Borrowing it
Nothing to install: this file belongs to tetracoralla/math-anchor. 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/tetracoralla/math-anchor/main/CLAUDE.mdgit clone --depth 1 https://github.com/tetracoralla/math-anchorWrote 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/tetracoralla/math-anchor/claude-md)<a href="https://agentmods.dev/instructions/tetracoralla/math-anchor/claude-md"><img src="https://agentmods.dev/badge/instructions/tetracoralla/math-anchor/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/tetracoralla/math-anchor/claude-md"><img src="https://agentmods.dev/badge/instructions/tetracoralla/math-anchor/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 | $0.00140 | $0.00140 |
| Opus 5.5 | $0.00056 | $0.00056 |
| Sonnet 5.5 | $0.00028 | $0.00028 |
| Haiku 4.5 | $0.00014 | $0.00014 |
Grade A, and why
math-anchor 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 2mo 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
Math Anchor Claude Code contract
@AGENTS.md
- Resolve technical implementation decisions autonomously from current source, runtime behavior, and the repository contract. This includes numeric limits, schema/handler alignment, parser behavior, error codes, refactor boundaries, tests, packaging, and runtime verification.
- Do not hand technical alternatives or raw implementation details to the owner for adjudication. Choose the smallest correct route, implement it, and report the result in plain language.
- Ask the owner only for product value or direction, visible experience preference, release/deploy/publication intent, credentials, spending, legal/privacy exposure, or another genuinely owner-only authorization.
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.
- 2mo ago First seen · 15 lines · 140 tokens per session scan A 006e5d092e5e
math-anchor CLAUDE.md is an instructions file published in the GitHub repository tetracoralla/math-anchor (0 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 140 tokens to every session, about $0.0006 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.
math-anchor CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| math-anchor CLAUDE.mdtetracoralla/math-anchor | Instructions file | 0 | 1mo ago | Apache-2.0 | A | 140 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode model-prompts.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 2,022 | GitHub Copilot |