Borrowing it
Nothing to install: this file belongs to stblake/mathilda. 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/stblake/mathilda/main/CLAUDE.mdgit clone --depth 1 https://github.com/stblake/mathildaWrote 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/stblake/mathilda/claude-md)<a href="https://agentmods.dev/instructions/stblake/mathilda/claude-md"><img src="https://agentmods.dev/badge/instructions/stblake/mathilda/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/stblake/mathilda/claude-md"><img src="https://agentmods.dev/badge/instructions/stblake/mathilda/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 | $0.04253 | $0.04253 |
| Opus 5.5 | $0.01701 | $0.01701 |
| Sonnet 5.5 | $0.00851 | $0.00851 |
| Haiku 4.5 | $0.00425 | $0.00425 |
Grade A, and why
mathilda CLAUDE.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 3d 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.
The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 3d ago Changed · +57 tokens per session adb16a3efc8c
- 11d ago Changed · +1 lines · +95 tokens per session dd525d80672f
- 16d ago Changed · +1 lines · +281 tokens per session fcfe24de7ef0
- 1mo ago Changed · +2 lines · +269 tokens per session e1cdc70f3011
- 1mo ago Changed · +2 lines · +356 tokens per session a4e6e6a2c3a6
- 1mo ago First seen · 148 lines · 3,195 tokens per session scan A a94aaab1f25a
mathilda CLAUDE.md is an instructions file published in the GitHub repository stblake/mathilda (20 stars, last pushed today), licensed GPL-3.0. It adds 4,253 tokens to every session, about $0.0170 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.
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