Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add yarikleto/claude-teacher-plugin/plugin install claude-teacherWrote 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/yarikleto/claude-teacher-plugin/challenge)<a href="https://agentmods.dev/skills/yarikleto/claude-teacher-plugin/challenge"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/challenge/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/skills/yarikleto/claude-teacher-plugin/challenge"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/challenge.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 | $0.00042 | $0.01436 |
| Opus 5 | $0.00021 | $0.00718 |
| Sonnet 5 | $0.00008 | $0.00287 |
| Haiku 4.5 | $0.00004 | $0.00144 |
Grade A, and why
challenge 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 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.
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 — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Requested topic/task: $ARGUMENTS
Before accessing education data, read ${CLAUDE_PLUGIN_ROOT}/references/education-data.md. Resolve every <education-db> below using that contract. Current session ID: ${CLAUDE_SESSION_ID}.
Challenge — Mini-Tasks
Generates a short, focused exercise on the current topic. Adapts to the learning type. Results update the global education DB.
Invocation
/claude-teacher:challenge — picks topic from current context, weak areas, or topics at surface depth that need to reach working
/claude-teacher:challenge [topic] — specific topic
Process
- Read
<education-db>/dashboard.json— check topic statuses - Read
<education-db>/student.json— adapt to learning style and level - If a topic was given, read
<education-db>/topics/<topic>.json— check depth, misconceptions - If no topic given, pick using priority: topics at
surfacedepth (need hands-on to reachworking) →weaktopics →learnedtopics - NEVER generate challenges on topics not in the DB — the student hasn't learned them yet. If no covered topics exist: "Nothing to challenge on yet — let's learn something first!"
- Read
.claude/claude-teacher.jsonfor learning type (project,subject,exam-prep, ormixed); use CLAUDE.md only as a legacy fallback - If topic has unresolved misconceptions, design the challenge to expose/address them
- Generate ONE challenge appropriate to the type
- Wait for the student's answer
- Evaluate, explain, update DB
Challenge Types by Learning Type
Project (code challenges)
CHALLENGE: Write a function that...
Difficulty: [easy / medium / hard]
Time: ~5-10 minutes
Targeting: [depth promotion / misconception / reinforcement]
Hint available: yes (ask if stuck)
[Clear problem statement]
[Expected input/output if applicable]
Subject / mixed (scenario challenges)
CHALLENGE: You are designing...
Difficulty: [easy / medium / hard]
Time: ~5 minutes
Targeting: [depth promotion / misconception / reinforcement]
[Real-world scenario description]
[Question: what would you do / choose / configure?]
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 Changed · +4 lines 756a6d073cc7
- 9d ago First seen · 138 lines · 42 tokens per session scan A f28b3961bd8f
challenge is a skill published in the GitHub repository yarikleto/claude-teacher-plugin (8 stars, last pushed 3d ago), licensed MIT. It adds 42 tokens to every session and 1,436 once invoked, about $0.0002 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 2026-08-31.
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