api-routes

Rules for building API routes in Next.js, a JavaScript framework for web applications. They cover request and response handling and common error patterns.

In plain words
What is it for?
Implementing and reviewing Next.js API routes, including their requests, responses, and error handling.
Why use it?
They give developers consistent guidance for how API endpoints receive data, return results, and report errors.

Cursor rule for Cursor

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 rules/kevinsuh/agentic-coding-workshop/api-routes
Clone the repo
git clone --depth 1 https://github.com/kevinsuh/agentic-coding-workshop

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,014 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.01014
Opus 5 $0.00000 $0.00507
Sonnet 5 $0.00000 $0.00203
Haiku 4.5 $0.00000 $0.00101

Measured yesterday against content hash f8ba32cd6567, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-routes scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Use curl or fetch from browser console:
.cursor/rules/api-routes.mdc · 199 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

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 · 199 lines · 0 tokens per session scan A f8ba32cd6567

Subscribe to this mod's changes

api-routes is a cursor rule published in the GitHub repository kevinsuh/agentic-coding-workshop (2 stars, last pushed 7mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,014 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.