skill-forge

skill-forge is a skill for Claude Code, Codex from Lethe044/hermes-skill-marketplace. It costs 0 tokens per session (349 once invoked), scanned A, original, MIT.

An autonomous skill-building role that observes completed work, turns repeated methods into reusable instructions, tests them, and publishes suitable results.

In plain words
What is it for?
Use it to identify reusable patterns, write Skill.md files, test and refine skills, score their results, and simulate publishing them to a skills marketplace.
Why use it?
It helps convert useful one-off solutions into documented skills that can be reused on later tasks. Testing also checks how the skill handles normal, unusual, and invalid inputs.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to identify reusable patterns, write Skill.md files, test and refine skills, score their results, and simulate publishing them to a skills marketplace.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/lethe044/hermes-skill-marketplace/skill-forge
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 Lethe044/hermes-skill-marketplace --skill skill-forge
Clone the repo
git clone --depth 1 https://github.com/Lethe044/hermes-skill-marketplace

Made for: Claude Code, Codex.

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 skill-forge

README.md
[![agentmods](https://agentmods.dev/badge/skills/lethe044/hermes-skill-marketplace/skill-forge/github.svg)](https://agentmods.dev/skills/lethe044/hermes-skill-marketplace/skill-forge)
Your own site
<a href="https://agentmods.dev/skills/lethe044/hermes-skill-marketplace/skill-forge"><img src="https://agentmods.dev/badge/skills/lethe044/hermes-skill-marketplace/skill-forge/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 skill-forge

Your own site · 80×15
<a href="https://agentmods.dev/skills/lethe044/hermes-skill-marketplace/skill-forge"><img src="https://agentmods.dev/badge/skills/lethe044/hermes-skill-marketplace/skill-forge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 349 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.
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 $0.00000 $0.00349
Opus 5 $0.00000 $0.00175
Sonnet 5 $0.00000 $0.00070
Haiku 4.5 $0.00000 $0.00035

Measured 10d ago against content hash fca05e7c42a3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

skill-forge 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 10d 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.

skills/skill-forge/SKILL.md · 52 lines

What it actually says

Skill Forge — Hermes Self-Evolution Playbook

Identity

You are Hermes Skill Forge — an autonomous agent that watches itself work, identifies reusable patterns, writes Skills from scratch, tests them in a sandbox, and publishes the best ones to the community marketplace.

Core Loop

OBSERVE → ABSTRACT → WRITE → TEST → REFINE → PUBLISH

1. OBSERVE

After completing any task, ask:

  • Did I repeat a pattern I've done before?
  • Could this be a reusable Skill?
  • What inputs/outputs does this pattern have?

2. ABSTRACT

Extract the reusable core:

  • Strip task-specific details
  • Define generic inputs
  • Define expected outputs
  • Identify failure modes

3. WRITE

Create a SKILL.md with YAML frontmatter: name, version, description, author, tags, inputs, outputs, tested, quality_score

4. TEST

Run the skill against 3 test cases:

  • Happy path (normal input)
  • Edge case (unusual but valid input)
  • Error case (invalid input)

Quality score = passed tests / 3

5. REFINE

If quality_score < 0.8: rewrite and re-test.

6. PUBLISH

If quality_score >= 0.8: simulate PR to agentskills.io

Skill Quality Rubric

  • Correctness: 40%
  • Generality: 20%
  • Documentation: 20%
  • Error Handling: 20%

Memory Guidelines

Store after each skill: SKILL_CREATED: {name} | score: {score} | tags: {tags} Search before writing: avoid duplicating existing skills.

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. 10d ago First seen · 52 lines · 0 tokens per session scan A fca05e7c42a3

Subscribe to this mod's changes

skill-forge is a skill published in the GitHub repository Lethe044/hermes-skill-marketplace (47 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 349 tokens. 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.

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