A reusable skill for creating or updating instructions that an AI coding agent can follow for a recurring workflow.

Use it when asked to create a skill, or when a reliable multi-step workflow should be saved for future agent sessions.

It turns a repeated solution or project convention into documented steps that can be reused in later sessions.

skillforge — Skill for Claude Code and Codex by zakelfassi

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 zakelfassi/skills-driven-development --skill skillforge

Clone the repo

git clone --depth 1 https://github.com/zakelfassi/skills-driven-development

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/zakelfassi/skills-driven-development/skillforge/github.svg)](https://agentmods.dev/skills/zakelfassi/skills-driven-development/skillforge)

Your own site

<a href="https://agentmods.dev/skills/zakelfassi/skills-driven-development/skillforge"><img src="https://agentmods.dev/badge/skills/zakelfassi/skills-driven-development/skillforge/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/zakelfassi/skills-driven-development/skillforge"><img src="https://agentmods.dev/badge/skills/zakelfassi/skills-driven-development/skillforge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 822 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.

Model	Per session	Once invoked
Fable 5.1	$0.00041	$0.00822
Opus 5.5	$0.00016	$0.00329
Sonnet 5.5	$0.00008	$0.00164
Haiku 4.5	$0.00004	$0.00082

Measured 1mo ago against content hash 5c06ae560c66, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skillforge 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 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.

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.

plugins/skdd-claude/skills/skillforge/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SkillForge

Create well-formed, spec-compliant skills from observed patterns.

When to Forge

✅ Forge when:

You've done the same sequence 2-3 times in a session
A project convention isn't documented anywhere
You solved a hard problem with a reusable solution
Someone asks you to create a skill

❌ Don't forge when:

It's a one-time task
An existing skill already covers it (update instead)
The "skill" is just a single command (use a script alias)

Steps

1. Name the pattern

What problem does this skill solve?
What triggers it? (be specific — the description field is the discovery surface)
What are the inputs and outputs?

2. Choose a name

kebab-case, 1-64 characters
Verb-led when possible: deploy-preview, scaffold-component, triage-bug
One responsibility per skill

3. Create the skill directory

mkdir -p .claude/skills/<skill-name>

(Or .codex/skills/, .cursor/skills/, .github/skills/, etc. — match the harness. In Claude Code this plugin targets .claude/skills/.)

4. Write SKILL.md

Use this skeleton:

---
name: <skill-name>
description: <what it does>. Use when <triggers>.
metadata:
  forged-by: <agent-id>
  forged-from: <session-or-context>
  forged-reason: "<why this was created>"
  status: active
---

# <Skill Name>

## Inputs
- ...

## Steps
1. ...
2. ...

## Conventions
- Project-specific patterns that apply

## Edge Cases
- Known gotchas or special handling

5. Add scripts (optional)

If the skill involves file generation or automation:

.claude/skills/<skill-name>/
├── SKILL.md
├── scripts/
│   └── run.sh         # Executable automation
└── references/
    └── conventions.md # Detailed reference (keeps SKILL.md lean)

6. Register the skill

Update .skills-registry.md at the project root (same level as .claude/). Create it if it doesn't exist:

| <skill-name> | local | <today> | 1 | <description> |

If the project uses the machine-readable registry (.skills-registry.json), update it too — the skdd CLI handles both formats automatically.

Read the full file on GitHub · 121 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.

1mo ago First seen · 121 lines · 41 tokens per session scan A 5c06ae560c66

Subscribe to this mod's changes

skillforge is a skill published in the GitHub repository zakelfassi/skills-driven-development (18 stars, last pushed 3mo ago), licensed MIT. It adds 41 tokens to every session and 822 once invoked, about $0.0002 per session on Opus 5.5. 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.

Building agents agent-skills agentic-development ai ai-agents developer-tools skills

code-simplifier

Always-active simplicity rules: no speculative abstractions, one job per function, max 30 lines, flat over nested with early returns, descriptive names, comments explain why.

yeisonrestrepo/code-conductor · 38 tokens

critical-review

4-phase adversarial review protocol: pre-flight analysis, adversarial execution check, self-correction loop, and [VALIDATION] report.

yeisonrestrepo/code-conductor · 30 tokens

agent-delegation

Rules for when and how to spawn sub-agents: Explore for 3+ file reads, parallel agents for independent tasks, summaries only — raw output never enters main context.

yeisonrestrepo/code-conductor · 39 tokens

memory-first

Lookup chain enforced before any file read or search: project and global memory, grep/glob, targeted read — stop at the first step that answers.

yeisonrestrepo/code-conductor · 32 tokens

verbosity

Response verbosity protocol: reads the level from /.claude/memory/verbosity.md and applies the MIN, INFO or VERBOSE output rules to every reply.