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 Stijnman/grok-custom-skills --skill skill-marketplace-installergit clone --depth 1 https://github.com/Stijnman/grok-custom-skillsWrote 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/stijnman/grok-custom-skills/skill-marketplace-installer)<a href="https://agentmods.dev/skills/stijnman/grok-custom-skills/skill-marketplace-installer"><img src="https://agentmods.dev/badge/skills/stijnman/grok-custom-skills/skill-marketplace-installer/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/stijnman/grok-custom-skills/skill-marketplace-installer"><img src="https://agentmods.dev/badge/skills/stijnman/grok-custom-skills/skill-marketplace-installer.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 | $0.00040 | $0.00547 |
| Opus 5 | $0.00020 | $0.00273 |
| Sonnet 5 | $0.00008 | $0.00109 |
| Haiku 4.5 | $0.00004 | $0.00055 |
Grade A, and why
skill-marketplace-installer 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.
What it actually says
Skill Marketplace Installer
When to Use
- User says find skill or task matches this capability
- User says install skill or task matches this capability
- User says skill marketplace or task matches this capability
- User says check skill safety or task matches this capability
Workflow
- Search marketplace via documented CLI (npx @agentskill.sh/cli search).
- Show skill name, owner, description, and ratings before install.
- Require explicit user approval before install.
- Run security scan if CLI supports it; warn on suspicious patterns.
- Install to user skills directory; list what was added.
- Never install skills requesting credentials in SKILL.md without user review.
Integrations
skill-rubric-reviewerhitl-approverprivacy-redactor
Error Handling
| Failure | Response |
|---|---|
| CLI unavailable | Document manual install from source URL with rubric review first. |
| Scan flags risk | Block install; explain finding; offer alternatives. |
Gotchas
- Third-party skills are untrusted until reviewed with skill-rubric-reviewer.
Safety & Ethics (Publication-Ready)
This skill is designed for public distribution. Constraints:
- User consent required before every install.
- Recommends security scan before install when available.
- Attributes agentskill.sh CLI; does not bundle proprietary marketplace code.
- No silent telemetry or auto-rating posts in this skill.
Prohibited actions
- No unauthorized access, malware, or harmful automation
- No silent exfiltration of data, credentials, or telemetry
- No destructive system changes without hitl-approver
- No publication of user PII or environment secrets in outputs
Attribution
- Compatible with agentskill.sh CLI; marketplace terms apply to installed skills.
Example
Input: User request matching triggers above. Output: Structured result per workflow; local artifacts only unless user opts in.
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 First seen · 72 lines · 40 tokens per session scan A 4f5f2deb2ccf
skill-marketplace-installer is a skill published in the GitHub repository Stijnman/grok-custom-skills (9 stars, last pushed 2d ago), licensed MIT. It adds 40 tokens to every session and 547 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 2026-09-03.
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