What is api-designer?

A project skill for designing RESTful web API endpoints and exporting their definitions in OpenAPI, a standard format for describing APIs.

Use it to plan API routes and create an OpenAPI description of them.

It helps turn API requirements into a documented endpoint design that other tools and developers can use.

api-designer — Skill for Claude Code and Codex by Nhqvu2005

Install

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.

Any agent

npx skills add Nhqvu2005/VibeGravityKit --skill api-designer

Clone the repo

git clone --depth 1 https://github.com/Nhqvu2005/VibeGravityKit

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/nhqvu2005/vibegravitykit/api-designer/github.svg)](https://agentmods.dev/skills/nhqvu2005/vibegravitykit/api-designer)

Your own site

<a href="https://agentmods.dev/skills/nhqvu2005/vibegravitykit/api-designer"><img src="https://agentmods.dev/badge/skills/nhqvu2005/vibegravitykit/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/nhqvu2005/vibegravitykit/api-designer"><img src="https://agentmods.dev/badge/skills/nhqvu2005/vibegravitykit/api-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 140 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

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	$0.00017	$0.00140
Opus 5.5	$0.00007	$0.00056
Sonnet 5.5	$0.00003	$0.00028
Haiku 4.5	$0.00002	$0.00014

Measured 2mo ago against content hash 8db621100936, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/api_gen.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

VibeGravityKit/.agent/skills/api-designer/SKILL.md · 23 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

2 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.

Changes

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.

2mo ago First seen · 23 lines · 17 tokens per session scan A 8db621100936

Subscribe to this mod's changes

api-designer is a skill published in the GitHub repository Nhqvu2005/VibeGravityKit (54 stars, last pushed 8mo ago), with no licence file. It adds 17 tokens to every session and 140 once invoked, about $0.0001 per session on Opus 5.5. 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.

Backend and APIs

api-designer next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
api-designerNhqvu2005/VibeGravityKit	Skill	54	8mo ago	none	A	17	Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0	Skill	69k	3d ago	Apache-2.0	A	217	Claude Code, Codex
azure-mgmt-botservice-dotnetmicrosoft/skills	Skill	3.2k	today	MIT	A	78	Claude Code
fastapi-router-pymicrosoft/skills	Skill	3.2k	today	MIT	A	46	Claude Code
api-designericrisco/rsc-harness	Skill	573	today	MIT	A	105	Claude Code, Codex
migrate-segw-to-raparc-mcp/arc-1	Skill	254	today	MIT	A	106	Claude Code
telnyx-messaging-hosted-curlteam-telnyx/ai	Skill	225	today	MIT	A	45	Claude Code