusters — listing indices, reading mappings, running Query DSL and PPL searches, inspecting shards and cluster health — over stdio or streaming transports, with basic-auth, AWS IAM, and header-based authentication.

Official PHP SDK for Model Context Protocol clients and servers, built with the PHP Foundation and Symfony project, published as `mcp/sdk` on Packagist, with framework-agnostic APIs, attribute discovery, manual registration, stdio and HTTP transports, sessions, tools, resources, prompts, sampling, and logs.

Official Python SDK for Model Context Protocol clients and servers, published as the `mcp` package on PyPI, with FastMCP server helpers, client support, tools, resources, prompts, stdio, SSE, Streamable HTTP, authentication, elicitation, sampling, logging, and standalone development tools.

Official Ruby SDK for Model Context Protocol clients and servers, published as the `mcp` gem with JSON-RPC handling, tool, prompt, and resource registration, stdio and Streamable HTTP transports, Rack/Rails integration, roots, sampling, elicitation, logging, cancellation, pagination, and RubyGems metadata.

Official Swift SDK for Model Context Protocol clients and servers, with Swift Package Manager installation, Swift 6+ support, Apple platform availability, MCP client and server APIs, stdio and HTTP transports, tools, resources, prompts, sampling, authentication, and conformance executables.

Official TypeScript SDK for Model Context Protocol clients and servers, with the production v1 `@modelcontextprotocol/sdk` package, active v2 server and client package work, Node.js, Bun, and Deno support, transports, OAuth helpers, tools, resources, prompts, examples, and API documentation.

ActiveCampaign's official server that wires Postmark into Claude over stdio, exposing 24 tools for outbound mail, template authoring, message lookup, bounce handling, and suppression list cleanup.

Adeu MCP server and SDKs translate DOCX files to token-efficient Markdown with CriticMarkup, apply safe Track Changes edits, and optionally integrate with live Microsoft Word on Windows.

Connect Claude to BorealHost's MCP server for hosting and infrastructure management — 47 tools spanning servers, domains, DNS, SSL, and deployments. Add it remotely with claude mcp add --transport http, or run it locally over stdio via pip install borealhost-mcp with a BOREALHOST_API_KEY.

Official CueAPI stdio MCP server for scheduling agent work, claiming executions, and reporting evidence-backed outcomes with verified handoffs across time and environments.

Apache-2.0 agentic proxy that can expose stdio, HTTP, SSE, and Streamable HTTP MCP servers through a managed gateway with federation, OAuth/JWT authentication, RBAC/CEL policy, CORS, TLS, observability, and Kubernetes Gateway API support.

Django extension that exposes MCP endpoints and stdio transport for Django apps, with declarative model query tools, custom toolsets, DRF create/list/ update/delete tool publishing, serializer output, and MCP inspection.

Open-source MCP gateway, registry, and proxy from IBM that federates MCP servers, A2A agents, REST APIs, and gRPC services behind centralized discovery, governance, authentication, observability, and admin controls.

Official Kagi MCP server that gives Claude web, news, video, podcast, image, and page-extraction tools backed by the Kagi Search and Extract APIs.

Document intelligence MCP server for extracting text, metadata, OCR output, structured data, embeddings, chunks, cache state, and supported-format information from PDFs, Office files, images, code, and many other formats.

MCP server that lets Claude and other MCP clients search and page through the official MCP Registry from a local stdio server.

MCP transport bridge that converts between stdio, SSE, and Streamable HTTP so local MCP clients can reach remote servers, or remote clients can reach local stdio servers.

No-key multi-engine MCP server, CLI, and local daemon for web search and public web content retrieval across engines such as Bing, DuckDuckGo, Brave, Exa, Baidu, CSDN, Juejin, Startpage, and Sogou.

MIT-licensed MCP proxy server that aggregates multiple downstream MCP servers behind one HTTP service, exposing each configured server through SSE or Streamable HTTP endpoints with auth tokens and tool filtering.

Source-backed KLinePic stdio MCP server for turning broker and exchange fills into annotated post-trade candlestick review charts, with capability discovery and no-charge request preflight before quota-consuming rendering.

AgentTrust stdio MCP server giving AI agents verified identity with email, instant messaging, and cloud file storage across 19 Ed25519-signed tools.

AnomalyArmor armor-mcp stdio server with 52 consolidated data observability tools for alerts, freshness, schema drift, quality metrics, lineage, and AI recommendations.

Manage Backlog projects from Claude — create and update issues, comment on tickets, manage wiki pages, review pull requests, and navigate your Nulab Backlog space — with the official Backlog MCP server supporting stdio and HTTP transports.

MIT-licensed Go implementation of the Model Context Protocol for building MCP servers and clients with tools, resources, prompts, stdio, SSE, Streamable HTTP, hooks, session management, validation, sampling, roots, and tracing.

Official Kotlin Multiplatform SDK for Model Context Protocol clients and servers, maintained in collaboration with JetBrains, with JVM, Native, JS, and Wasm targets, coroutine APIs, Gradle artifacts, Ktor integration, stdio, SSE, Streamable HTTP, WebSocket, tools, resources, prompts, sampling, and roots.

Official WordPress MCP adapter that bridges the WordPress Abilities API to Model Context Protocol tools, resources, and prompts for AI agents using HTTP or STDIO transports.

DataMerge native MCP server for B2B company enrichment, corporate hierarchies, contact search, and lookalike discovery across 375M+ companies via remote HTTP or local @datamerge/mcp stdio.

MCP server for connecting Claude to AFFiNE Cloud or self-hosted AFFiNE workspaces, documents, databases, comments, collections, folders, tags, notifications, blobs, access tokens, semantic page composition, templates, edgeless canvas data, and workspace organization workflows over stdio or HTTP.

Official Apify MCP server for connecting Claude to Apify Actors, Actor runs, datasets, key-value stores, and Apify documentation through hosted Streamable HTTP or local stdio transports.

Argo Project Labs MCP server for connecting Claude to Argo CD applications, clusters, managed resources, workload logs, events, sync operations, and resource actions through stdio or HTTP stream transports.