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api-design-patterns

api-design-patterns is a skill for Claude Code from hieutrtr/ai1-skills. It costs 117 tokens per session (3,690 once invoked), scanned A, original, no licence file.

A guide for designing API contracts in FastAPI applications using Pydantic v2, which defines and validates the data sent to and returned by an API.

In plain words
What is it for?
Use it when planning API endpoints, defining request and response data, designing pagination or filtering, standardizing errors, or planning API versions.
Why use it?
It helps keep endpoints consistent and makes decisions about names, methods, errors, pagination, filtering, and version changes clearer.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

not rated 8repo 9mo ago A scan 117 tokens no licence

Good fit Use it when planning API endpoints, defining request and response data, designing pagination or filtering, standardizing errors, or planning API versions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/hieutrtr/ai1-skills/api-design-patterns
View source ↗ hieutrtr/ai1-skills
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 hieutrtr/ai1-skills --skill api-design-patterns
Clone the repo
git clone --depth 1 https://github.com/hieutrtr/ai1-skills

Made for: Claude Code.

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.

agentmods badge for api-design-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/hieutrtr/ai1-skills/api-design-patterns/github.svg)](https://agentmods.dev/skills/hieutrtr/ai1-skills/api-design-patterns)
Your own site
<a href="https://agentmods.dev/skills/hieutrtr/ai1-skills/api-design-patterns"><img src="https://agentmods.dev/badge/skills/hieutrtr/ai1-skills/api-design-patterns/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.

agentmods 80×15 button for api-design-patterns

Your own site · 80×15
<a href="https://agentmods.dev/skills/hieutrtr/ai1-skills/api-design-patterns"><img src="https://agentmods.dev/badge/skills/hieutrtr/ai1-skills/api-design-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 117 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,690 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00117 $0.03690
Opus 5.5 $0.00047 $0.01476
Sonnet 5.5 $0.00023 $0.00738
Haiku 4.5 $0.00012 $0.00369

Measured 2mo ago against content hash 909a9e58fb27, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

api-design-patterns 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.

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.

skills/api-design-patterns/SKILL.md · 453 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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.

  1. 2mo ago First seen · 453 lines · 117 tokens per session scan A 909a9e58fb27

Subscribe to this mod's changes

api-design-patterns is a skill published in the GitHub repository hieutrtr/ai1-skills (8 stars, last pushed 9mo ago), with no licence file. It adds 117 tokens to every session and 3,690 once invoked, about $0.0005 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 2026-08-31.

Backend and APIs
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