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.
npx agentmods add skills/jdforsythe/forge/skill-creatornpx skills add jdforsythe/forge --skill skill-creatorgit clone --depth 1 https://github.com/jdforsythe/forgeWrote 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.
[](https://agentmods.dev/skills/jdforsythe/forge/skill-creator)<a href="https://agentmods.dev/skills/jdforsythe/forge/skill-creator"><img src="https://agentmods.dev/badge/skills/jdforsythe/forge/skill-creator.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00147 | $0.03470 |
| Opus 5 | $0.00073 | $0.01735 |
| Sonnet 5 | $0.00029 | $0.00694 |
| Haiku 4.5 | $0.00015 | $0.00347 |
Grade B, and why
skill-creator 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 5d 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.
Asks the agent to reveal its instructionsmediumSystem prompt leakage
Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.
### 9. Reasoning-Echo Instructions How it starts
The opening of the file, as written. The whole thing — 255 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
Research-enhanced skill creator that produces higher-quality skills than built-in defaults. Every design decision is grounded in how transformers process context.
Expert Vocabulary Payload
Prompt Engineering & Routing: expert vocabulary payload, dual-register description, vocabulary routing, distributional convergence, attention budget, distribution center, right altitude, retrieval anchor
Skill Architecture: progressive disclosure, context window management, U-shaped attention curve, YAML frontmatter, trigger surface, structural delineation, three-level loading (metadata / SKILL.md / references)
Behavioral Design: anti-pattern watchlist, detection signal, counter-example, imperative instruction, conditional branching, evaluation criteria
Quality & Testing: canonical example, few-shot learning, 15-year practitioner test, consultant-speak (banned), over-prompting, recency bias
Anti-Pattern Watchlist
These are anti-patterns in the skills this creator generates. Scan every generated SKILL.md against this list before delivery.
1. Generic Consultant-Speak in Vocabulary
Detection: Vocabulary payload contains terms like "best practices," "leverage," "synergy," "robust solution," "scalable framework," or "holistic approach." Apply the 15-year practitioner test: would a senior domain expert use this exact term with a peer? If not, it fails. Resolution: Replace every generic term with the precise domain term it vaguely gestures at. "Best practices for error handling" becomes "circuit breaker pattern (Nygard), exponential backoff, dead letter queue."
2. Over-Prompting
Detection: SKILL.md exceeds 500 lines. The same concept is stated 2-3 times in different words "for emphasis." Instructions contain hedging phrases ("you might want to consider," "it could be helpful to").
Resolution: State each instruction once, in imperative form. Remove hedging. Move heavy reference content to references/. Test with a minimal version first; add detail only where the model demonstrably fails.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 255 lines · 147 tokens per session scan B b1844bdf9d46
skill-creator is a skill published in the GitHub repository jdforsythe/forge (151 stars, last pushed 2mo ago), licensed MIT. It adds 147 tokens to every session and 3,470 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it B with 1 finding (asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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