Borrowing it
Nothing to install: this file belongs to shihongDev/evalyn. 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/shihongDev/evalyn/main/CLAUDE.mdgit clone --depth 1 https://github.com/shihongDev/evalynWrote 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/shihongdev/evalyn/claude-md)<a href="https://agentmods.dev/instructions/shihongdev/evalyn/claude-md"><img src="https://agentmods.dev/badge/instructions/shihongdev/evalyn/claude-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/shihongdev/evalyn/claude-md"><img src="https://agentmods.dev/badge/instructions/shihongdev/evalyn/claude-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 | $0.01345 | $0.01345 |
| Opus 5.5 | $0.00538 | $0.00538 |
| Sonnet 5.5 | $0.00269 | $0.00269 |
| Haiku 4.5 | $0.00135 | $0.00135 |
Grade B, and why
evalyn CLAUDE.md scanned grade B with 1 finding 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 1mo 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
(>2min), sudo is needed, or genuine blockers arise. How it starts
The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
When you start to build a new feature, please create a new branch. Once you finish, test and make sure it is ok, then merge the branch and clean
After you add new codes, at the end of the implementation, you should run the code simplifier
Everytime you change the functionalities of CLI, please review its corresponding tests and see if you need to make any change. After making all the changes, please review if any tests are failing and correct your code until the test pass.
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.
- 1mo ago First seen · 120 lines · 1,345 tokens per session scan B 6a0cef515291
evalyn CLAUDE.md is an instructions file published in the GitHub repository shihongDev/evalyn (258 stars, last pushed 4mo ago), licensed MIT. It adds 1,345 tokens to every session, about $0.0054 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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