skill-builder

A command that creates a new Forge Skill with a standard folder structure and required files. A skill is a reusable set of instructions for a coding agent.

In plain words
What is it for?
Scaffolding a skill, filling in its required documentation, and checking it with the project's skill validator.
Why use it?
It removes the need to remember the expected files, sections, and validation steps when starting a skill.

Command for Claude Code

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 commands/zxpmail/reqforge/skill-builder
Clone the repo
git clone --depth 1 https://github.com/zxpmail/ReqForge

Made for: Claude Code.

Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 120 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00008 $0.00120
Opus 5 $0.00004 $0.00060
Sonnet 5 $0.00002 $0.00024
Haiku 4.5 $0.00001 $0.00012

Measured yesterday against content hash 063b14fcfe13, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

skill-builder 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 yesterday.

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.

adapters/claude-code/.claude/skills/skill-builder/commands/skill-builder.md · 15 lines

What it actually says

Command: /skill-builder

Entry: /skill-builder <skill-name>. Full workflow → SKILL.md.

Phase SKILL.md Acceptance
Scaffold Phase 1 Directory + skill.json + commands/
Content Phase 2 Required SKILL sections complete
Quality Phase 3 pnpm validate-skill pass; score ≥24 if using rubric
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. yesterday First seen · 15 lines · 8 tokens per session scan A 063b14fcfe13

Subscribe to this mod's changes

skill-builder is a command published in the GitHub repository zxpmail/ReqForge (18 stars, last pushed 11d ago), licensed MIT. It adds 8 tokens to every session and 120 once invoked, about $0.0000 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 2026-08-30.