Skill

agnix

agnix is a linter for the files that configure coding agents, from the agent-sh organisation and licensed Apache 2.0.

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Checked 2026-11-10

agnix is a linter for the files that configure coding agents, from the agent-sh organisation and licensed Apache 2.0. The README says it checks CLAUDE.md, AGENTS.md, SKILL.md files, hooks and MCP configs against 760 rules across Claude Code, Codex CLI, OpenCode, Cursor, Copilot and others, with automatic fixes for some. You run npx agnix . in a project, or install it with npm, Homebrew, pip or Cargo, and it has a GitHub Action, editor extensions and a browser playground. It is a command-line tool rather than a skill that an agent loads, though it is filed under skills in our directory because of where it is listed. We would suggest it to anyone keeping many agent config files, because a wrong field in a skill file can make the agent ignore it without any error. The limit is that rules follow vendor formats that change often, so a warning is a prompt to check the current docs. It shows 477 stars and was last pushed on 9 November 2026. We have not run it ourselves.

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Questions

How do I install agnix?

Run this command: npm install -g agnix. The install box on this page has the command for each agent it works with.

Is agnix free?

It is published under the Apache 2.0 licence.

Who maintains agnix?

It is maintained by agent-sh. The code is at github.com/agent-sh/agnix.

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Prompts that use it

All prompts

  • Plan Before Coding Prompt

    • By AI Agent Duo

    Tested with Claude Code 2.1.316 (Sonnet), 2026-10-31, sample project; not run in other agents

  • Code Review Subagent

    • By AI Agent Duo

    Tested with Claude Code 2.1.316 (Sonnet), 2026-10-31, sample project, invoked through the main session

  • Bug Triage Prompt

    • By AI Agent Duo

    Tested with Claude Code 2.1.316 (Sonnet), 2026-10-31, sample project; not run in other agents

  • PR Description Command

    • By AI Agent Duo

    Tested with Claude Code 2.1.316 (Sonnet), 2026-10-31, sample project, run as a command from .claude/commands/pr.md

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