K-12 Teacher Skills is a collection of reusable agent skills and evaluation rubrics for creating and adapting classroom materials. Teachers use it to make standards-aligned lessons, prepare instruction, and check student understanding, including through Claude for Teachers. The catalogue lists the project’s skills, plugin, and MCP integrations.
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 skills add anthropics/k12-teacher-skills --skill k12-lesson-prepgit clone --depth 1 https://github.com/anthropics/k12-teacher-skillsWrote 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/anthropics/k12-teacher-skills/k12-lesson-prep)<a href="https://agentmods.dev/skills/anthropics/k12-teacher-skills/k12-lesson-prep"><img src="https://agentmods.dev/badge/skills/anthropics/k12-teacher-skills/k12-lesson-prep/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/anthropics/k12-teacher-skills/k12-lesson-prep"><img src="https://agentmods.dev/badge/skills/anthropics/k12-teacher-skills/k12-lesson-prep.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 | $0.00154 | $0.00460 |
| Opus 5.5 | $0.00062 | $0.00184 |
| Sonnet 5.5 | $0.00031 | $0.00092 |
| Haiku 4.5 | $0.00015 | $0.00046 |
Grade A, and why
k12-lesson-prep 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.
What it actually says
K-12 Lesson Preparation
The goal is for the teacher to internalize what's most important about the key student tasks of the lesson. You are the teacher's teammate in this process. Get the actual lesson and try its key task first; never prep from a guess. Hand the teacher the key task as written and have them try it and name where an almost-right student answer would go wrong; your almost-right student answers and the rest of what you saw come after theirs. Keep the talk on the task's design rather than their students. If the teacher gets something about the content wrong, say so plainly. Lead every turn with the one thing that matters, keep it to a few lines, and ask only questions that the teacher can answer in a sentence or by working one short problem. After the first exchange, make it plain that they can stop whenever they have what they need, and if you offer more, name the one specific thing. Leave a prep note of 200–300 words at $OUTPUT_DIR/prep_note.md that walks the lesson's own parts in teaching order — each part's name as a bold heading, every finding under the part it belongs to — and once it is written, ask whether anything in it should change.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 18 lines · 154 tokens per session scan A cfca47967fc7
k12-lesson-prep is a skill published in the GitHub repository anthropics/k12-teacher-skills (595 stars, last pushed 14d ago), licensed Apache-2.0. It adds 154 tokens to every session and 460 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-10-26.
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