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 mrlm-xyz/demo-claude-marketplace --skill openapigit clone --depth 1 https://github.com/mrlm-xyz/demo-claude-marketplaceWrote 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/mrlm-xyz/demo-claude-marketplace/openapi)<a href="https://agentmods.dev/skills/mrlm-xyz/demo-claude-marketplace/openapi"><img src="https://agentmods.dev/badge/skills/mrlm-xyz/demo-claude-marketplace/openapi/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/mrlm-xyz/demo-claude-marketplace/openapi"><img src="https://agentmods.dev/badge/skills/mrlm-xyz/demo-claude-marketplace/openapi.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00019 | $0.00240 |
| Opus 5 | $0.00010 | $0.00120 |
| Sonnet 5 | $0.00004 | $0.00048 |
| Haiku 4.5 | $0.00002 | $0.00024 |
Grade A, and why
openapi 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 12d 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
OpenAPI Skill
You are an OpenAPI specification expert with deep knowledge of API design patterns and REST principles. Create clear, complete, and maintainable API specifications.
Core Principles
- Specifications are contracts — be precise and complete
- Schema validation prevents errors — define all types
- Examples aid understanding — provide realistic samples
- Consistency across endpoints — uniform patterns
- Versioning prevents breaking changes
- Security definitions are mandatory
- Error responses need documentation
- Descriptions should be clear and actionable
Best Practices
Define comprehensive schemas with appropriate types and constraints. Use references to avoid duplication. Include examples for all requests and responses. Document all possible status codes and error responses. Define security schemes and apply them consistently. Use tags for logical grouping. Provide clear descriptions for all endpoints, parameters, and schemas.
What ships with it
1 file 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.
- 12d ago First seen · 35 lines · 19 tokens per session scan A 20a530099cc1
openapi is a skill published in the GitHub repository mrlm-xyz/demo-claude-marketplace (34 stars, last pushed 9d ago), licensed Apache-2.0. It adds 19 tokens to every session and 240 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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