wtf is 2x-skills?

2x-skills is a marketplace of add-on skills for Claude Code, the AI coding assistant, built and shared by Intercom's Fin 2x team. Skills are packaged instructions that teach Claude Code how to handle a specific kind of task well, and this repository bundles several of them into installable plugins. The skill-tools plugin is aimed at people who write their own skills: it includes a skill-review skill that judges a skill against a fixed set of seven quality categories, covering things like whether it is well structured, honest about what it does, adequately tested, secure, high quality in its writing, follows conventions, and reasonable in the cost it runs up, and it returns that judgment as structured data rather than free text. The security-tools plugin focuses on hardening GitHub Actions workflows, the automation scripts that run on GitHub, against attacks that try to inject malicious commands or exploit the software supply chain. It comes with a checklist covering fourteen specific rules plus commands to audit a workflow, and a hook that automatically loads the relevant guidance whenever you edit a workflow file. The claude-code-tools plugin offers meta tools for running Claude Code itself well: one checks your list of allowed permissions against a red, yellow, green safety model, another finds command line tools that are missing or behave differently between Mac and Linux systems and fixes the incompatibility, and a third gives a framework for analyzing how much your Claude Code usage is costing based on its own telemetry data. The test-tools plugin includes a skill for investigating and fixing flaky tests, meaning tests that sometimes pass and sometimes fail with no code changes, by detecting which testing framework and continuous integration provider you use and classifying the type of flake it found, across frameworks like RSpec, Jest, pytest, and Go's built in testing tool. The code-review-tools plugin runs a very strict structural review looking specifically for places code could be meaningfully simplified, rather than hunting for outright bugs or minor style issues, while the pr-tools plugin helps open well formed GitHub pull requests from Claude Code and attach screenshots or recordings to them. The whole collection is released under the MIT license.