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agent-reference-skills: Skill for Claude Code

.agents/skills/update-claude/SKILL.md

update-claude is a skill for Claude Code from Fandhe-AI/agent-reference-skills. It costs 150 tokens per session (7,238 once invoked), scanned C, original, no licence file.

A review and update tool for an existing Claude Code setup, including its instructions, agents, rules, skills, and hooks. It shows gaps and suggests changes for approval before adding them.

In plain words
What is it for?
Use it to inspect and improve a .claude directory, add missing rules or skills, and check prerequisites before implementing issue trees.
Why use it?
It helps bring an existing setup closer to an intended structure without overwriting its current files.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: model in frontmatter; installed under .agents/ (shared by several agents).

This is Fandhe-AI/agent-reference-skills's own configuration. It tells Claude Code how to work on agent-reference-skills itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agent-reference-skills configures →

not rated 4repo changed 23d ago C scan 150 tokens no licence
View source ↗ Fandhe-AI/agent-reference-skills
Reuse

Borrowing it

Nothing to install: this file belongs to Fandhe-AI/agent-reference-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Fandhe-AI/agent-reference-skills/main/.agents/skills/update-claude/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Fandhe-AI/agent-reference-skills

Made for: Claude Code.

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-claude

README.md
[![agentmods](https://agentmods.dev/badge/skills/fandhe-ai/agent-reference-skills/update-claude/github.svg)](https://agentmods.dev/skills/fandhe-ai/agent-reference-skills/update-claude)
Your own site
<a href="https://agentmods.dev/skills/fandhe-ai/agent-reference-skills/update-claude"><img src="https://agentmods.dev/badge/skills/fandhe-ai/agent-reference-skills/update-claude/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-claude

Your own site · 80×15
<a href="https://agentmods.dev/skills/fandhe-ai/agent-reference-skills/update-claude"><img src="https://agentmods.dev/badge/skills/fandhe-ai/agent-reference-skills/update-claude.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 150 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,238 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 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 $0.00150 $0.07238
Opus 5.5 $0.00060 $0.02895
Sonnet 5.5 $0.00030 $0.01448
Haiku 4.5 $0.00015 $0.00724

Measured 23d ago against content hash 6c924dcf5083, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

update-claude scanned grade C with 2 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 23d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (tests/version-pin.test.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

find <target-repo>/.claude/rules -name "*.md" 2>/dev/null | sort

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

ls <target-repo>/.claude/skills/ 2>/dev/null | sort
.agents/skills/update-claude/SKILL.md · 444 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. 23d ago Changed 6c924dcf5083
  2. 1mo ago Changed · +5 lines 8c7dadeb4286
  3. 2mo ago First seen · 439 lines · 150 tokens per session scan C dc248b8c975e

Subscribe to this mod's changes

update-claude is a skill published in the GitHub repository Fandhe-AI/agent-reference-skills (4 stars, last pushed 2d ago), with no licence file. It adds 150 tokens to every session and 7,238 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it C with 2 findings (reads agent configuration directories, enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents
Related

update-claude compared with skills from other repositories

update-claude next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
update-claudeFandhe-AI/agent-reference-skillsSkill42d agononeC150Claude Code
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143ktodayMITA103Claude Code