Developer Tools MCP servers

caniuse MCP — browser feature support tables

Cloudflare Workers MCP server: interactive-api-playground

Your coding agents are isolated in worktrees; your breakage is not.

Bundlephobia MCP — npm bundle-size analysis

Cloudflare Workers MCP server: api-changelog-tracker

APIs.guru MCP — keyless directory of 2,500+ public APIs and their OpenAPI specs. https://apis.guru

Edge Case Museum MCP — 'Your code works. Except for these wonderfully terrible inputs.'

Cloudflare Workers MCP server: code-pattern-risk-scanner

Cloudflare Workers MCP server: api-composition-gateway

deps.dev MCP — Google's package metadata + dependency graph API.

Cloudflare Workers MCP server: ai-rate-limit-tracker

Repology MCP — cross-distro package version aggregator.

Packagist MCP — PHP / Composer package registry

Cloudflare Workers MCP server: a11y-scorer

Packagephobia MCP — install-size analysis for npm packages

httpbin MCP.

Vendor documentation and changelog change-tracking as ACCOUNT SIGNALS

tldr-pages MCP — fetched from the canonical github repo.

Technographics — what a website is built with, read from the page itself.

Sigstore Rekor — the public transparency log for software signatures.

RubyGems MCP — wraps the RubyGems.org public API (free, no auth)

PyPI MCP — wraps the Python Package Index (PyPI) JSON API (free, no auth).

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

Google PageSpeed Insights — runs Lighthouse against any public URL and returns the performance…

W3C MCP — web-standards lookup over w3c/browser-specs (GitHub, CF-reachable).

NuGet MCP — .NET package registry

MDN Search MCP

Open-source licenses MCP (SPDX).