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crash-course

crash-course is a skill for Claude Code, Codex from edlng/agents. It costs 87 tokens per session (1,260 once invoked), scanned A, original, no licence file.

A research workflow that turns a topic into a structured crash course and saves it in Obsidian, a note-taking application. It can optionally check the research before formatting the document.

In plain words
What is it for?
Use it to study a topic, produce a structured learning document, and store that document in an Obsidian vault.
Why use it?
It reduces the work of researching a subject, organizing the findings, and copying them into a consistent set of notes.

Skill for Claude CodeCodex

Written for Claude Code and Codex: disable-model-invocation in frontmatter, but also agents/openai.yaml present.

not rated 2repo changed 1mo ago A scan 87 tokens no licence

Good fit Use it to study a topic, produce a structured learning document, and store that document in an Obsidian vault.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/edlng/agents/crash-course
View source ↗ edlng/agents edlng.github.io
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 edlng/agents --skill crash-course
Clone the repo
git clone --depth 1 https://github.com/edlng/agents

Made for: Claude Code, Codex.

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 crash-course

README.md
[![agentmods](https://agentmods.dev/badge/skills/edlng/agents/crash-course/github.svg)](https://agentmods.dev/skills/edlng/agents/crash-course)
Your own site
<a href="https://agentmods.dev/skills/edlng/agents/crash-course"><img src="https://agentmods.dev/badge/skills/edlng/agents/crash-course/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 crash-course

Your own site · 80×15
<a href="https://agentmods.dev/skills/edlng/agents/crash-course"><img src="https://agentmods.dev/badge/skills/edlng/agents/crash-course.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 87 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,260 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 unknown 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 $0.00087 $0.01260
Opus 5.5 $0.00035 $0.00504
Sonnet 5.5 $0.00017 $0.00252
Haiku 4.5 $0.00009 $0.00126

Measured 1mo ago against content hash 4f379d601320, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

crash-course 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.

skills/universal/crash-course/SKILL.md · 129 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

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.

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 Changed · +5 lines 4f379d601320
  2. 1mo ago Changed · -3 lines · -3 tokens per session bdfc3cfdfc02
  3. 2mo ago First seen · 127 lines · 90 tokens per session scan A 3c6a44788ac6

Subscribe to this mod's changes

crash-course is a skill published in the GitHub repository edlng/agents (2 stars, last pushed 8d ago), with no licence file. It adds 87 tokens to every session and 1,260 once invoked, about $0.0003 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 2026-08-31.

Learning and teachingResearch
Related

crash-course compared with skills from other repositories

crash-course next to 6 skills from other repositories
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crash-courseedlng/agentsSkill28d agononeA87Claude Code, Codex
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book-mirrorgarrytan/gbrainSkill32ktodayMITA138Claude Code
exam-forecastanthropics/claude-for-legalSkill9.9ktodayApache-2.0A73Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleepSkill19kyesterdayMITA81Claude Code
eli5companion-inc/feynmanSkill10k6d agoMITA63Claude Code, Codex
deck-course-modulenexu-io/html-anythingSkill9.4ktodayApache-2.0A25Claude Code, Codex