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 agentmods add commands/cameronfreer/lean4-skills/draftgit clone --depth 1 https://github.com/cameronfreer/lean4-skillsWhat 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 | $0.00010 | $0.03439 |
| Opus 5 | $0.00005 | $0.01720 |
| Sonnet 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 3d 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.
- 3d ago First seen · 166 lines · 10 tokens per session scan A 9055456f569e
draft is a command published in the GitHub repository cameronfreer/lean4-skills (418 stars, last pushed 7d ago), licensed MIT. It adds 10 tokens to every session and 3,439 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.
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