api-route

A step-by-step guide for building an HTTP API endpoint, which is a URL that software uses to exchange data.

In plain words
What is it for?
Use it when designing or implementing routes that authenticate users, validate requests, query a database, and return results. It also lists checks and tests for common success and failure cases.
Why use it?
It helps avoid missing security checks, invalid input handling, safe database queries, and consistent error responses.

Command for Claude Code

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 commands/codeverbojan/claude-code-kickstart/api-route
Clone the repo
git clone --depth 1 https://github.com/codeverbojan/claude-code-kickstart

Made for: Claude Code.

Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 280 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 $0.00015 $0.00280
Opus 5 $0.00008 $0.00140
Sonnet 5 $0.00003 $0.00056
Haiku 4.5 $0.00002 $0.00028

Measured yesterday against content hash f94a0dc00207, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-route 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 yesterday.

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.

.claude/commands/api-route.md · 37 lines

What it actually says

API Route Playbook

1. Design

  • HTTP method + path
  • Request schema (what fields, what types, what's required)
  • Response schema (success + error shapes)
  • Auth requirement (public, authenticated, admin-only)

2. Build

Follow this order in the handler:

  1. Auth check — verify session/token, check role
  2. CSRF check — on mutations (POST, PUT, DELETE)
  3. Input validation — parse with schema (Zod, joi, Pydantic, etc.)
  4. Business logic — parameterized queries only, never interpolate input
  5. Response — proper status codes, consistent error shape

3. Security Checklist

  • Auth on the endpoint
  • Input validated server-side
  • No secrets in response
  • Parameterized DB queries
  • Rate limiting considered
  • Error messages don't leak internals

4. Verify

  • Run type-checker
  • Run linter
  • Write/run tests for: happy path, validation error, auth failure, not found
  • Consider using the security-reviewer agent for a deep audit.

$ARGUMENTS

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. yesterday First seen · 37 lines · 15 tokens per session scan A f94a0dc00207

Subscribe to this mod's changes

api-route is a command published in the GitHub repository codeverbojan/claude-code-kickstart (2 stars, last pushed 4mo ago), licensed MIT. It adds 15 tokens to every session and 280 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.