learn

learn is a skill for Claude Code from saadshahd/moo.md. It costs 34 tokens per session (270 once invoked), scanned A, original, MIT.

A learning skill that works out what a person needs to understand, then routes them to an explanation, an example, or a way to present the idea. It ends by checking whether the person can explain or use it.

In plain words
What is it for?
Use it to teach a concept, demonstrate how something behaves, or help someone prepare a clear explanation and confirm what they understood.
Why use it?
It avoids giving a generic lesson when the real gap might be practical behavior, deep understanding, or explaining one point to others.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the hold plugin — 4 skills shipped together

Good fit Use it to teach a concept, demonstrate how something behaves, or help someone prepare a clear explanation and confirm what they understood.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/saadshahd/moo.md/learn
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.

Any agent
npx skills add saadshahd/moo.md --skill learn
Clone the repo
git clone --depth 1 https://github.com/saadshahd/moo.md

Made for: Claude Code.

Or install hold, the plugin that ships this one along with the rest of its 4 skills.

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 learn

README.md
[![agentmods](https://agentmods.dev/badge/skills/saadshahd/moo.md/learn/github.svg)](https://agentmods.dev/skills/saadshahd/moo.md/learn)
Your own site
<a href="https://agentmods.dev/skills/saadshahd/moo.md/learn"><img src="https://agentmods.dev/badge/skills/saadshahd/moo.md/learn/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.

agentmods 80×15 button for learn

Your own site · 80×15
<a href="https://agentmods.dev/skills/saadshahd/moo.md/learn"><img src="https://agentmods.dev/badge/skills/saadshahd/moo.md/learn.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 270 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 $0.00034 $0.00270
Opus 5.5 $0.00014 $0.00108
Sonnet 5.5 $0.00007 $0.00054
Haiku 4.5 $0.00003 $0.00027

Measured 1mo ago against content hash 97dc372ca756, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

learn 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 1mo 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.

hold/skills/learn/SKILL.md · 22 lines

What it actually says

Identify who must hold it, what they lack; clarify with the user what the conversation lacks.

Route by what they lack, invoking the named skill with the Skill tool:

  • Something they must understand deeply and be quizzed on → use grasp skill.
  • How something behaves, and reading has not made it intuitive → use toy skill.
  • One thing an audience — the user counts — must keep → use land skill.

Route again while a move's gate shows something else lacked. Run no move nothing lacked calls for.

End on one line, with what stays open:

  • Held — the reader said it back in their own words, or passed the move's gate. Never from silence, a half-done gate, or an opened artifact.
  • Not yet — the gate showed what they still lack; name it and re-run the move on it. The user stopping before held is not yet, said so.

Nothing built yet → deciding comes first, not hold's. One view or one plain line would make the point, or the artifact is the product → not hold's. Say which and stop.

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. 1mo ago First seen · 22 lines · 34 tokens per session scan A 97dc372ca756

Subscribe to this mod's changes

learn is a skill published in the GitHub repository saadshahd/moo.md (38 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 270 once invoked, about $0.0001 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 2026-09-07.

Related

Other skills, from other repositories

session-recap

Document Claude Code sessions by extracting knowledge into cross-referenced documentation. Triggers on "recap the session", "summarize the work", or after significant code changes.

sxhmilyoyo/sundayhao-plugins · 39 tokens

knowledge-bank-lookup

Delegates knowledge bank lookups to Explore subagents with reflections-first strategy that learns from past mistakes. Checks /reflections/ directory before documentation to extract documented failures to avoid and proven approaches to apply. Automatically triggers when user mentions services ([project-a], [project-b]…

sxhmilyoyo/sundayhao-plugins · 94 tokens

kb-ingest

Ingest external sources into the knowledge bank through interactive study or quick filing. Two modes — Quick (summarize → file) and Study (theme-by-theme deep dive with online research and personal notes → multi-layer KB output → optional blog/slack synthesis). Triggers on "ingest this", "study this article", "add to…

sxhmilyoyo/sundayhao-plugins · 152 tokens

kb-lint

Health-check the knowledge bank for orphan documents, stale content, broken WikiLinks, index drift, and missing frontmatter. Generates a severity-graded report. Use this skill whenever the user mentions lint, health check, KB maintenance, stale docs, broken links, orphan pages, missing references, knowledge bank…

sxhmilyoyo/sundayhao-plugins · 103 tokens

session-manager

Set the current session's name, project, tags, or summary on its session note. Use when the user names, tags, or summarizes this session, sets its project, or mentions in passing what this session has been about.

sxhmilyoyo/sundayhao-plugins · 49 tokens

lark-openapi-explorer

A skill for finding and calling Lark APIs that are not already available through existing commands. An API is a defined way for software to request work from another service.

DropFan/claude-code-plugins · 76 tokens