lean

lean is a skill for Claude Code, Codex from WolframInstitute/ClaudePluginComputationalResearch. It costs 99 tokens per session (1,528 once invoked), scanned A, original, no licence file.

A workflow for proving mathematical statements in Lean 4, a programming language for writing machine-checked proofs, with the Mathlib library.

In plain words
What is it for?
Use it to formalize or check proofs, search Mathlib for lemmas, inspect Lean goals, and create a formalization checklist.
Why use it?
It helps turn a mathematical goal into a verified proof and find existing library results that can close it.

Skill for Claude CodeCodex

Part of the computational-research plugin — 21 skills, 23 commands, 1 hook shipped together

Install

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.

agentmods
npx agentmods add skills/wolframinstitute/claudeplugincomputationalresearch/lean
Any agent
npx skills add WolframInstitute/ClaudePluginComputationalResearch --skill lean
Clone the repo
git clone --depth 1 https://github.com/WolframInstitute/ClaudePluginComputationalResearch

Made for: Claude Code, Codex.

Or install computational-research, the plugin that ships this one along with the rest of its 21 skills, 23 commands, 1 hook.

Wrote 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.

agentmods badge for lean

README.md
[![agentmods](https://agentmods.dev/badge/skills/wolframinstitute/claudeplugincomputationalresearch/lean.svg)](https://agentmods.dev/skills/wolframinstitute/claudeplugincomputationalresearch/lean)
Your own site
<a href="https://agentmods.dev/skills/wolframinstitute/claudeplugincomputationalresearch/lean"><img src="https://agentmods.dev/badge/skills/wolframinstitute/claudeplugincomputationalresearch/lean.svg" alt="Measured on agentmods" height="20"></a>
Per session 99 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,528 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00099 $0.01528
Opus 5 $0.00049 $0.00764
Sonnet 5 $0.00020 $0.00306
Haiku 4.5 $0.00010 $0.00153

Measured 4d ago against content hash d9033211e0ba, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

lean 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 4d 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.

skills/lean/SKILL.md · 128 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 4d ago First seen · 128 lines · 99 tokens per session scan A d9033211e0ba

Subscribe to this mod's changes

lean is a skill published in the GitHub repository WolframInstitute/ClaudePluginComputationalResearch (6 stars, last pushed 13d ago), with no licence file. It adds 99 tokens to every session and 1,528 once invoked, about $0.0005 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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