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Open Agent Skills that give coding agents senior-engineering judgment for designing, implementing, reviewing and investigating changes, with plugins for Claude Code and Codex.
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git clone https://github.com/zeybek/apex.gitApex is a set of Agent Skills that give a coding agent the judgment of a senior engineer when it designs, implements, reviews or investigates a change. The skills are plain files in the open Agent Skills format, so they work in any agent that reads them, and there are packaged plugins for Claude Code and Codex.
I started it because every agent session began the same way, with me typing the same paragraph about how I want a review done, what a migration plan has to cover, when to stop and ask. That paragraph became four skills, two read-only agents and an optional always-on engineering constitution. This site's own code reviews run through the reviewer and the investigator from Apex.
apex-design is for architecture, API, schema, migration and build-versus-buy decisions. apex-implement takes a feature, fix, refactor or migration end to end. apex-review does risk-first reviews and reports findings by severity. apex-investigate diagnoses incidents, regressions, flaky tests and bugs with no known cause before anyone touches the code. Each one activates only when the task calls for it, so a one-line fix doesn't get a design review.
The published package, for your client:
# Claude Code
claude
Or the skills on their own with the GitHub CLI's gh skill, still in preview, which also targets Cursor, Gemini CLI and most other agents:
gh skill install zeybek/apex
npx skills add zeybek/apex does the same through skills.sh. For anything else that reads skills, adapters/README.md has the discovery paths and the copy or symlink install.