Developer Tools & Repos MCP Servers

ISO 8601 duration MCP.

GitHub MCP — wraps the GitHub public REST API (no auth required for public endpoints)

GitLab MCP — wraps the GitLab REST API v4 (BYO API key)

Barcode / GTIN validation MCP (EAN-13, UPC-A, EAN-8, GTIN-14).

Hex.pm MCP — package registry for the Elixir & Erlang ecosystems.

Homebrew formulae.brew.sh MCP.

HTML entities MCP.

ISBN validation & conversion MCP.

LaunchDarkly MCP Pack — wraps the LaunchDarkly REST API v2

pub.dev MCP — package registry for Dart & Flutter.

Search the Plainsight playbook and review code against proven best practices.

LSP-backed IDE intelligence plus concurrency-safe, transactional edits for AI coding agents.

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Lean 4 MCP server: compile, prove theorems, and formalize math with Mathlib.

Detect npm download-pumping before adding a dependency: real usage vs inflated counter.

MCP server for serial port communication. 25 tools, resources, prompts, and stdio/HTTP transports.

Generate QR codes from text or URLs. Returns base64 PNG. x402 micropayment.

Generate QR codes for URLs, PIX, Wi-Fi, vCards, WhatsApp and more. For AI agents.

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Rails development skills, docs, and workflows exposed through MCP stdio.