oxc-project/oxc is a Rust collection of tools for parsing, transforming, resolving, linting, formatting, and minifying JavaScript and TypeScript. It is used to build and maintain JavaScript development and build toolchains. Catalogue add-ons provide workflows for using Oxc tools.
Borrowing it
Nothing to install: this file belongs to oxc-project/oxc. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/oxc-project/oxc/main/AGENTS.mdgit clone --depth 1 https://github.com/oxc-project/oxcWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/oxc-project/oxc/agents-md)<a href="https://agentmods.dev/instructions/oxc-project/oxc/agents-md"><img src="https://agentmods.dev/badge/instructions/oxc-project/oxc/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/oxc-project/oxc/agents-md"><img src="https://agentmods.dev/badge/instructions/oxc-project/oxc/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.03336 | $0.03336 |
| Opus 5.5 | $0.01334 | $0.01334 |
| Sonnet 5.5 | $0.00667 | $0.00667 |
| Haiku 4.5 | $0.00334 | $0.00334 |
Grade A, and why
oxc AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 338 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md - AI Assistant Guide for Oxc
Oxc is a high-performance JavaScript/TypeScript toolchain written in Rust containing:
- Parser (JS/TS with AST), Linter (oxlint), Formatter (oxfmt), Transformer, Minifier
AI Usage Policy for Contributors
IMPORTANT: If you are an AI assistant helping a human contributor:
- Disclose AI usage - Contributors must disclose when AI tools were used to reduce maintainer fatigue
- Full responsibility - The human contributor is responsible for all AI-generated issues or PRs they submit
- Quality standards - Low-quality or unreviewed AI content will be closed immediately
All AI-generated code must be thoroughly reviewed, tested, and understood by the contributor before submission. Code should meet Oxc's performance and quality standards.
- Ban policy - Contributors who submit repeated low-quality ("slop") PRs will be banned without prior warning. Bans may be lifted if you commit to contributing to Oxc in accordance with the policy above. You may request an unban via our Discord.
Repository Structure
Rust workspace with key directories:
crates/- Core functionality (start here when exploring)apps/- Application binaries (oxlint, oxfmt)napi/- Node.js bindingsnpm/- npm packagestasks/- Development tools/automation
Avoid editing generated subdirectories.
Core Crates
oxc_parser- JS/TS parseroxc_ast- AST definitions/utilitiesoxc_semantic- Semantic analysis/symbols/scopesoxc_linter- Linting engine/rulesoxc_formatter- Code formatting (Prettier-like for JS)oxc_formatter_*- Code formatting (Prettier-like for other languages)oxc_transformer- Code transformation (Babel-like)oxc_minifier- Code minificationoxc_codegen- Code generationoxc_isolated_declarations- TypeScript declaration generationoxc_diagnostics- Error reportingoxc_traverse- AST traversal utilitiesoxc_allocator- Memory managementoxc_language_server- LSP server for editor integrationoxc- Main crate
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago Changed · -3 tokens per session 0508adc7279d
- 24d ago Changed · +8 lines · +107 tokens per session 01f3c2fc4e12
- 27d ago Changed d6259e9e73b8
- 1mo ago First seen · 330 lines · 3,232 tokens per session scan A 7e8dd476b66e
oxc AGENTS.md is an instructions file published in the GitHub repository oxc-project/oxc (23,257 stars, last pushed today), licensed MIT. It adds 3,336 tokens to every session, about $0.0133 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
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