api-endpoint

api-endpoint is a skill for Claude Code, Codex from berkcangumusisik/claude-code-practices. It costs 19 tokens per session (277 once invoked), scanned A, original, MIT.

A skill that scaffolds a complete web API endpoint with request validation, error handling, route registration, and tests.

In plain words
What is it for?
Adding routes to Express, Fastify, Hono, Koa, or NestJS applications, with success, validation, authentication, and not-found tests where relevant.
Why use it?
It reduces repetitive setup and helps new endpoints follow the project’s existing patterns.

Skill for Claude CodeCodex

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/berkcangumusisik/claude-code-practices/api-endpoint
Any agent
npx skills add berkcangumusisik/claude-code-practices --skill api-endpoint
Clone the repo
git clone --depth 1 https://github.com/berkcangumusisik/claude-code-practices

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.

agentmods badge for api-endpoint

README.md
[![agentmods](https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/api-endpoint.svg)](https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/api-endpoint)
Your own site
<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/api-endpoint"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/api-endpoint.svg" alt="Measured on agentmods" height="20"></a>
Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 277 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00019 $0.00277
Opus 5 $0.00010 $0.00138
Sonnet 5 $0.00004 $0.00055
Haiku 4.5 $0.00002 $0.00028

Measured 5d ago against content hash c8916a16d3c5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-endpoint 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 5d 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-endpoint/SKILL.md · 39 lines

What it actually says

Generate API Endpoint

Method + Path: $1 $2 Description: $3

  1. Detect framework:
cat package.json | grep -E '"express"|"fastify"|"hono"|"koa"|"nestjs"'
ls src/routes/ src/api/ src/handlers/ 2>/dev/null | head -10
  1. Read 1-2 existing route files to match patterns exactly.

  2. Generate the route handler with:

    • Request validation (Zod schema or project's validator)
    • Auth middleware call (if project uses auth)
    • Business logic (stub with TODO if complex)
    • Proper error handling (use project's error classes)
    • Typed request/response
  3. Register the route in the router file.

  4. Generate tests:

    • Happy path (200/201)
    • Validation error (400)
    • Auth error (401/403)
    • Not found (404) if applicable
  5. Update API docs if docs/api.md or OpenAPI spec exists.

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. 5d ago First seen · 39 lines · 19 tokens per session scan A c8916a16d3c5

Subscribe to this mod's changes

api-endpoint is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 19 tokens to every session and 277 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 2026-08-31.

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