beat-sheet

beat-sheet is a skill for Claude Code, Codex from jl-cmd/claude-dev-env. It costs 66 tokens per session (504 once invoked), scanned A, original, MIT.

A response format made of short, single-line points written in everyday language.

In plain words
What is it for?
Use it to rewrite an explanation into a small set of ordered points covering the situation, problem, fix, and how it works.
Why use it?
It makes long or jargon-heavy explanations easier to skim and understand.

Skill for Claude CodeCodex

Part of the claude-dev-env plugin — 45 skills, 9 agents, 1 hook shipped together

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.

agentmods
npx agentmods add skills/jl-cmd/claude-dev-env/beat-sheet
Any agent
npx skills add jl-cmd/claude-dev-env --skill beat-sheet
Clone the repo
git clone --depth 1 https://github.com/jl-cmd/claude-dev-env

Made for: Claude Code, Codex.

Or install claude-dev-env, the plugin that ships this one along with the rest of its 45 skills, 9 agents, 1 hook.

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 beat-sheet

README.md
[![agentmods](https://agentmods.dev/badge/skills/jl-cmd/claude-dev-env/beat-sheet.svg)](https://agentmods.dev/skills/jl-cmd/claude-dev-env/beat-sheet)
Your own site
<a href="https://agentmods.dev/skills/jl-cmd/claude-dev-env/beat-sheet"><img src="https://agentmods.dev/badge/skills/jl-cmd/claude-dev-env/beat-sheet.svg" alt="Measured on agentmods" height="20"></a>
Per session 66 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 504 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00066 $0.00504
Opus 5 $0.00033 $0.00252
Sonnet 5 $0.00013 $0.00101
Haiku 4.5 $0.00007 $0.00050

Measured 4d ago against content hash e12d2e2e74e6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

beat-sheet 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 4d 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.

packages/claude-dev-env/.agents/skills-archived/beat-sheet/SKILL.md · 55 lines

What it actually says

beat-sheet

Write in single-line beats. Make each line one complete thought, under 12 words, with a blank line between lines. Keep it to ten lines, each one covering a new point. Order: situation, problem, fix, how it works. Put any command in its own code fence. Start with one short bold title line. Use plain everyday words a tired reader can skim.

Plain words

Name the real thing first — a file, an image, a control, a screen, a size, an id, a proof. Prefer a word the reader can point at over an abstract one. When a word only makes sense on this project, say what it is in the app or on disk (a Theme Studio control, a package file name).

What the reader gets

Lead with the answer. Put most of the reply on what they asked; keep warnings short. For "what's wrong" or "what's missing", answer in this order: what's wrong, what's missing, what follows. For an explain request, give a short summary unless they ask for more.

Around the work

Before the first tool call, say in one sentence what you'll do. While working, speak up only on an important find or a change of course. When you finish, open with the result — what happened or what you found — then add detail only if it helps.

Job size

Do the job asked, at the size asked. Decide small things yourself; ask only when two readings would change the work. When the ask looks off or a better path is clear, say so in one sentence, then do what was asked. Finish the whole job.

Before sending

Read the reply as someone new to the project. Replace any word that needs a glossary with the thing itself.

Visual beats

Add a visual only when it earns its space beyond what the beats already show on their own. See reference/visual-beats.md for the shape picker, the rich setup, and a working example.

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. 4d ago First seen · 55 lines · 66 tokens per session scan A e12d2e2e74e6

Subscribe to this mod's changes

beat-sheet is a skill published in the GitHub repository jl-cmd/claude-dev-env (5 stars, last pushed today), licensed MIT. It adds 66 tokens to every session and 504 once invoked, about $0.0003 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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