A guide to designing REST APIs, which are web interfaces that let software exchange data through standard requests. It covers names, status codes, pagination, filtering, errors, versions, and rate limits.

Planning or reviewing production APIs, including their URLs, responses, error handling, versioning, and request limits.

It helps developers make API behavior consistent and understandable for the programs that use it.

api-design — Skill for Claude Code and Codex by NomaDamas: A guide to designing REST APIs, which are web…

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.

agentmods

npx agentmods add skills/nomadamas/girlfriend-in-cli/api-design

Any agent

npx skills add NomaDamas/girlfriend-in-cli --skill api-design

Clone the repo

git clone --depth 1 https://github.com/NomaDamas/girlfriend-in-cli

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/nomadamas/girlfriend-in-cli/api-design.svg)](https://agentmods.dev/skills/nomadamas/girlfriend-in-cli/api-design)

Your own site

<a href="https://agentmods.dev/skills/nomadamas/girlfriend-in-cli/api-design"><img src="https://agentmods.dev/badge/skills/nomadamas/girlfriend-in-cli/api-design.svg" alt="Measured on agentmods" height="20"></a>

Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,322 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00031	$0.03322
Opus 5	$0.00015	$0.01661
Sonnet 5	$0.00006	$0.00664
Haiku 4.5	$0.00003	$0.00332

Measured 3d ago against content hash d2b090c4319e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-design 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 3d 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.

.agents/skills/api-design/SKILL.md · 524 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

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.

agents/openai.yaml 247 B

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.

3d ago First seen · 524 lines · 31 tokens per session scan A d2b090c4319e

Subscribe to this mod's changes

api-design is a skill published in the GitHub repository NomaDamas/girlfriend-in-cli (59 stars, last pushed 17d ago), with no licence file. It adds 31 tokens to every session and 3,322 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 2026-08-30.

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