Open Source

MCP Servers

10 open source servers for the Model Context Protocol. Install with npx, use with Claude Code, Cursor, or any MCP client.

tailscale-mcp

@yawlabs/tailscale-mcp
Infrastructure

Manage your Tailscale tailnet from AI assistants. 52 tools covering devices, ACLs, DNS, auth keys, users, webhooks, and network lock. HuJSON formatting preservation and ETag-safe ACL updates.

npx -y @yawlabs/tailscale-mcp
GitHub npm

ssh-mcp

@yawlabs/ssh-mcp
Infrastructure

MCP server for SSH operations with built-in diagnostics. Execute commands on remote hosts, transfer files, manage tunnels, and troubleshoot connectivity issues from any MCP client.

npx -y @yawlabs/ssh-mcp
GitHub npm

caddy-mcp

@yawlabs/caddy-mcp
Infrastructure

Manage Caddy web servers via the admin API. Configure reverse proxies, manage TLS certificates, update routes, and control Caddy instances from AI assistants.

npx -y @yawlabs/caddy-mcp
GitHub npm

lemonsqueezy-mcp

@yawlabs/lemonsqueezy-mcp
SaaS

Manage your LemonSqueezy store from AI assistants. Products, variants, orders, subscriptions, license keys, customers, discounts, webhooks, and checkout links.

npx -y @yawlabs/lemonsqueezy-mcp
GitHub npm

npmjs-mcp

@yawlabs/npmjs-mcp
Developer Tools

npm registry intelligence for AI assistants. Package search, security audits, dependency analysis, download stats, version comparison, and org management.

npx -y @yawlabs/npmjs-mcp
GitHub npm

tokenmeter-mcp

@yawlabs/tokenmeter-mcp
Free Tier

LLM spend tracking, cost estimation, and provider comparison. Track API costs across Anthropic, OpenAI, Google, Mistral, and more. Community tools are free with no account. Pro and Team tiers available.

npx -y @yawlabs/tokenmeter-mcp
tokenmeter.sh npm

ctxlint

@yawlabs/ctxlint
Developer Tools

Lint your AI agent context files, MCP server configs, and session data against your actual codebase. Catches broken paths, wrong commands, stale context, and token waste. Includes built-in MCP server.

npx -y @yawlabs/ctxlint
GitHub npm

mcp-connect

@yawlabs/mcp-connect
Ecosystem

MCP orchestrator. One install, all your MCP servers, managed from the cloud via mcp.hosting. Connect multiple servers through a single endpoint with centralized configuration.

npx -y @yawlabs/mcp-connect
GitHub npm

mcp-compliance

@yawlabs/mcp-compliance
Ecosystem

MCP spec compliance test suite. Tests any MCP server against the 2025-11-25 specification. CLI tool and MCP server for automated validation of tool schemas, error handling, and protocol behavior.

npx -y @yawlabs/mcp-compliance
GitHub npm

vend-mcp

@yawlabs/vend-mcp
Ecosystem

License key gating and usage metering for MCP servers in two lines. Add authentication, rate limiting, and monetization to any MCP server with the Vend SDK.

npx -y @yawlabs/vend-mcp
GitHub npm

Built by Yaw Labs

9 servers are MIT licensed and open source. Token Meter has a free community tier with no account required. All published on npm and maintained by Yaw Labs.