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 skills add tetracoralla/math-anchor --skill calculategit 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/skills/tetracoralla/math-anchor/calculate)<a href="https://agentmods.dev/skills/tetracoralla/math-anchor/calculate"><img src="https://agentmods.dev/badge/skills/tetracoralla/math-anchor/calculate/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/skills/tetracoralla/math-anchor/calculate"><img src="https://agentmods.dev/badge/skills/tetracoralla/math-anchor/calculate.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 | $0.00083 | $0.01123 |
| Opus 5.5 | $0.00033 | $0.00449 |
| Sonnet 5.5 | $0.00017 | $0.00225 |
| Haiku 4.5 | $0.00008 | $0.00112 |
Grade A, and why
calculate 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.
How it starts
The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Calculate
Decide and route
- Do not load it for trivial, low-risk arithmetic the model can immediately verify.
- Treat fixed-width wrapping/saturating arithmetic as mandatory; do not classify them as trivial arithmetic.
- Always use it for fixed-width or IEEE-754 facts, exact/high-precision or symbolic work, matrices, units, statistics, probability, finance, verification, repeated calculations, or consequential results.
- Ask for a missing assumption when it changes the problem; a call must not hide ambiguity.
- The four tools are registered. Never call
list_mcp_resources, inspect source, or use a shell to find them. Usemath.runfor a known operation; otherwise search, then describe only if needed. - For an obligation DAG, failures-only checkpoint, or receipt replay, do not
search the MCP catalog. When this installed Skill contains the Host-generated
scripts/math-anchorlauncher, invoke it relative to this Skill directory withcheck-obligationsorreplay-obligations; retain receipts outside model context. Never substitute an ambient command or source checkout. If the launcher is absent, report that this carrier has no obligation checkpoint. - Every run uses the outer envelope
{operation, arguments}. Put all operation-specific fields insidearguments; never flatten them besideoperation.
Call these fully known routes directly; never search or describe these shapes first:
- Fixed-width arithmetic:
{"operation":"integer.machine_arithmetic","arguments":{"action":"add","left":"255","right":"2","bitWidth":8,"signedness":"unsigned","inputMode":"value","overflowBehavior":"wrapping"}} - Exact combinations/permutations:
{"operation":"combinatorics.count","arguments":{"action":"binomial","n":52,"k":5}} - Checkable polynomial identity:
{"operation":"certificate.polynomial_identity","arguments":{"left":"(x+1)^2","right":"x^2+2*x+1","variables":["x"]}}
Execute economically
- Use one
math.run,math.batchfor 2–32 independent ordered calculations, orfunction.samplefor one expression at many points. Batch is not a dependency graph. - For bulky output, select
resultModeand raisemaxOutputBytesonly when useful. - Control digits with
arguments.precision;precisionis not a top-levelmath.runfield. It counts significant digits. Exact fields stay exact. For decimal places, include integer digits plus at least two guard digits in the first call and round once for presentation. - Supply answer-changing variables, bounds, units, conventions, and tolerances.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 Changed · -7 lines · -26 tokens per session 5ce24ddbcf25
- 2mo ago First seen · 93 lines · 109 tokens per session scan A bbda7437b567
calculate is a skill published in the GitHub repository tetracoralla/math-anchor (0 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 83 tokens to every session and 1,123 once invoked, about $0.0003 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.
calculate compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| calculatetetracoralla/math-anchor | Skill | 0 | 1mo ago | Apache-2.0 | A | 83 | Codex |
| bdd-mathematical-verificationplurigrid/asi | Skill | 72 | 9d ago | MIT | A | 89 | OpenCode |
| journal-cover-letter-skill-trainerhujizhou35-cmd/journal-cover-letter-tutorial | Skill | 42 | 1mo ago | MIT | A | 110 | Codex |
| journal-cover-letter-skillhujizhou35-cmd/journal-cover-letter-tutorial | Skill | 42 | 1mo ago | MIT | A | 124 | Codex |
| matlab-use-scenario-buildermatlab/matlab-agentic-toolkit | Skill | 1.3k | 2d ago | none | A | 231 | Claude Code |
| cdopt-optimizationVeryMath/AI4Math-Optimization | Skill | 11 | 5d ago | MIT | A | 80 | Codex |
| matlab-simulate-radar-detectionsmatlab/matlab-agentic-toolkit | Skill | 1.3k | 2d ago | none | A | 92 | Claude Code |