LESSONS

LESSONS is an agent for Claude Code from ondrej-merkun/skill-audit. It costs 0 tokens per session (5,986 once invoked), scanned B, original, no licence file.

A required session file containing numbered lessons for Ralph and human contributors. It records short notes about surprises, near-misses, and improvements for future work.

In plain words
What is it for?
Reading guidance at the start of a session and adding concise lessons when completed work reveals something worth remembering.
Why use it?
It gives contributors a shared place to review past mistakes and capture lessons instead of repeating them.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Install

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.

agentmods
npx agentmods add agents/ondrej-merkun/skill-audit/lessons
Clone the repo
git clone --depth 1 https://github.com/ondrej-merkun/skill-audit

Made for: Claude Code.

Wrote 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.

agentmods badge for LESSONS

README.md
[![agentmods](https://agentmods.dev/badge/agents/ondrej-merkun/skill-audit/lessons.svg)](https://agentmods.dev/agents/ondrej-merkun/skill-audit/lessons)
Your own site
<a href="https://agentmods.dev/agents/ondrej-merkun/skill-audit/lessons"><img src="https://agentmods.dev/badge/agents/ondrej-merkun/skill-audit/lessons.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 5,986 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.05986
Opus 5 $0.00000 $0.02993
Sonnet 5 $0.00000 $0.01197
Haiku 4.5 $0.00000 $0.00599

Measured 6d ago against content hash 12e787d98ff0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade B, and why

LESSONS scanned grade B with 2 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 6d 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.

Unrestricted tool accessmediumExcessive agency

A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.

Run any command you document for regenerating shipped data before committing

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

smoke test first reported timeouts because `spawnSync` blocked the same Node
docs/agents/LESSONS.md · 440 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

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.

  1. 6d ago First seen · 440 lines · 0 tokens per session scan B 12e787d98ff0

Subscribe to this mod's changes

LESSONS is an agent published in the GitHub repository ondrej-merkun/skill-audit (3 stars, last pushed 1mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 5,986 tokens. A static security scan graded it B with 2 findings (unrestricted tool access, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.