MCP developer tools
Every listing tagged mcp, A to Z: 33 tools across 5 categories. Listed in alphabetical order, not ranked.
ADRs4AI
Method, repo template and VS Code extension for keeping the reasoning from human-AI work in Git: your agent turns your notes into Architectural Deliberation Records and asks open questions with options, a recommendation, rationale, confidence and a falsifier, which you accept or override; the extension's MCP server lets agents query the record.
Agentic Resource Registry
Self-hosted, open-source (Apache-2.0) registry for sharing a team's coding agent resources (skills, agent files, MCP servers) with usage insights; works with Claude Code, Kiro, Cursor, Codex, Pi and more through the observal CLI. Formerly Observal.
Apify
Web scraping and automation platform: thousands of ready-made scrapers (Actors) in the Apify Store plus your own, with proxies, storage and scheduling, and an MCP server so agents can run any Actor. Apify also maintains the open-source Crawlee library. Free plan with $5 of usage a month.
Bifrost
Open-source (Apache-2.0) AI gateway from Maxim AI: one OpenAI-compatible API for thousands of models with failover, load balancing, semantic caching, virtual keys, budgets and an MCP gateway; Enterprise plan available.
Braus
Mac app that gives AI agents their own desktop workspace to work in apps that have no API, while you keep using your Mac; connect Claude Code or Codex over MCP. Formerly Mecum.
CATT
Consumer Agent Testing Tool: open-source (MIT) Python CLI that runs a scripted or model-driven surrogate assistant (Muse or Instinct emulation, unaffiliated) against your MCP server, MCP app, website or HTTP API, checks what the service actually did and records sealed evidence you can replay and diff in CI.
Chiplab
MCP platform from Veecle that lets AI agents compile, simulate and validate firmware on the actual target chip without physical hardware; in beta.
Context.dev
Web data API for AI agents: scrape any URL into LLM-ready Markdown, search the live web, crawl and map sites, monitor pages for changes and pull brand data, with SDKs, a CLI and an MCP server; free credits to start.
CoreSpeed
One MCP endpoint that gives Claude Code, Codex or Cursor your apps, your team's shared memory and built-in tools, with spend caps, approvals and an activity log; free plan, Pro $20/month.
DocuMemory
Memory engine for AI-first engineers: distils Claude Code, ChatGPT and Cursor sessions into architecture decisions and prompt-injectable context blocks, recalled over MCP or a REST API; 15 free distillations, then from $10/month.
Etchv
Invisible forensic watermarking API for images, PDFs and video, written by a neural model and detectable after resizing and cropping; SDKs for Python, Node.js, Go, Rust, C# and Java plus an MCP server.
Exa
Web search API for AI: real-time search with page contents, deep multi-step search, answers with citations, monitors and an async research agent, plus a hosted MCP server. Pay as you go, with $10 in free credits every month.
Floot
Build full-stack apps from inside Claude, ChatGPT or Cursor: Floot handles the backend, database, logins, hosting and publishing to web, iOS and Android, with no AI credits to buy; backed by Y Combinator.
Hatamoto
Open-source (Apache-2.0) batteries-included CMS that runs as one Go binary next to Postgres 16: visual page builder, SEO panel, page cache, forms, redirects, JSON-LD, sitemaps and llms.txt in core, server-side AI crawler analytics that flag spoofed bots, an MCP server with scoped keys, sandboxed WebAssembly plugins and a WordPress importer that audits every old URL. No telemetry, no paid edition.
Karada.ai
Infrastructure for MCP: auto-compile APIs into Go MCP servers, keep tools in sync with CI/CD on every deploy, add composable plugins and multiplex everything behind one gateway; free Hobby plan, Pro from $19/month.
Kerno
AI runtime QA for backends: tests user flows against your real stack from inside MCP-capable coding agents.
MELRA
Open-source local MCP runtime that checks AI-agent tool calls against policy, gates risky actions on approval, verifies results and parks uncertain outcomes instead of blindly retrying after timeouts. Alpha; AGPL-3.0, SDKs Apache-2.0.
NitroStack
Full-stack MCP platform: open-source TypeScript and Python SDKs, an MCP CLI, the NitroStudio desktop app for testing and debugging, and NitroCloud managed hosting for production MCP servers and apps.
