agnix
The missing linter and lsp for AI coding assistants. Validate CLAUDE.md, AGENTS.md, SKILL.md, hooks, MCP. Plugin for all major IDEs included, with autofixes.
Stars: 60
Agnix is a tool designed to validate agent configurations before they disrupt your workflow. It offers 230 rules to check various agent files like CLAUDE.md, SKILL.md, hooks, and MCP configs. The tool aims to prevent AI tools from ignoring misconfigured agents by catching errors early. Agnix provides auto-fix functionality and supports multiple tools like Claude Code, Codex CLI, OpenCode, Cursor, and Copilot. It constantly updates its rules and tool support to ensure accurate validation of agent configurations.
README:
Catch broken agent configs before your AI tools silently ignore them.
230 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:
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 - 230 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.
$ 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 fixeshttps://github.com/user-attachments/assets/72d5fe7c-476f-46ea-be64-5785cf6d5600
# npm (recommended, all platforms)
npm install -g agnix
# Homebrew (macOS/Linux)
brew tap agent-sh/agnix && brew install agnix
# Cargo
cargo install agnix-cliPre-built binaries | All install options
| Editor | Install |
|---|---|
| VS Code | VS Code Marketplace |
| JetBrains | JetBrains Marketplace |
| Neovim | { "agent-sh/agnix.nvim" } |
| Zed | Search "agnix" in Extensions |
- name: Validate agent configs
uses: agent-sh/agnix@v0
with:
target: 'claude-code'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 . # Target specific toolFull CLI reference | All 230 rules
| 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 |
| MCP | MCP-* | 12 | *.mcp.json |
| AGENTS.md | AGM-*, XP-* | 13 | AGENTS.md, AGENTS.local.md, AGENTS.override.md |
| Gemini CLI | GM-* | 9 | GEMINI.md, GEMINI.local.md, .gemini/settings.json (hooks), gemini-extension.json (extensions), .geminiignore |
Rust workspace crates:
-
agnix-rules- rule metadata generated fromknowledge-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
Contributions welcome. See CONTRIBUTING.md for the development guide.
Report a bug | Request a rule | Good first issues
MIT OR Apache-2.0
Star this repo to help other developers find agnix.
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