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/compare)<a href="https://agentmods.dev/skills/yarikleto/claude-teacher-plugin/compare"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/compare/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/compare"><img src="https://agentmods.dev/badge/skills/yarikleto/claude-teacher-plugin/compare.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 | $0.00036 | $0.01554 |
| Opus 5 | $0.00018 | $0.00777 |
| Sonnet 5 | $0.00007 | $0.00311 |
| Haiku 4.5 | $0.00004 | $0.00155 |
Grade A, and why
compare 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 — 145 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}.
Compare — Side-by-Side Concept Comparisons
Creates a structured, researched comparison of two concepts. Adapts depth and language to the student's level. Results are saved to both project-local and global education docs.
Invocation
/claude-teacher:compare <concept A> vs <concept B>
Examples:
/claude-teacher:compare TCP vs UDP/claude-teacher:compare REST vs GraphQL/claude-teacher:compare mutex vs semaphore/claude-teacher:compare Docker vs VMs/claude-teacher:compare SQL vs NoSQL
Process
- Parse the two concepts from the invocation (prefer
vsorversus; ask if the boundary is ambiguous instead of splitting names that containand) - Read
<education-db>/student.json— adapt to level, interests, and learning style - Read
<education-db>/dashboard.json— check if either concept is already tracked - If tracked, read
<education-db>/topics/<concept>.jsonfor each — check depth, misconceptions - Use WebSearch to research BOTH concepts before writing the comparison — never rely solely on training data. Search for official documentation, authoritative articles, and recent best-practice guides for each concept.
- Generate the structured comparison (see Output Format below)
- Save comparison to docs and update DB (see DB Update below)
Output Format
Present the comparison in this exact structure:
── Compare: [Concept A] vs [Concept B] ──────────────────
## What they are
**[Concept A]:** [One-line summary]
**[Concept B]:** [One-line summary]
## Side-by-side comparison
| Feature | [Concept A] | [Concept B] |
|--------------------|-------------------|-------------------|
| [Feature 1] | [Value/behavior] | [Value/behavior] |
| [Feature 2] | [Value/behavior] | [Value/behavior] |
| [Feature 3] | [Value/behavior] | [Value/behavior] |
| ... | ... | ... |
Include 5-8 rows covering the most important differentiators.
Adapt column detail to student level (beginner = simpler terms, advanced = precise technical language).
## When to use which
**Choose [Concept A] when:**
- [Concrete scenario 1]
- [Concrete scenario 2]
- [Concrete scenario 3]
**Choose [Concept B] when:**
- [Concrete scenario 1]
- [Concrete scenario 2]
- [Concrete scenario 3]
## Common misconceptions
- **Misconception:** "[common wrong belief]"
**Reality:** [correction with explanation]
- **Misconception:** "[another common wrong belief]"
**Reality:** [correction with explanation]
Include 2-4 misconceptions. If the student has recorded misconceptions about either topic, address those FIRST.
## Key takeaway
> [One memorable sentence that captures the essential difference]
**Sources:** [list 2-4 links to official docs, RFCs, or authoritative articles used]
──────────────────────────────────────────────────────────
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 1122ef810728
- 10d ago First seen · 141 lines · 36 tokens per session scan A f439048cc47b
compare is a skill published in the GitHub repository yarikleto/claude-teacher-plugin (8 stars, last pushed 3d ago), licensed MIT. It adds 36 tokens to every session and 1,554 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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