Model Context Protocol (MCP) Server Directory

Reverify (1,028 GitHub stars, trending September 2026) is an open-source MCP server that prevents AI agents from making things up — the agent proposes claims, deterministic tools decide, and every claim is checked against ground truth. Build your own FastMCP implementation with SQLite-backed fact verification, web search attestation, and numerical computation validation.

The x64dbg-MCP Server (1,913 stars, trending September 2026) is a native MCP plugin for x64dbg that exposes the debugger's full functionality to AI agents — breakpoints, memory reads, register state, disassembly, and step execution. Build your own FastMCP version for automated binary analysis workflows.

Lemmalog (294 GitHub stars, trending September 2026) is a Datalog engine for LLM agent memory that provides stratified rules, provenance-tracked facts, and incremental derivation. Build a FastMCP server that gives agents persistent, queryable memory with full provenance — every fact the agent knows includes a chain of reasoning back to its source.

Mistral's €3B Series D at €21B+ valuation marks the largest European tech funding round ever. The company's open-weight models — Mistral Small 4, Medium 3.5, OCR 4, and Voxtral TTS — represent the only full-stack sovereign AI stack. Build a FastMCP gateway server that serves these models via vLLM as drop-in agent tools for Claude Desktop, Cursor, and Windsurf, with data sovereignty guarantees baked into the tool routing layer.

Google DeepMind's WeatherNext 3, released September 2026 with 347 HN points, delivers hourly global weather forecasts using live satellite data with 1.4B parameters. Build a FastMCP server that provides real-time weather intelligence, forecast comparisons, and severe weather alerts as agent tools for logistics planning, outdoor operations, and emergency response workflows.

Figma Context MCP is the 15.8K-star server that delivers Figma layout information to AI coding agents like Cursor, Claude Desktop, and Windsurf. Build your own FastMCP implementation that fetches frames, computes computed layouts with absolute positions, extracts text styles, and exposes clean MCP tools for pixel-perfect design-to-code conversion.

HexStrike AI's MCP server gives LLM agents autonomous access to 150+ cybersecurity tools including Nmap, Metasploit, Burp Suite, and custom exploit scanners. Build a production-ready MCP security server with sandbox isolation and audit logging.

MCP-Scanner (168 HN points) automated the process of finding vulnerabilities in MCP servers. This build creates a FastMCP server that scans any MCP server for prompt injection, data exfiltration, unsafe tool calls, and resource abuse — then reports findings to Claude Desktop or Cursor.

WhatsApp MCP (229 HN points) brought messaging to AI agents. This build creates a FastMCP server for Twilio WhatsApp API integration, letting Claude and Cursor send messages, manage groups, and handle media from agent workflows.

Safari MCP (272 HN points) connects Safari's Web Inspector to Claude Desktop, giving AI agents live DOM inspection, network logging, console debugging, and performance profiling. Here's how to build and deploy it.

Vet (HN-viral) created a security registry for 88K+ MCP servers and AI tools. This build creates a Vet-inspired MCP server that scans, scores, and reports security vulnerabilities across the MCP ecosystem — protecting agents from malicious tools before they execute.

ControlFlow (42 HN points) brought open-source AI workflow orchestration to every developer. This MCP server wraps ControlFlow's task management engine behind FastMCP, letting Claude Desktop, Cursor, or any MCP client orchestrate multi-step AI workflows on demand.