Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add cameronfreer/lean4-skills/plugin install lean4Wrote 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/review)<a href="https://agentmods.dev/commands/cameronfreer/lean4-skills/review"><img src="https://agentmods.dev/badge/commands/cameronfreer/lean4-skills/review.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 5.1 | $0.00009 | $0.05443 |
| Opus 5 | $0.00005 | $0.02721 |
| Sonnet 5 | $0.00002 | $0.01089 |
| Haiku 4.5 | $0.00001 | $0.00544 |
Grade A, and why
review 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 2d 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 — 453 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lean4 Review
Read-only review of Lean proofs for quality, style, and optimization opportunities.
Non-destructive: Files are restored after analysis.
Usage
/lean4:review # Review changed files (default)
/lean4:review File.lean # Review specific file
/lean4:review File.lean --line=89 # Review single sorry
/lean4:review File.lean --line=89 --scope=deps # Review sorry + its dependencies
/lean4:review --scope=project # Review entire project (prompts)
/lean4:review --mathlib-review # Force the mathlib-review bar (Layer 2)
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. Emit
the final Resolved Inputs summary from the block values.
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 acting.
Startup requirements:
- Emit a Resolved Inputs block with explicit values, defaults, and any
ignored flags — including the effective Layer-2 activation decision and
its source (
flag,repository_kind,contributing_upstream, the helper's validatedintent.source, orhelper-failure; see Mathlib Review Layer). - Refuse to start on startup validation errors — including passing both
--mathlib-reviewand--no-mathlib-review(--mathlib-reviewwith--no-mathlib-review→ startup validation error).
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.
- 2d ago Changed edaa35290acc
- 6d ago First seen · 453 lines · 9 tokens per session scan A c5e6641a9fd2
review is a command published in the GitHub repository cameronfreer/lean4-skills (430 stars, last pushed today), licensed MIT. It adds 9 tokens to every session and 5,443 once invoked, about $0.0000 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.
Other commands, from other repositories
checklist
Generate a custom checklist for the current feature based on user requirements.
clarify
Identify underspecified areas in the current feature spec by asking up to 5 highly targeted clarification questions and encoding answers back into the spec.
specify
Create or update the feature specification from a natural language feature description.
analyze
Perform a non-destructive cross-artifact consistency and quality analysis across spec.md, plan.md, and tasks.md after task generation.
constitution
Create or update the project constitution from interactive or provided principle inputs.
converge
Assess the current codebase against the feature's spec, plan, and tasks, then append any remaining unbuilt work as new tasks to tasks.md so implement can complete it.