Borrowing it
Nothing to install: this file belongs to jl-cmd/claude-dev-env. 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/jl-cmd/claude-dev-env/main/AGENTS.mdgit clone --depth 1 https://github.com/jl-cmd/claude-dev-envWrote 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/jl-cmd/claude-dev-env/agents-md)<a href="https://agentmods.dev/instructions/jl-cmd/claude-dev-env/agents-md"><img src="https://agentmods.dev/badge/instructions/jl-cmd/claude-dev-env/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/jl-cmd/claude-dev-env/agents-md"><img src="https://agentmods.dev/badge/instructions/jl-cmd/claude-dev-env/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 | $0.00406 | $0.00406 |
| Opus 5.5 | $0.00162 | $0.00162 |
| Sonnet 5.5 | $0.00081 | $0.00081 |
| Haiku 4.5 | $0.00041 | $0.00041 |
Grade A, and why
claude-dev-env 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 14d 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.
What it actually says
Code Review Rules
Read docs/review/review.md before reviewing this repository. Apply current changed repository instructions before copied hosted policy.
Do not add code comments. Preserve existing comments. Docstrings remain allowed. When a change touches code that an existing comment describes or is attached to, remove that comment in the same change and carry its meaning through clear names and structure. Leave comments tied to untouched code unchanged. Keep comment cleanup inside the requested task. Production and tests follow one rule. Changed directive, TODO, FIXME, HACK, XXX, and type-ignore comments are removed. Do not add or justify them.
Banned word: real
Never write real, really, or real-world. Not in chat, not in a commit message, not in a pull request body, not in a comment, not in documentation, not in a heading, not in a variable name. This ban has no exception. Emphasis is not an exception. Contrast with a test, a mock, a fixture, or a hypothetical is not an exception. Insisting that something is genuine is not an exception.
Every sentence carrying real says the same thing without it. One real failure is one failure. The real cause is the cause. Really fast is fast, or the measured number. Real users is users. A real bug, not a flake is a bug, followed by the evidence that rules out a flake.
Delete the word, then read the sentence. When it still says what you meant, you are done. When something is missing, the missing part is evidence, so name the evidence. The failing check. The log line. The measured number. The file and the line.
Swapping in actual, actually, genuine, or true is the same move, and each is banned with it. So is the invented contrast that invites the word back, such as "not a hypothetical problem but a problem".
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.
- 14d ago Changed · +2 tokens per session cf391bdda3a2
- 16d ago Changed · +5 lines · +36 tokens per session 2cb56062369e
- 1mo ago Changed · +10 lines · +274 tokens per session c13b4176699c
- 1mo ago Changed · -71 lines · -1,984 tokens per session scan B → A b03047e13e26
- 1mo ago First seen · 75 lines · 2,078 tokens per session scan B 150c08bfc13d
claude-dev-env AGENTS.md is an instructions file published in the GitHub repository jl-cmd/claude-dev-env (6 stars, last pushed 13d ago), licensed MIT. It adds 406 tokens to every session, about $0.0016 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 2026-08-31.
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