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/bjcoombs/ai-native-toolkit/skill-forgenpx skills add bjcoombs/ai-native-toolkit --skill skill-forgegit clone --depth 1 https://github.com/bjcoombs/ai-native-toolkitWhat 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 | $0.00156 | $0.06140 |
| Opus 5 | $0.00078 | $0.03070 |
| Sonnet 5 | $0.00031 | $0.01228 |
| Haiku 4.5 | $0.00016 | $0.00614 |
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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill-forge - judge-panel skill-hardening harness
A lead (the Forge Master) chairs ephemeral runner teammates that exercise a draft document via prompt-injection, and a persistent judge panel that scores the transcripts. The lead amends one thing per round and applies a strict 3-tier promotion gate, until the document promotes or hits a budget ceiling. It is proven by forging itself.
The target is a SKILL.md by default, but the same loop hardens any agent instruction file - CLAUDE.md, AGENTS.md, GEMINI.md, .cursor/rules/*, .github/copilot-instructions.md - because those files have the same failure surface as a skill: they steer an agent and can mislead it. The artifact type is detected deterministically and drives three adaptations (the lens set, the runner variant, and the canonical intent); see Artifact type and the lens-selector below.
Boundary
Skill-forge is a prove-and-promote quality gate that runs after authoring, not an authoring tool: it pairs with authoring skills (brainstorming, superpowers writing-skills) that produce a draft, then drives that draft through adversarial rounds before it ships. For an instruction file the same boundary holds - it gates a CLAUDE.md/AGENTS.md that already exists or has just been drafted; it does not write one from scratch.
Input contract
| Input | Required | Notes |
|---|---|---|
| Target | yes | Path to a SKILL.md (default), or to any agent instruction file (CLAUDE.md, AGENTS.md, GEMINI.md, .cursor/rules/*, .github/copilot-instructions.md), or inline draft text. The artifact type is detected from the path/filename - see Artifact type and the lens-selector. |
| Intent / spec | yes | What it should do and who/what should trigger it. The ground truth the Fidelity lens judges against. For an instruction file the canonical intent is derivable - see the derivation guard below. |
| Known failure modes / existing tests | no | Seeds the test corpus. |
What ships with it
10 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.
- references/forge-report-template.md 4.9 KB
- references/gate-hierarchy.md 6.1 KB
- references/judge-lenses.md 9.8 KB
- references/panel-ledger.md 4.8 KB
- references/test-taxonomy.md 6.7 KB
- tests/fixtures/flawed-instruction-file/check_counts.py 1.8 KB runs code
- tests/fixtures/flawed-instruction-file/CLAUDE.md 1.6 KB
- tests/fixtures/flawed-instruction-file/DEFECTS.md 3.3 KB
- tests/fixtures/flawed-sample-skill/DEFECTS.md 3.7 KB
- tests/fixtures/flawed-sample-skill/SKILL.md 1.9 KB
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.
- 3d ago First seen · 176 lines · 156 tokens per session scan A 4f61fad9dd48
skill-forge is a skill published in the GitHub repository bjcoombs/ai-native-toolkit (30 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 156 tokens to every session and 6,140 once invoked, about $0.0008 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.
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