Agnix

agnix Lint agent configurations before they break your workflow

Catch broken agent configs before your AI tools silently ignore them.432 rules across Claude Code, Codex CLI, OpenCode, Cursor, Copilot, and more -validating CLAUDE.md, SKILL.md, hooks, MCP configs, and other agent files.

Auto-fix | GitHub Action | VS Code + JetBrains + Neovim + Zed

New rules and tool support ship constantly. Follow for real-time updates:

Why agnix?

Your skills don't trigger. Vercel's research found skills invoke at 0% without correct syntax. One wrong field and your skill is invisible.

"Almost right" is the worst outcome. 66% of developers cite it as their biggest AI frustration. Misconfigured agents produce exactly this.

Multi-tool stacks fail silently. Cursor + Claude Code + Copilot each want different formats. A config that works in one tool breaks in another.

Bad patterns get amplified. AI assistants don't ignore wrong configs - they learn from them.

agnix validates all of it - 432 rules sourced from official specs, academic research, and real-world breakage patterns. Auto-fix included.

> Want to try it first? Open the playground - paste any agent config, see diagnostics instantly. No install, runs in your browser.

Quick Start

$ npx agnix .
Validating: .

CLAUDE.md:15:1 warning: Generic instruction 'Be helpful and accurate' [fixable]
  help: Remove generic instructions. Claude already knows this.

.claude/skills/review/SKILL.md:3:1 error: Invalid name 'Review-Code' [fixable]
  help: Use lowercase letters and hyphens only (e.g., 'code-review')

Found 1 error, 1 warning
  2 issues are automatically fixable

hint: Run with --fix, --fix-safe, or --fix-unsafe to apply fixes

https://github.com/user-attachments/assets/72d5fe7c-476f-46ea-be64-5785cf6d5600

Install

# npm (recommended, all platforms)
npm install -g agnix

# Homebrew (macOS/Linux)
brew tap agent-sh/agnix && brew install agnix

# Cargo
cargo install agnix-cli

Pre-built binaries | All install options

Editor Extensions

| Editor | Install | |--------|---------| | VS Code | VS Code Marketplace | | JetBrains | JetBrains Marketplace | | Neovim | { "agent-sh/agnix", config = function() require("agnix").setup() end } | | Zed | Search "agnix" in Extensions |

Editor setup guide

GitHub Action

- name: Validate agent configs
  uses: agent-sh/agnix@v0
  with:
    target: 'claude-code'

Usage

agnix .              # Validate current directory
agnix --fix .        # Apply HIGH and MEDIUM confidence fixes
agnix --fix-safe .   # Apply only HIGH confidence fixes
agnix --fix-unsafe . # Apply all fixes, including LOW confidence
agnix --dry-run --show-fixes .  # Preview fixes with inline diff output
agnix --strict .     # Strict mode (warnings = errors)
agnix --target claude-code .  # Legacy target preset (primarily affects CC-* rules)
agnix --target kiro .         # Legacy target preset (use tools = [...] for tool-only filtering)

Full CLI reference | Full rules reference

Supported Tools

| Tool | Rules | Count | Config Files | |------|-------|-------|--------------| | Agent Skills | AS-\, CC-SK-\ | 31 | SKILL.md | | Claude Code | CC-\ | 53 | CLAUDE.md, hooks, agents, plugins | | GitHub Copilot | COP-\ | 6 | .github/copilot-instructions.md, .github/instructions/\.instructions.md | | Cursor | CUR-\ | 16 | .cursor/rules/\.mdc, .cursorrules, .cursor/hooks.json, .cursor/agents/\\/\.md, .cursor/environment.json | | Kiro | KIRO-\, KR-SK-\, KR-AG-\, KR-HK-\, KR-PW-\, KR-MCP-\ | 52 | .kiro/steering/\\/\.md, .kiro/skills/\\/SKILL.md, .kiro/agents/\.json, .kiro/hooks/\.kiro.hook, .kiro/settings/mcp.json, .kiro/powers/\/POWER.md | | MCP | MCP-\ | 12 | \.mcp.json | | AGENTS.md | AGM-\, XP-\ | 13 | AGENTS.md, AGENTS.local.md, AGENTS.override.md | | Cline | CLN-\ | 4 | .clinerules, .clinerules/\.md, .clinerules/\.txt | | Gemini CLI | GM-\ | 9 | GEMINI.md, GEMINI.local.md, .gemini/settings.json (hooks), gemini-extension.json (extensions), .geminiignore |

Architecture

Rust workspace crates:

• agnix-rules - rule metadata generated from knowledge-base/rules.json
• agnix-core - shared validation engine library
• agnix-cli - command-line interface binary
• agnix-lsp - language server binary
• agnix-mcp - MCP server binary
• agnix-wasm - WebAssembly bindings for browser/runtime integrations

Contributing

Contributions welcome. See [CONTRIBUTING.md](CONTRIBUTING.md) for the development guide.

Report a bug | Request a rule | Good first issues

License

MIT OR Apache-2.0

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Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: agent-sh
• Source: agent-sh/agnix
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.