search

search is a skill for Claude Code from project-numina/numina-lean-agent. It costs 19 tokens per session (226 once invoked), scanned A, original, no licence file.

A set of search tools for finding theorems, lemmas, and definitions in Mathlib, the standard library of reusable Lean mathematics. Lean is a language for computer-checked mathematical proofs.

In plain words
What is it for?
Use it to search Mathlib for relevant theorems, lemmas, and definitions while writing Lean proofs.
Why use it?
Finding an existing result can be difficult when Mathlib contains many related definitions and proofs. Search helps locate material that may fit a proof.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the skills plugin — 6 skills 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/project-numina/numina-lean-agent/search
Any agent
npx skills add project-numina/numina-lean-agent --skill search
Clone the repo
git clone --depth 1 https://github.com/project-numina/numina-lean-agent

Made for: Claude Code.

Or install skills, the plugin that ships this one along with the rest of its 6 skills.

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 search

README.md
[![agentmods](https://agentmods.dev/badge/skills/project-numina/numina-lean-agent/search.svg)](https://agentmods.dev/skills/project-numina/numina-lean-agent/search)
Your own site
<a href="https://agentmods.dev/skills/project-numina/numina-lean-agent/search"><img src="https://agentmods.dev/badge/skills/project-numina/numina-lean-agent/search.svg" alt="Measured on agentmods" height="20"></a>
Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 226 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 5.1 $0.00019 $0.00226
Opus 5 $0.00010 $0.00113
Sonnet 5 $0.00004 $0.00045
Haiku 4.5 $0.00002 $0.00023

Measured 6d ago against content hash f651ac87947f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

search 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 6d 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/search/SKILL.md · 22 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

Files

What ships with it

6 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.

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. 6d ago First seen · 22 lines · 19 tokens per session scan A f651ac87947f

Subscribe to this mod's changes

search is a skill published in the GitHub repository project-numina/numina-lean-agent (271 stars, last pushed 1mo ago), with no licence file. It adds 19 tokens to every session and 226 once invoked, about $0.0001 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.

Related

Other skills, from other repositories