What is aigent-builder?

A skill-generation workflow that creates SKILL.md files and their folders from a plain-language description. SKILL.md is the instruction file an agent skill uses to describe its behavior.

Use it to scaffold new agent skills, generate their instruction files, and check that they follow the stated skill format.

It removes the need to design the folder structure and required metadata by hand, and can validate the generated result.

aigent-builder — Skill for Claude Code by wkusnierczyk/aigent

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 wkusnierczyk/aigent --skill aigent-builder

Clone the repo

git clone --depth 1 https://github.com/wkusnierczyk/aigent

Made for: Claude Code.

Or install aigent, the plugin that ships this one along with the rest of its 3 skills, 1 hook.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wkusnierczyk/aigent/aigent-builder/github.svg)](https://agentmods.dev/skills/wkusnierczyk/aigent/aigent-builder)

Your own site

<a href="https://agentmods.dev/skills/wkusnierczyk/aigent/aigent-builder"><img src="https://agentmods.dev/badge/skills/wkusnierczyk/aigent/aigent-builder/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/wkusnierczyk/aigent/aigent-builder"><img src="https://agentmods.dev/badge/skills/wkusnierczyk/aigent/aigent-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 553 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00058	$0.00553
Opus 5.5	$0.00023	$0.00221
Sonnet 5.5	$0.00012	$0.00111
Haiku 4.5	$0.00006	$0.00055

Measured 1mo ago against content hash 3e2d1d67f685, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

aigent-builder scanned grade B 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 1mo 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.

Enumerates other installed skillsmediumAgent snooping

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

aigent new "<purpose>" --dir .claude/skills/<name>/

skills/aigent-builder/SKILL.md · 94 lines

What it actually says

Skill Builder

Setup

Check if aigent is available:

command -v aigent

With aigent CLI

If aigent is on $PATH, use the CLI for authoritative skill generation:

Build the skill:

aigent new "<purpose>" --dir .claude/skills/<name>/

Validate the result:
```
aigent validate .claude/skills/<name>/
```
If validation reports errors, fix the SKILL.md and re-validate.

Use --no-llm to force deterministic mode (no API keys needed). Use --name <name> to override the derived skill name.

The CLI defaults to outputting in ./<name>/ in the current directory. The --dir flag above overrides this to place skills in .claude/skills/, which is the standard Claude Code skill location.

Without aigent CLI

If aigent is not available, generate the SKILL.md directly.

Name rules

Lowercase letters, numbers, and hyphens only
Maximum 64 characters
Prefer gerund form: "processing-pdfs", "analyzing-data"
No reserved words: "anthropic", "claude"
No XML tags
Must match directory name

Description rules

Non-empty, maximum 1024 characters
Third person: "Processes PDFs..." not "I process PDFs..."
Include what the skill does AND when to use it
No XML tags

Body guidelines

Keep under 500 lines
Be concise — only add context Claude doesn't already have
Use ## headings for sections
Link to additional files for large content

Output

Write the SKILL.md to .claude/skills/<name>/SKILL.md with:

---
name: <kebab-case-name>
description: <what-it-does-and-when-to-use-it>
---

# <Title>

## Quick start

[Concise instructions]

## Usage

[Detailed usage]

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.

1mo ago First seen · 94 lines · 58 tokens per session scan B 3e2d1d67f685

Subscribe to this mod's changes

aigent-builder is a skill published in the GitHub repository wkusnierczyk/aigent (4 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 58 tokens to every session and 553 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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