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 skills add williamhallatt/cogworks --skill cg-buildgit clone --depth 1 https://github.com/williamhallatt/cogworksWrote 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/williamhallatt/cogworks/cg-build)<a href="https://agentmods.dev/skills/williamhallatt/cogworks/cg-build"><img src="https://agentmods.dev/badge/skills/williamhallatt/cogworks/cg-build/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.
<a href="https://agentmods.dev/skills/williamhallatt/cogworks/cg-build"><img src="https://agentmods.dev/badge/skills/williamhallatt/cogworks/cg-build.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00042 | $0.01506 |
| Opus 5 | $0.00021 | $0.00753 |
| Sonnet 5 | $0.00008 | $0.00301 |
| Haiku 4.5 | $0.00004 | $0.00151 |
Grade A, and why
cg-build 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 9d 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 — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Writer Expert
Role
Create or revise agent skills so they are:
- faithful to source material
- immediately actionable
- context-efficient
- structurally valid for their target runtime
For generated skills, the priority order is: fidelity > judgment density > drift resistance > context efficiency > composability
When To Use
Use this skill when:
- creating or revising a cogworks-generated skill
- revising an existing
SKILL.mdthat must preserve an explicit skill contract - validating frontmatter, invocation, compatibility, or supporting-file layout
- tightening generated-skill quality gates
Do not use it for generic prompt brainstorming, open-ended writing help, or skill work with no clear contract to preserve.
Quick Decision Cheatsheet
- keep
SKILL.mdas an entry contract, not a reference manual - place normative doctrine in
reference.md - add Compatibility only when runtime-specific features require it
- delete or absorb support files that mainly restate
reference.md - stop on blocking validation failures instead of polishing around them
Execution Posture
Keep going until the requested skill-writing phase is complete or a blocking validation defect is surfaced.
If a runtime detail, file contract, or compatibility rule is uncertain, verify it with a tool call before relying on it.
Before each stage:
- plan the exact artifact to produce
- load only the doctrine needed for that stage
- stop on missing inputs or blocking validation failures
When invoked directly for a small review, answer briefly. When invoked for full generation or rewrite, follow the staged contract below.
For direct responses, keep the output shape explicit:
- small reviews: return 1-3 findings or one short paragraph plus concrete fixes
- full generation or rewrite: keep each stage summary to one short paragraph or a short flat list
Invocation
Use this skill to:
- create or revise skill files
- validate structure and compatibility
- tighten generated-skill doctrine without widening scope
What ships with it
4 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.
- 9d ago Changed · +33 lines · +6 tokens per session 2b1c4e3d5e75
- 10d ago First seen · 164 lines · 36 tokens per session scan A c285123f3229
cg-build is a skill published in the GitHub repository williamhallatt/cogworks (5 stars, last pushed 10d ago), licensed MIT. It adds 42 tokens to every session and 1,506 once invoked, about $0.0002 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 2026-09-05.
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