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update-skill

update-skill is a skill for Claude Code, Codex from edlng/agents. It costs 46 tokens per session (1,001 once invoked), scanned A, original, no licence file.

A skill for modifying existing skills used by AI agents.

In plain words
What is it for?
It is for updating or adapting an existing skill for AI agents.
Why use it?
It gives users a specific workflow for changing a skill instead of editing its instructions without structure.

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 8d ago A scan 46 tokens no licence

Good fit It is for updating or adapting an existing skill for AI agents.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/edlng/agents/update-skill
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 update-skill
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 update-skill

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/edlng/agents/update-skill"><img src="https://agentmods.dev/badge/skills/edlng/agents/update-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,001 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 $0.00046 $0.01001
Opus 5.5 $0.00018 $0.00400
Sonnet 5.5 $0.00009 $0.00200
Haiku 4.5 $0.00005 $0.00100

Measured 8d ago against content hash f203868fee98, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

update-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.

skills/universal/update-skill/SKILL.md · 70 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. 8d ago Changed · +10 lines f203868fee98
  2. 1mo ago Changed · +42 lines · +26 tokens per session 4a51ac9f243a
  3. 2mo ago First seen · 18 lines · 20 tokens per session scan A b05152ec4b75

Subscribe to this mod's changes

update-skill is a skill published in the GitHub repository edlng/agents (2 stars, last pushed 8d ago), with no licence file. It adds 46 tokens to every session and 1,001 once invoked, about $0.0002 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.

Building agents
Related

update-skill compared with skills from other repositories

update-skill next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
update-skilledlng/agentsSkill28d agononeA46Claude Code, Codex
imagegenopenai/codexSkill134ktodayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99ktodayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79ktodayMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill314k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code