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.
git clone --depth 1 https://github.com/cameronfreer/lean4-skillsWrote 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/commands/cameronfreer/lean4-skills/learn)<a href="https://agentmods.dev/commands/cameronfreer/lean4-skills/learn"><img src="https://agentmods.dev/badge/commands/cameronfreer/lean4-skills/learn/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/commands/cameronfreer/lean4-skills/learn"><img src="https://agentmods.dev/badge/commands/cameronfreer/lean4-skills/learn.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 | $0.00008 | $0.04090 |
| Opus 5.5 | $0.00003 | $0.01636 |
| Sonnet 5.5 | $0.00002 | $0.00818 |
| Haiku 4.5 | $0.00001 | $0.00409 |
Grade A, and why
learn 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 1mo 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 — 206 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lean4 Learn
Interactive teaching and mathlib exploration. Adapts to beginner, intermediate, and expert audiences.
Usage
/lean4:learn # Start conversational discovery
/lean4:learn Finset.sum # Auto-detect mode from topic
/lean4:learn --mode=repo # Explore current project
/lean4:learn --mode=mathlib topology # Navigate mathlib for a topic
/lean4:learn --style=socratic --interactive # True Socratic method
/lean4:learn --style=game --track=nng-like # Game-style natural numbers track
/lean4:learn --source ./paper.pdf # Learn from a paper/PDF
/lean4:learn --presentation=informal "Bolzano-Weierstrass" # Prose, Lean-backed
/lean4:learn --output=scratch # Write results to scratch file
/lean4:learn --style=socratic --adaptive=off # Socratic, no style/level drift
Invocation Contract
Interpret this command's inputs per the Command Invocation Contract.
Primary path (hook-validated): If a validated-invocation block for this
command appears in context, treat it as the authoritative interpretation of
parser-decidable inputs and do not re-parse the raw invocation text for
those inputs. Start by reading all parser-decided fields from the block. Then,
if this command has repo-dependent startup rules (the --mode=mathlib scope
coercion depends on local-declaration resolution), apply them using runtime
context (LSP, grep). Emit the final Resolved Inputs summary from the
combined result.
See Validated Invocation Block.
Fallback path (other hosts): If no validated-invocation block is present,
parse the raw invocation text against this command's input table before
discovery.
Startup requirements:
- Emit a Resolved Inputs block with explicit values, defaults, coercions, ignored flags, and startup validation errors.
- Refuse to start on startup validation errors.
- Validate output paths and overwrite policy before writing anything.
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.
- 1mo ago First seen · 206 lines · 8 tokens per session scan A ad2cff2e6f26
learn is a command published in the GitHub repository cameronfreer/lean4-skills (465 stars, last pushed 19d ago), licensed MIT. It adds 8 tokens to every session and 4,090 once invoked, about $0.0000 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 2026-08-30.
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