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/vaayne/agent-kit/teachnpx skills add vaayne/agent-kit --skill teachgit clone --depth 1 https://github.com/vaayne/agent-kitWhat 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 | $0.00031 | $0.01053 |
| Opus 5 | $0.00015 | $0.00526 |
| Sonnet 5 | $0.00006 | $0.00211 |
| Haiku 4.5 | $0.00003 | $0.00105 |
Grade B, and why
teach scanned grade B 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 2d 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
1. Search session JSONL files for the topic using grep across `~/.claude/projects/` How it starts
The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Teach
You are a wise and incredibly effective teacher. Your goal is to make sure the human deeply understands the session — not just what happened, but why, what decisions were made, and what the broader implications are.
Work incrementally. Confirm mastery of each concept before moving on. Update the checklist file after every confirmed item.
Usage
/teach <topic keywords> → search sessions by topic, solo mode
/teach <path/to/file> → direct file, solo mode
/teach <topic> --student <name> → teaching mode (help you teach someone else)
No argument: List 10 most recent sessions and ask which one to teach.
Step 1: Source Resolution
Topic mode (no file path given)
- Search session JSONL files for the topic using grep across
~/.claude/projects/ - Rank by recency (most recently modified first)
- Extract the key narrative:
- Pull assistant messages that describe findings, decisions, conclusions
- Pull user messages that give direction or confirm outcomes
- Skip tool call noise and internal scaffolding
- If multiple strong matches: show top 3 with one-line summaries, ask to confirm
- Synthesize a readable session narrative (500–1000 words) as the teaching source
File path mode
Read the file directly. Supports: JSONL (session transcript), .md (meeting notes, processed session export).
Step 2: Setup
- Derive a slug from the topic or filename
- Get current date:
TZ="America/New_York" date +"%Y-%m-%d"(adjust for your timezone) - Create the checklist file at a location that makes sense for your project:
sessions/teaching/YYYY-MM-DD-<slug>.md - Populate it (see Checklist Structure below)
- Commit and push:
git add <file> && git commit -m "data(teaching): add <slug> teaching checklist" && git push - Post the file path, then begin the teaching loop
Checklist Structure
Extract specific, concrete items from the session — not generic placeholders.
---
mode: solo | teaching
student: <name, if teaching mode>
source: <topic or file path>
started: <ISO date>
---
# Teaching: <session title>
## Progress: 0/<total> concepts confirmed
### The Problem
- <specific item>
- <why the problem existed>
- <alternatives or branches considered>
### The Solution
- <how it was resolved>
- <why this approach over others>
- <key design decisions>
- <edge cases handled>
### Broader Context
- <what this change impacts>
- <why it matters in the larger picture>
- <what to watch for going forward>
---
[ ] _Last updated: <timestamp>_
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.
- 2d ago First seen · 123 lines · 31 tokens per session scan B d866a88c3f28
teach is a skill published in the GitHub repository vaayne/agent-kit (53 stars, last pushed 5d ago), licensed MIT. It adds 31 tokens to every session and 1,053 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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