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 skills/jerrylalala/compound-engineering/proofnpx skills add Jerrylalala/compound-engineering --skill proofgit clone --depth 1 https://github.com/Jerrylalala/compound-engineeringWrote 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/skills/jerrylalala/compound-engineering/proof)<a href="https://agentmods.dev/skills/jerrylalala/compound-engineering/proof"><img src="https://agentmods.dev/badge/skills/jerrylalala/compound-engineering/proof.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 | $0.00064 | $0.01824 |
| Opus 5 | $0.00032 | $0.00912 |
| Sonnet 5 | $0.00013 | $0.00365 |
| Haiku 4.5 | $0.00006 | $0.00182 |
Grade A, and why
proof scanned grade A with 1 finding 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 yesterday.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X POST https://www.proofeditor.ai/share/markdown \ This is a copy
100% identical to proof — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 186 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Proof - Collaborative Markdown Editor
Proof is a collaborative document editor for humans and agents. It supports two modes:
- Web API - Create and edit shared documents via HTTP (no install needed)
- Local Bridge - Drive the macOS Proof app via localhost:9847
Web API (Primary for Sharing)
Create a Shared Document
No authentication required. Returns a shareable URL with access token.
curl -X POST https://www.proofeditor.ai/share/markdown \
-H "Content-Type: application/json" \
-d '{"title":"My Doc","markdown":"# Hello\n\nContent here."}'
Response format:
{
"slug": "abc123",
"tokenUrl": "https://www.proofeditor.ai/d/abc123?token=xxx",
"accessToken": "xxx",
"ownerSecret": "yyy",
"_links": {
"state": "https://www.proofeditor.ai/api/agent/abc123/state",
"ops": "https://www.proofeditor.ai/api/agent/abc123/ops"
}
}
Use the tokenUrl as the shareable link. The _links give you the exact API paths.
Read a Shared Document
curl -s "https://www.proofeditor.ai/api/agent/{slug}/state" \
-H "x-share-token: <token>"
Edit a Shared Document
All operations go to POST https://www.proofeditor.ai/api/agent/{slug}/ops
Note: Use the /api/agent/{slug}/ops path (from _links in create response), NOT /api/documents/{slug}/ops.
Authentication for protected docs:
- Header:
x-share-token: <token>orAuthorization: Bearer <token> - Token comes from the URL parameter:
?token=xxxor theaccessTokenfrom create response
Comment on text:
{"op": "comment.add", "quote": "text to comment on", "by": "ai:<agent-name>", "text": "Your comment here"}
Reply to a comment:
{"op": "comment.reply", "markId": "<id>", "by": "ai:<agent-name>", "text": "Reply text"}
Resolve a comment:
{"op": "comment.resolve", "markId": "<id>", "by": "ai:<agent-name>"}
Suggest a replacement:
{"op": "suggestion.add", "kind": "replace", "quote": "original text", "by": "ai:<agent-name>", "content": "replacement text"}
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.
- yesterday First seen · 186 lines · 64 tokens per session scan A f673b6551982
proof is a skill published in the GitHub repository Jerrylalala/compound-engineering (5 stars, last pushed 3mo ago), licensed MIT. It adds 64 tokens to every session and 1,824 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to proof, differing in 0 lines, and is treated as a copy.
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