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 iradoweck/antigravity-awesome-skills --skill api-designergit clone --depth 1 https://github.com/iradoweck/antigravity-awesome-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/iradoweck/antigravity-awesome-skills/api-designer)<a href="https://agentmods.dev/skills/iradoweck/antigravity-awesome-skills/api-designer"><img src="https://agentmods.dev/badge/skills/iradoweck/antigravity-awesome-skills/api-designer/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/iradoweck/antigravity-awesome-skills/api-designer"><img src="https://agentmods.dev/badge/skills/iradoweck/antigravity-awesome-skills/api-designer.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 | $0.00023 | $0.01605 |
| Opus 5.5 | $0.00009 | $0.00642 |
| Sonnet 5.5 | $0.00005 | $0.00321 |
| Haiku 4.5 | $0.00002 | $0.00161 |
Grade A, and why
api-designer 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 10d 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.
This is a copy
100% identical to api-designer — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Supporting material availability
This catalog copy contains the inline guidance below, but does not include the following supporting paths. They are external prerequisites, not bundled files:
<support-root>/references/domains.md<support-root>/references/testmu_example.md
Obtain the required material from the declared upstream source, or from a user-provided installation of that source. Resolve each path relative to that installation, inspect its contents, and verify any applicable license and execution prerequisites. Do not run a command or claim a referenced procedure was followed until its required file exists. Do not fabricate the missing scripts or treat an unrelated file with the same name as equivalent. Independent steps fully documented here can proceed within the user’s authorized scope; report any dependent step as unavailable.
API Designer Skill
When to Use
Use this skill when you need generates complete, production-ready REST API endpoint specifications for any system or domain the user describes. Use this skill whenever the user asks about API design, API endpoints, REST APIs, API URLs, or says things like "what endpoints do I need for...", "design an API for...",...
You are an expert API architect.
Ask the user if they want just the endpoints or complete detailed response (Enpoints Only/Detail Design). Do not ask these options if the user has specified the details of his requirement in the input already. If the user says Endpoints Only:
- Output only the endpoints If the user says Detail Design:
- Output complete design as the structure described in this skill.
Output Format
First list down all the endpoints one after another as output then expand each in this exact structure for each endpoint group (resource):
RESOURCE NAME
METHOD /path/to/endpoint
Short description of what this endpoint does. Not more than two lines.
Headers
| Header | Value | Required |
|---|---|---|
Content-Type |
application/json |
Yes |
Authorization |
Bearer <token> |
Yes/No |
X-Api-Key |
<api-key> |
Yes/No |
| (add others as relevant) |
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.
- 10d ago Changed · +9 lines a031cfb9c658
- 1mo ago Changed · -39 tokens per session ba65d90c01ee
- 1mo ago First seen · 168 lines · 62 tokens per session scan A 61d04dca68e2
api-designer is a skill published in the GitHub repository iradoweck/antigravity-awesome-skills (30 stars, last pushed 4d ago), licensed MIT. It adds 23 tokens to every session and 1,605 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to api-designer, differing in 6 lines, and is treated as a copy.
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