add-skill

add-skill is a skill for Claude Code from jmagly/aiwg. It costs 17 tokens per session (1,390 once invoked), scanned A, original, MIT.

A scaffolding tool that creates a new SKILL.md file inside an existing add-on or framework.

In plain words
What is it for?
Use it to create a named skill, derive a skill from a description, or design one interactively for a chosen target.
Why use it?
It avoids setting up the file and its basic structure by hand when adding a new reusable instruction set.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution.

Good fit Use it to create a named skill, derive a skill from a description, or design one interactively for a chosen target.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jmagly/aiwg/add-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 jmagly/aiwg --skill add-skill
Clone the repo
git clone --depth 1 https://github.com/jmagly/aiwg

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 add-skill

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/jmagly/aiwg/add-skill"><img src="https://agentmods.dev/badge/skills/jmagly/aiwg/add-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,390 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 warn 7 Sept 2026
SkillSpector: 4 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Rogue Agent · line 179
    Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.
    Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
  • medium Agent Snooping · line 196
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
  • medium Agent Snooping · line 204
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
  • medium Agent Snooping · line 217
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 $0.00017 $0.01390
Opus 5 $0.00009 $0.00695
Sonnet 5 $0.00003 $0.00278
Haiku 4.5 $0.00002 $0.00139

Measured 9d ago against content hash 4d4ccc7dfa34, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

add-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 9d 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.

agentic/code/addons/aiwg-utils/skills/add-skill/SKILL.md · 221 lines

How it starts

The opening of the file, as written. The whole thing — 221 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add Skill

Scaffold a new SKILL.md inside an existing addon or framework.

Triggers

Alternate expressions and non-obvious activations (primary phrases are matched automatically from the skill description):

  • "I need a new skill" → scaffold skill in specified target
  • "make a skill that does X" → derive name from description, prompt for target
  • "add a natural language skill" → clarify name and target, then scaffold
  • "skill for X" → derive name, prompt for target

Trigger Patterns Reference

Pattern Example Action
Named add "add skill voice-apply --to voice-framework" Scaffold directly
Description-driven "create a skill that validates metadata" Derive name=validate-metadata, prompt target
Interactive "add skill --interactive --to aiwg-utils" Guided design mode
Target omitted "add skill my-skill" Ask which addon or framework

Process

1. Parse Arguments

Extract from $ARGUMENTS:

  • <name> — kebab-case skill name (required)
  • --to <target> — addon or framework directory name (required; skills cannot be added to extensions)
  • --interactive — enable guided design questions

If either <name> or --to is missing, ask before proceeding.

Note: Skills cannot be added to extensions. Extensions provide language/ecosystem-specific capabilities; skills require standalone, cross-cutting functionality.

2. Validate Target

Confirm the target addon or framework exists:

# Check addons
ls agentic/code/addons/<target>/

# Check frameworks
ls agentic/code/frameworks/<target>/

If target is an extension directory, explain the constraint and suggest using an addon instead.

3. Interactive Design (if --interactive)

Guide through skill design before generating:

  1. Purpose: What does this skill do in one sentence?
  2. Trigger phrases: What natural language phrases activate it?
    • Provide 3-5 examples covering common variations
  3. Input: What does the skill need? (content, file path, parameters)
  4. Process: What are the 3-7 execution steps?
  5. Output: What does it produce? (transformed content, report, status)
  6. Reference materials: Does it need supporting docs in references/?
  7. Platform targeting: Which platforms should it deploy to?

Read the full file on GitHub · 221 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. 9d ago First seen · 221 lines · 17 tokens per session scan A 4d4ccc7dfa34

Subscribe to this mod's changes

add-skill is a skill published in the GitHub repository jmagly/aiwg (211 stars, last pushed yesterday), licensed MIT. It adds 17 tokens to every session and 1,390 once invoked, about $0.0001 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.