NOAN
Fact infrastructure for agentic companies: one API over REST and MCP for your verified business facts, read live by every agent, app and site; free plan, paid from $99/month.
phpClaw
Open-source (MIT) AI agent framework for PHP 8.1+: a ReAct loop with tools (allowlisted shell, HTTP with SSRF checks, sandboxed file access, database queries, code search), memory and guard chains that screen messages before the model sees them. Works with Anthropic, OpenAI, Groq, Gemini, Mistral, DeepSeek or Ollama; eight adapters for Laravel, Symfony, Drupal, Magento, WordPress/WooCommerce, Joomla, PrestaShop and OpenCart, and an MCP server package that exposes your tools to Claude Code or Cursor.
Pidgeon
Email inboxes for AI agents, hosted in the EU: one API call gives an agent its own address to send, receive and reply in threads, read attachments, book meetings and sign up for tools without your credentials, with a firewall that flags hidden instructions in inbound mail, scoped keys, a 90-day audit trail and human handoff. TypeScript SDK plus plugins or MCP for Claude Code, Codex, Cursor and Gemini CLI. Free plan (3 inboxes, 3,000 emails a month), Developer EUR 20/month, Startup EUR 200/month.
Playwright MCP
Microsoft's MCP server that lets Claude Code, Codex, Cursor, VS Code and other MCP clients drive a browser through Playwright's accessibility snapshots instead of screenshots: Chrome, Firefox, WebKit or Edge, headed or headless, or attached to your logged-in browser through an extension. Open source (Apache-2.0) and free.
Pomerado
Turns any website, from consumer sites to legacy portals, into a hosted API or MCP server for your agents, faster and more reliable than browser agents; open source and backed by Y Combinator.
ProvenMetal
Quote and order assembled PCBs from Codex or Claude through the ProvenMetal MCP server, at JLCPCB's own instant price with design checks and sourcing of parts JLCPCB doesn't stock.
Reticle
AI app testing that runs inside your app: it walks a flow like a user and reads network calls, app state and the console so your coding agent can verify its own work; free open-source SDK for Claude Code, Cursor and any MCP agent.
Skillstore
Searchable library of engineering skills behind an MCP server: Claude Code and Codex find and load the right expert instructions for the task as they work, and teams can keep a shared private skill library.
Statable
Privacy-friendly web analytics built for humans and AI agents: a simple dashboard, plus MCP access so Claude, Cursor or Codex can read reports and configure goals and funnels; no cookies, EU-hosted.
TablePro
Free, open-source (AGPL-3.0) native database client written in Swift, pitched as an open TablePlus: connects to 30+ SQL and NoSQL databases through native drivers, with built-in AI chat, inline suggestions and an MCP server for Cursor, Raycast or Claude Desktop (bring your own key or run Ollama). macOS and iOS/iPad; extras like iCloud Sync are paid, Linux version in development.
The MCP Census
Checks public evidence for an MCP server and returns PASS, REVIEW, BLOCK or UNKNOWN before you install or call it; lookup, preflight, whole .mcp.json config audits, a change feed, REST API and its own MCP endpoint, no account needed for stats.
Vitals
Activity Monitor alternative for Mac that groups processes by app, tracks coding agent sessions and AI usage limits, finds forgotten dev servers and exposes an MCP server; pay once, no subscription.
WhatsApp MCP
Open-source (MIT), read-only MCP server you deploy to your own Cloudflare account so Claude Code or any MCP client can search and read your WhatsApp chats; it can't send messages and is unofficial (uses the WhatsApp Web protocol).
Wraps
CLI and TypeScript SDK that deploys Resend-style email, SMS and CDN infrastructure (SES, Lambda, DynamoDB, EventBridge, CloudFront) into your own AWS account with one command; you pay AWS for sending and Wraps adds no per-email fee. Free plan, Pro $29/month, Business $199/month; MIT-licensed SDKs and an MCP server for agents.
Zernio
Marketing infrastructure for products and agents: one API and a hosted MCP server for social posts, ads, a unified inbox, WhatsApp, SMS and calls, built on official platform APIs; free up to two accounts.