Borrowing it
Nothing to install: this file belongs to tobiasosborne/alethfeld. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tobiasosborne/alethfeld/legacy/.claude/commands/edn-to-lean.mdgit clone --depth 1 https://github.com/tobiasosborne/alethfeldWrote 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/tobiasosborne/alethfeld/edn-to-lean)<a href="https://agentmods.dev/commands/tobiasosborne/alethfeld/edn-to-lean"><img src="https://agentmods.dev/badge/commands/tobiasosborne/alethfeld/edn-to-lean/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/tobiasosborne/alethfeld/edn-to-lean"><img src="https://agentmods.dev/badge/commands/tobiasosborne/alethfeld/edn-to-lean.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 | $0.00588 |
| Opus 5 | $0.00005 | $0.00294 |
| Sonnet 5 | $0.00002 | $0.00118 |
| Haiku 4.5 | $0.00001 | $0.00059 |
Grade A, and why
edn-to-lean 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 12d 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.
What it actually says
EDN to Lean 4 Conversion
Convert an Alethfeld EDN proof to a Lean 4 formalization.
Input
User provides path to an EDN proof file.
Process
1. Parse EDN Structure
Read the EDN file and extract:
:theorem- the main claim:symbols- type declarations:assumptions- hypotheses:steps- proof structure:qed- final conclusion
2. Map to Lean Types
| EDN Type | Lean Type |
|---|---|
ℝ |
Real or ℝ |
ℕ |
Nat or ℕ |
X → Y |
X → Y |
Matrix m n R |
Matrix (Fin m) (Fin n) R |
Operator H |
H →L[ℂ] H |
3. Generate Lean Structure
import Mathlib
-- imports based on types used
namespace <ProofName>
-- Definitions from :definitions
def ... := ...
-- Main theorem from :theorem
theorem main_theorem
(assumptions from :assumptions) :
<theorem statement> := by
-- tactics derived from :steps
sorry -- initially, then fill in
4. Map Proof Steps to Tactics
| EDN Justification | Lean Tactic |
|---|---|
:definition-expansion |
unfold, simp only [def] |
:substitution |
rw, conv |
:modus-ponens |
apply, exact |
:algebraic-rewrite |
ring, field_simp |
:case-split |
cases, rcases, by_cases |
:induction-step |
induction |
:contradiction |
by_contra, absurd |
:admitted |
sorry |
5. Output
Create the Lean file at lean/AlethfeldLean/<appropriate-path>.lean
Include:
- Module docstring with theorem statement
- All necessary imports
- Type signatures matching EDN symbols
- Proof skeleton with
sorrywhere needed - Comments linking to EDN step IDs
6. Verify
cd lean && lake build <module-path>
Report any type errors and fix them before finishing.
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.
- 12d ago First seen · 85 lines · 10 tokens per session scan A bc58d6fd2245
edn-to-lean is a command published in the GitHub repository tobiasosborne/alethfeld (144 stars, last pushed 3mo ago), licensed MIT. It adds 10 tokens to every session and 588 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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