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 skills/morankor/theorist-toolbox/codex-mathnpx skills add morankor/theorist-toolbox --skill codex-mathgit clone --depth 1 https://github.com/morankor/theorist-toolboxWrote 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/morankor/theorist-toolbox/codex-math)<a href="https://agentmods.dev/skills/morankor/theorist-toolbox/codex-math"><img src="https://agentmods.dev/badge/skills/morankor/theorist-toolbox/codex-math.svg" alt="Measured on agentmods" 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 | $0.00079 | $0.00858 |
| Opus 5 | $0.00039 | $0.00429 |
| Sonnet 5 | $0.00016 | $0.00172 |
| Haiku 4.5 | $0.00008 | $0.00086 |
Grade A, and why
codex-math 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 5d 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 — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Math
Use Codex as an adversarial mathematical co-processor. The goal is not to sound convincing; the goal is to separate proved facts, real gaps, false alarms, and promising leads.
Treat every generated argument as a lead, not a verdict. A proof that looks polished can still be false. A reviewer objection can still be a false positive. Triage every finding.
Mode Selection
- Verify when the user provides a proof, theorem, lemma, or paper section and wants an audit.
- Write when the user provides a precise result and asks for a proof.
- Explore when the result may be false, under-specified, or hard enough that counterexample search and sufficient conditions are valuable.
For high-stakes claims, use two passes: one constructive pass and one hostile pass. In Codex environments that expose subagents, spawn independent verifier/explorer agents only when the user explicitly asks for parallel or independent agents.
Verify Mode
- Extract the exact statement, hypotheses, definitions, and proof block.
- Build a dependency list: equations, lemmas, citations, domain restrictions, and hidden regularity assumptions.
- Walk the proof step by step. Classify each step as:
OK: justified by a definition, prior result, explicit algebra, or standard theorem.GAP: a necessary implication is missing.ERROR: the step is false, with a counterexample or algebraic correction.UNCLEAR: the step might be right but needs a missing definition, citation, or convention.
- Check signs, dimensions, boundary cases, quantifiers, and whether examples are being used as proof.
- Triage findings. Report only issues you can explain concretely.
Verification output:
## Verdict
PASS | PASS WITH CAVEATS | FAIL | INCONCLUSIVE
## Findings
1. Severity: blocking | major | minor
Location:
Issue:
Why it matters:
Suggested fix:
## Checked
- Definitions:
- Algebra/signs:
- Edge cases:
- Citations or external results:
Write Mode
What ships with it
1 file 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.
- 5d ago First seen · 98 lines · 79 tokens per session scan A deba2f80f924
codex-math is a skill published in the GitHub repository morankor/theorist-toolbox (69 stars, last pushed 26d ago), licensed MIT. It adds 79 tokens to every session and 858 once invoked, about $0.0004 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 2026-08-30.
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