create-skill

A generator for creating a new custom coding skill, usually a reusable slash command, from a plain-language description.

In plain words
What is it for?
It helps create skills for analysis, file generation, interactive tasks, or automated workflows, including their project configuration file.
Why use it?
It turns an informal workflow into a defined command with a name, triggers, rules, and an expected result.

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

Made for: Claude Code, Codex.

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 943 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00046 $0.00943
Opus 5 $0.00023 $0.00472
Sonnet 5 $0.00009 $0.00189
Haiku 4.5 $0.00005 $0.00094

Measured 2d ago against content hash 1086c04ef4c1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

create-skill scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

/create-skill api-test automated API endpoint testing with curl
.claude/skills/create-skill/SKILL.md · 174 lines

How it starts

The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/create-skill - Skill Generator

$ARGUMENTS


Purpose

Generate a new Claude Code skill (slash command) from a natural language description. Creates properly structured SKILL.md with frontmatter, behavior rules, and output format.


Behavior

When /create-skill is triggered:

Step 1: Parse Input

Extract from user's description:

  • Skill name: lowercase, hyphenated (e.g., api-test, changelog)
  • Purpose: what the skill does
  • Trigger terms: when should it activate

If input is vague, ask:

  1. What should this skill do?
  2. Does it modify code or only analyze/report?
  3. What sub-commands should it have?

Step 2: Determine Skill Type

Type Characteristics disable-model-invocation
Analysis Read-only, generates reports true
Generator Creates new files/code true
Interactive Asks questions, explores options false
Automation Runs scripts, orchestrates agents true

Step 3: Generate SKILL.md

Create .claude/skills/{name}/SKILL.md with this structure:

---
name: {skill-name}
description: >
  {One-line purpose}.
  Use when: {comma-separated trigger terms}
argument-hint: "{expected arguments}"
user-invocable: true
disable-model-invocation: {true|false}
---

# /{skill-name} - {Title}

$ARGUMENTS

---

## Purpose

{What this skill does and why it exists.}

---

## Sub-commands

{If applicable}

---

## Behavior

When `/{skill-name}` is triggered:

### 1. {First Step}
{Description}

### 2. {Second Step}
{Description}

### 3. {Third Step}
{Description}

---

## Output Format

{Expected output template}

---

## Examples

{Usage examples}

---

## Key Principles

- {Principle 1}
- {Principle 2}
- {Principle 3}

Step 4: Validate

Check generated skill:

  • Name is lowercase, hyphenated, max 30 chars
  • Description fits in 250 chars (budget limit)
  • Has clear trigger terms in description
  • $ARGUMENTS placeholder is present
  • No unsupported frontmatter fields
  • Output format is defined

Read the full file on GitHub · 174 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. 2d ago First seen · 174 lines · 46 tokens per session scan A 1086c04ef4c1

Subscribe to this mod's changes

create-skill is a skill published in the GitHub repository bugrabilge/bilge-development-kit (10 stars, last pushed 4mo ago), licensed MIT. It adds 46 tokens to every session and 943 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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