api

You are an expert TypeScript backend engineer specializing in building modern, type-safe APIs. Your expertise covers Hono for HTTP routing, Drizzle ORM for database operations, and React Query for frontend integration.

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/sullyo/webapp-starter/api
Clone the repo
git clone --depth 1 https://github.com/sullyo/webapp-starter

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 2,260 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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.02260
Opus 5 $0.00000 $0.01130
Sonnet 5 $0.00000 $0.00452
Haiku 4.5 $0.00000 $0.00226

Measured today against content hash 5c6de97ab57b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api 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 today.

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.

.cursor/rules/api.mdc · 298 lines

How it starts

The opening of the file, as written. The whole thing — 298 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Backend API Architecture and Development Guidelines

You are an expert TypeScript backend engineer specializing in building modern, type-safe APIs. Your expertise covers Hono for HTTP routing, Drizzle ORM for database operations, and React Query for frontend integration.

<core_architecture>

<tech_stack>

  • Server & Routing: Hono
  • Database ORM: Drizzle with PostgreSQL
  • Frontend Integration: React Query
  • Authentication: Clerk
  • Validation: Zod with zValidator </tech_stack>

<project_structure> apps/ ├── api/ │ ├── src/ │ │ ├── modules/ # Feature-based modules │ │ │ ├── [module]/ # e.g., posts, webhooks │ │ │ │ ├── [module].routes.ts # Route definitions │ │ │ │ └── [module].service.ts # Business logic & DB operations │ │ ├── pkg/ # Shared utilities and middleware │ │ └── index.ts # Main application setup └── web/ └── src/ └── api/ └── [module].api.ts # React Query hooks

packages/ └── db/ ├── src/ │ ├── schema.ts # Database schema definitions │ ├── types.ts # Shared TypeScript types │ ├── index.ts # Main exports │ └── util/ # Database utilities </project_structure>

<module_development_guidelines>

1. Database layer

  • If the request needs a new column or addition database fields start by creating and updating schema.ts
  • Leverage types.ts inside packages/db to create new zod schemas for the newly created tables or columns and eg:
export type Post = InferSelectModel<typeof schema.posts>;
export type NewPost = InferInsertModel<typeof schema.posts>;

export const postInsertSchema = createInsertSchema(schema.posts).omit({ userId: true });
export const postSelectSchema = createSelectSchema(schema.posts);

2. Service Layer ([module].service.ts)

  • Implement business logic
  • Handle database operations using Drizzle
  • Return strongly typed responses
  • Keep services focused and modular
  • Import db from the packages/db

Read the full file on GitHub · 298 lines

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. today First seen · 298 lines · 0 tokens per session scan A 5c6de97ab57b

Subscribe to this mod's changes

api is a cursor rule published in the GitHub repository sullyo/webapp-starter (869 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,260 tokens. 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 2026-09-01.