skill-developer

A guide for creating and managing Claude Code skills according to Anthropic's recommended practices. It covers skill structure, activation rules, hooks, and debugging.

In plain words
What is it for?
Use it to create skills, change skill-rules.json, define trigger patterns, work with hooks, and debug skill activation.
Why use it?
It helps make skills easier to trigger correctly and maintain over time.

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/deomiarn/claude-setup-template/skill-developer
Any agent
npx skills add deomiarn/claude-setup-template --skill skill-developer
Clone the repo
git clone --depth 1 https://github.com/deomiarn/claude-setup-template

Made for: Claude Code, Codex.

Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,914 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 $0.00097 $0.02914
Opus 5 $0.00048 $0.01457
Sonnet 5 $0.00019 $0.00583
Haiku 4.5 $0.00010 $0.00291

Measured 2d ago against content hash f4b4a4cd9ae4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

skill-developer 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 2d 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.

.claude/skills/skill-developer/SKILL.md · 427 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

5 files 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. 2d ago First seen · 427 lines · 97 tokens per session scan A f4b4a4cd9ae4

Subscribe to this mod's changes

skill-developer is a skill published in the GitHub repository deomiarn/claude-setup-template (5 stars, last pushed 9mo ago), with no licence file. It adds 97 tokens to every session and 2,914 once invoked, about $0.0005 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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