author-or-update-agent-skill

author-or-update-agent-skill is a skill for Claude Code from eugenelim/agent-ready-repo. It costs 154 tokens per session (1,418 once invoked), scanned A, original, Apache-2.0.

An agent skill for designing or editing other agent skills, including their activation rules and SKILL.md files. It defines what the skill should do, when it should run, and what authority it has.

In plain words
What is it for?
Use it to plan, author, or update a coding-agent skill and its trigger or workflow rules.
Why use it?
It helps create skills with clear boundaries and portable instructions, while separating planning from permission to make changes.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents; mentions AGENTS.md.

Part of the agent-skill-engineering plugin — 7 skills shipped together

Good fit Use it to plan, author, or update a coding-agent skill and its trigger or workflow rules.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/eugenelim/agent-ready-repo/author-or-update-agent-skill
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 eugenelim/agent-ready-repo --skill author-or-update-agent-skill
Clone the repo
git clone --depth 1 https://github.com/eugenelim/agent-ready-repo

Made for: Claude Code.

Or install agent-skill-engineering, the plugin that ships this one along with the rest of its 7 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 author-or-update-agent-skill

README.md
[![agentmods](https://agentmods.dev/badge/skills/eugenelim/agent-ready-repo/author-or-update-agent-skill/github.svg)](https://agentmods.dev/skills/eugenelim/agent-ready-repo/author-or-update-agent-skill)
Your own site
<a href="https://agentmods.dev/skills/eugenelim/agent-ready-repo/author-or-update-agent-skill"><img src="https://agentmods.dev/badge/skills/eugenelim/agent-ready-repo/author-or-update-agent-skill/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 author-or-update-agent-skill

Your own site · 80×15
<a href="https://agentmods.dev/skills/eugenelim/agent-ready-repo/author-or-update-agent-skill"><img src="https://agentmods.dev/badge/skills/eugenelim/agent-ready-repo/author-or-update-agent-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 154 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,418 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00154 $0.01418
Opus 5 $0.00077 $0.00709
Sonnet 5 $0.00031 $0.00284
Haiku 4.5 $0.00015 $0.00142

Measured 8d ago against content hash 3b471136a404, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

author-or-update-agent-skill 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 8d 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.

packs/agent-skill-engineering/.apm/skills/author-or-update-agent-skill/SKILL.md · 117 lines

How it starts

The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Author or update an agent skill

Build the smallest portable skill that changes an agent's decisions for the requested task. Preserve the user's intent, existing behavior, and authority.

Modes

frame is the default and is read-only. Move to create or update only after an explicit mode transition and immediately before the first write.

Identifying which mode the work will need is not entering it. Naming the target and the eventual mode is this workflow's first step and happens in frame; entering create or update is a separate act that happens immediately before the first write. Until that transition the receipt reports Mode: frame, however far the plan has progressed — a fully specified patch that has not been authorized is still framing. Report the mode you are acting in, never the one the request names or the one the work is heading toward.

knowledge-provider is entered read-only and never carries write authority on entry; move from knowledge-provider to a write only after the user authorizes that write in its own explicit transition.

Read the full file on GitHub · 117 lines

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. 8d ago First seen · 117 lines · 154 tokens per session scan A 3b471136a404

Subscribe to this mod's changes

author-or-update-agent-skill is a skill published in the GitHub repository eugenelim/agent-ready-repo (21 stars, last pushed today), licensed Apache-2.0. It adds 154 tokens to every session and 1,418 once invoked, about $0.0008 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 2026-09-03.

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