Model Context Protocol (MCP) Server Directory

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.

Engram and EGC (HN-viral MCP servers) showed the world that AI coding tools desperately need shared, persistent, offline memory. This build creates a FastMCP memory server that survives agent restarts, shares context across Cursor and Claude Desktop, and indexes everything with a local vector database.

Codebase Memory MCP by DeusData (42,000+ GitHub stars) indexes entire repositories into persistent knowledge graphs in milliseconds with 158-language support. Build a FastMCP server for AI agents to query code structure, find implementations, and navigate complex codebases.

Microsoft's official Playwright MCP server (36,000+ GitHub stars) brings production-grade browser automation to AI agents. Build a FastMCP server extension with multi-tab management, network interception, visual regression detection, and PDF generation for enterprise agent pipelines.

MathKernel is an evidence-aware multi-engine mathematics kernel and MCP server featured on Hacker News. Build a FastMCP server that combines symbolic (SymPy, Mathematica), numeric (NumPy, SciPy), and validation engines with cross-model consistency checks for AI agent mathematical reasoning.

PhiloLabs' Fable 5.1 open-sourced world model simulation hit 158 HN points. Build a FastMCP server that gives AI agents causal simulation, counterfactual planning, and predictive rollouts for enterprise operations.

Google's 863-HN-point Gemini 3.8 Flash Cyber detects CVEs without security prompt engineering. Build an MCP server that scans repos, dependencies, and infrastructure code for vulnerabilities autonomously.