Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/tetracoralla/math-anchor/claude-mdgit clone --depth 1 https://github.com/tetracoralla/math-anchorWhat 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 | $0.00140 | $0.00140 |
| Opus 5 | $0.00070 | $0.00070 |
| Sonnet 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 today.
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.
- today 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 6d ago), licensed Apache-2.0. It adds 140 tokens to every session, about $0.0007 per session on Opus 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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