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 xuansenpa1/skillrevise --skill lean4-theorem-provinggit clone --depth 1 https://github.com/xuansenpa1/skillreviseWrote 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/xuansenpa1/skillrevise/lean4-theorem-proving)<a href="https://agentmods.dev/skills/xuansenpa1/skillrevise/lean4-theorem-proving"><img src="https://agentmods.dev/badge/skills/xuansenpa1/skillrevise/lean4-theorem-proving/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/xuansenpa1/skillrevise/lean4-theorem-proving"><img src="https://agentmods.dev/badge/skills/xuansenpa1/skillrevise/lean4-theorem-proving.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 | $0.00068 | $0.02144 |
| Opus 5 | $0.00034 | $0.01072 |
| Sonnet 5 | $0.00014 | $0.00429 |
| Haiku 4.5 | $0.00007 | $0.00214 |
Grade A, and why
lean4-theorem-proving 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 8d 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.
This is a copy
100% identical to lean4-theorem-proving — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lean 4 Theorem Proving
Core Principle
Build incrementally, structure before solving, trust the type checker. Lean's type checker is your test suite.
Success = lake build passes + zero sorries + zero custom axioms. Theorems with sorries/axioms are scaffolding, not results.
Quick Reference
| Resource | What You Get | Where to Find |
|---|---|---|
| Interactive Commands | 10 slash commands for search, analysis, optimization, repair | Type /lean in Claude Code (full guide) |
| Automation Scripts | 19 tools for search, verification, refactoring, repair | Plugin scripts/ directory (scripts/README.md) |
| Subagents | 4 specialized agents for batch tasks (optional) | subagent-workflows.md |
| LSP Server | 30x faster feedback with instant proof state (optional) | lean-lsp-server.md |
| Reference Files | 18 detailed guides (phrasebook, tactics, patterns, errors, repair, performance) | List below |
When to Use
Use for ANY Lean 4 development: pure/applied math, program verification, mathlib contributions.
Critical for: Type class synthesis errors, sorry/axiom management, mathlib search, measure theory/probability work.
Tools & Workflows
7 slash commands for search, analysis, and optimization - type /lean in Claude Code. See COMMANDS.md for full guide with examples and workflows.
16 automation scripts for search, verification, and refactoring. See scripts/README.md for complete documentation.
Lean LSP Server (optional) provides 30x faster feedback with instant proof state and parallel tactic testing. See lean-lsp-server.md for setup and workflows.
Subagent delegation (optional, Claude Code users) enables batch automation. See subagent-workflows.md for patterns.
What ships with it
20 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.
- references/axiom-elimination.md 5.9 KB
- references/calc-patterns.md 8.7 KB
- references/compilation-errors.md 20 KB
- references/compiler-guided-repair.md 18 KB
- references/domain-patterns.md 25 KB
- references/instance-pollution.md 16 KB
- references/lean-lsp-server.md 8.9 KB
- references/lean-lsp-tools-api.md 25 KB
- references/lean-phrasebook.md 17 KB
- references/mathlib-guide.md 14 KB
- references/mathlib-style.md 8.5 KB
- references/measure-theory.md 27 KB
- references/performance-optimization.md 16 KB
- references/proof-golfing-patterns.md 11 KB
- references/proof-golfing-safety.md 5.8 KB
- references/proof-golfing.md 3.6 KB
- references/proof-refactoring.md 28 KB
- references/sorry-filling.md 4.8 KB
- references/subagent-workflows.md 18 KB
- references/tactics-reference.md 16 KB
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.
- 8d ago First seen · 156 lines · 68 tokens per session scan A ccdf91ca8b6e
lean4-theorem-proving is a skill published in the GitHub repository xuansenpa1/skillrevise (56 stars, last pushed 6d ago), licensed MIT. It adds 68 tokens to every session and 2,144 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to lean4-theorem-proving, differing in 0 lines, and is treated as a copy.
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