agent-skill-builder

agent-skill-builder is a skill for Claude Code, Codex from dimonier/skills. It costs 76 tokens per session (2,564 once invoked), scanned A, original, no licence file.

Guidance for creating and reviewing coding-agent skills, which are reusable instructions for handling specific kinds of work. It also explains when another option, such as project rules or an external tool, is a better fit.

In plain words
What is it for?
Use it when designing a new skill, choosing between skills and other agent configuration options, or reviewing an existing skill for quality.
Why use it?
It helps avoid creating unnecessary, confusing, or poorly scoped instructions for an agent.

Skill for Claude CodeCodex

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/dimonier/skills/create-agent-skill
Any agent
npx skills add dimonier/skills --skill create-agent-skill
Clone the repo
git clone --depth 1 https://github.com/dimonier/skills

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 agent-skill-builder

README.md
[![agentmods](https://agentmods.dev/badge/skills/dimonier/skills/create-agent-skill.svg)](https://agentmods.dev/skills/dimonier/skills/create-agent-skill)
Your own site
<a href="https://agentmods.dev/skills/dimonier/skills/create-agent-skill"><img src="https://agentmods.dev/badge/skills/dimonier/skills/create-agent-skill.svg" alt="Measured on agentmods" height="20"></a>
Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,564 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00076 $0.02564
Opus 5 $0.00038 $0.01282
Sonnet 5 $0.00015 $0.00513
Haiku 4.5 $0.00008 $0.00256

Measured 4d ago against content hash e0b23e7c0d23, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

agent-skill-builder 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.

skills/create-agent-skill/SKILL.md · 274 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. 4d ago First seen · 274 lines · 76 tokens per session scan A e0b23e7c0d23

Subscribe to this mod's changes

agent-skill-builder is a skill published in the GitHub repository dimonier/skills (6 stars, last pushed today), with no licence file. It adds 76 tokens to every session and 2,564 once invoked, about $0.0004 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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