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/draft)<a href="https://agentmods.dev/commands/cameronfreer/lean4-skills/draft"><img src="https://agentmods.dev/badge/commands/cameronfreer/lean4-skills/draft/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/draft"><img src="https://agentmods.dev/badge/commands/cameronfreer/lean4-skills/draft.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 | $0.00010 | $0.03439 |
| Opus 5.5 | $0.00004 | $0.01376 |
| Sonnet 5.5 | $0.00002 | $0.00688 |
| Haiku 4.5 | $0.00001 | $0.00344 |
Grade A, and why
draft 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 — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Lean4 Draft
Draft Lean 4 declaration skeletons from informal mathematical claims. Produces sorry-stubbed statements ready for /lean4:prove or /lean4:autoprove.
Usage
/lean4:draft "Every continuous function on a compact set is bounded"
/lean4:draft --mode=attempt "Zorn's lemma implies AC"
/lean4:draft --source ./paper.pdf # Ingest, pick claims, draft skeletons
/lean4:draft --source ./paper.pdf "Theorem 3.2" # Source as context, topic as claim
/lean4:draft --output=file --out=MyTheorem.lean "..."
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
claim acquisition.
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.
Inputs
| Arg | Required | Default | Description |
|---|---|---|---|
| topic | no | — | Informal claim to draft. Optional when --source provides it (source-led flow). At least one of topic or --source must be given; omitting both is a startup validation error. |
| --mode | no | skeleton |
skeleton | attempt. skeleton produces sorry-stubbed declarations only. attempt adds a proof-attempt loop (lean_multi_attempt) before finalizing. |
| --elab-check | no | best-effort |
best-effort | strict. Elaboration check strictness for drafted skeletons. |
| --level | no | intermediate |
beginner | intermediate | expert |
| --output | no | chat |
chat | scratch | file |
| --out | no | — | Output path. Required when --output=file; startup validation error if missing. |
| --overwrite | no | false |
Allow overwriting existing files with --output=file. Without flag, existing target → startup validation error. |
| --mathlib-template | no | false |
Emit the mathlib module-system file header on --output=file writes regardless of detected project context. Requires --output=file; mutually exclusive with --no-mathlib-template. |
| --no-mathlib-template | no | false |
Never emit the mathlib module-system file header on --output=file writes, regardless of detected project context. Requires --output=file; mutually exclusive with --mathlib-template. |
| --source | no | — | File path, URL, or PDF to seed drafting. See learn-pathways.md. |
| --intent | no | math |
auto | usage | math. See learn-pathways.md. |
| --presentation | no | auto |
informal | supporting | formal | auto. Controls user-facing display, not Lean backing. See learn-pathways.md. |
| --claim-select | no | — | first | named:"..." | regex:"...". Noninteractive claim selection from --source. See below. |
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 · 166 lines · 10 tokens per session scan A 9055456f569e
draft is a command published in the GitHub repository cameronfreer/lean4-skills (465 stars, last pushed 19d ago), licensed MIT. It adds 10 tokens to every session and 3,439 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.
Other commands, from other repositories
draft
Draft Lean declaration skeletons from informal claims.
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.
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.