Catch broken agent configs before your AI tools silently ignore them.
425 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%](https://vercel.com/blog/agents-md-outperforms-skills-in-our-agent-evals) without correct syntax. One wrong field and your skill is invisible.
**"Almost right" is the worst outcome.** [66% of developers](https://survey.stackoverflow.co/2025/ai) 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](https://arnav.tech/beyond-copilot-cursor-and-claude-code-the-unbundled-coding-ai-tools-stack).
**Bad patterns get amplified.** AI assistants don't ignore wrong configs - they [learn from them](https://www.augmentcode.com/guides/enterprise-coding-standards-12-rules-for-ai-ready-teams).
agnix validates all of it - 425 rules sourced from official specs, academic research, and real-world breakage patterns. Auto-fix included.
> **Want to try it first?** [Open the playground](https://agent-sh.github.io/agnix/playground) - paste any agent config, see diagnostics instantly. No install, runs in your browser.
## Quick Start
```console
$ 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
```bash
# 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](https://github.com/agent-sh/agnix/releases) | [All install options](https://agent-sh.github.io/agnix/docs/installation)
### Editor Extensions
| Editor | Install |
|--------|---------|
| **VS Code** | [VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=avifenesh.agnix) |
| **JetBrains** | [JetBrains Marketplace](https://plugins.jetbrains.com/plugin/30087-agnix) |
| **Neovim** | `{ "agent-sh/agnix", config = function() require("agnix").setup() end }` |
| **Zed** | Search "agnix" in Extensions |
[Editor setup guide](https://agent-sh.github.io/agnix/docs/editor-integration)
### GitHub Action
```yaml
- name: Validate agent configs
uses: agent-sh/agnix@v0
with:
target: 'claude-code'
```
## Usage
```bash
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](https://agent-sh.github.io/agnix/docs/configuration) | [Full rules reference](https://agent-sh.github.io/agnix/docs/rules)
## Supported Tools
| Tool | Rules | Count | Config Files |
|------|-------|-------|--------------|
| [Agent Skills](https://agentskills.io) | AS-\*, CC-SK-\* | 31 | SKILL.md |
| [Claude Code](https://docs.anthropic.com/en/docs/build-with-claude/claude-code) | CC-\* | 53 | CLAUDE.md, hooks, agents, plugins |
| [GitHub Copilot](https://docs.github.com/en/copilot) | COP-\* | 6 | .github/copilot-instructions.md, .github/instructions/\*.instructions.md |
| [Cursor](https://cursor.com) | CUR-\* | 16 | .cursor/rules/\*.mdc, .cursorrules, .cursor/hooks.json, .cursor/agents/\*\*/\*.md, .cursor/environment.json |
| [Kiro](https://kiro.dev) | 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](https://modelcontextprotocol.io) | MCP-\* | 12 | \*.mcp.json |
| [AGENTS.md](https://agentsmd.org) | AGM-\*, XP-\* | 13 | AGENTS.md, AGENTS.local.md, AGENTS.override.md |
| [Cline](https://docs.cline.bot) | CLN-\* | 4 | .clinerules, .clinerules/\*.md, .clinerules/\*.txt |
| [Gemini CLI](https://github.com/google-gemini/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](https://github.com/agent-sh/agnix/issues/new) | [Request a rule](https://github.com/agent-sh/agnix/issues/new) | [Good first issues](https://github.com/agent-sh/agnix/labels/good%20first%20issue)
## License
MIT OR Apache-2.0
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