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 joe-broadhead/open-cowork --skill skill-creatorgit clone --depth 1 https://github.com/joe-broadhead/open-coworkWrote 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/joe-broadhead/open-cowork/skill-creator)<a href="https://agentmods.dev/skills/joe-broadhead/open-cowork/skill-creator"><img src="https://agentmods.dev/badge/skills/joe-broadhead/open-cowork/skill-creator/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/joe-broadhead/open-cowork/skill-creator"><img src="https://agentmods.dev/badge/skills/joe-broadhead/open-cowork/skill-creator.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 | $0.00026 | $0.00474 |
| Opus 5 | $0.00013 | $0.00237 |
| Sonnet 5 | $0.00005 | $0.00095 |
| Haiku 4.5 | $0.00003 | $0.00047 |
Grade A, and why
skill-creator 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 11d 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.
What it actually says
Skill Creator
Use this skill when a user wants to create or update an OpenCode skill for Open Cowork.
Purpose
- Turn a rough workflow idea into a reusable skill bundle.
- Keep the skill aligned with the OpenCode skill standard: one
SKILL.mdentrypoint plus optional extra files. - Add extra files only when they materially improve the skill, such as templates, examples, references, or helper assets.
Workflow
- Confirm the skill's job:
- what it helps with
- when it should be used
- what tools it expects or teaches
- Choose a clean skill id:
- lowercase
- hyphenated
- stable and descriptive
- Draft
SKILL.mdwith:- frontmatter
name - frontmatter
description - a short purpose section
- a workflow section
- tool guidance if relevant
- guardrails if misuse is likely
- frontmatter
- Decide whether the bundle needs extra files:
references/*.mdfor longer usage notesexamples/*.mdfor worked examplestemplates/*for reusable output scaffolds- avoid extra files if the skill is simple enough to live in
SKILL.md
- Use the
skillsMCP tools to save the bundle:skills_get_skill_bundlebefore editing an existing skillskills_save_skill_bundleto create or update the bundleskills_list_skill_bundlesto inspect what already exists
- Summarize what was created:
- skill id
- main purpose
- any extra files added
Guardrails
- Do not create vague skills that duplicate general assistant behavior.
- Prefer one focused skill over a broad catch-all.
- Keep instructions operational and reusable.
- If a skill depends on a tool or MCP, state that clearly.
- If no extra files are needed, do not invent them.
Output
- Brief explanation of the skill’s purpose.
- The saved skill id.
- A short note on any supporting files added to the bundle.
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.
- 11d ago First seen · 60 lines · 26 tokens per session scan A 6784b9efe41a
skill-creator is a skill published in the GitHub repository joe-broadhead/open-cowork (11 stars, last pushed 6d ago), licensed MIT. It adds 26 tokens to every session and 474 once invoked, about $0.0001 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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