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Keep the requirement beside the code

Download the focused rule for a recurring agent mistake, review its selector, and run the same check after the edit and the repair. Each pack preserves your existing perch.yaml and links to its implementation and captured controls.

FastAPI

Build a FastAPI endpoint that keeps discount limits intact · 1 rule
Keep a FastAPI order update and its outbox event in one transaction · 1 rule
FastAPI · 3 rules
Preserve tenant authorization inside an atomic FastAPI update · 1 rule

Django

Create a Django outbox event atomically with the order change · 1 rule
Build a Django update that sends notifications after commit · 1 rule
Django · 3 rules
Keep Django cancellation writes scoped to the authenticated tenant · 1 rule

Next.js

Build a Next.js redirect route that stays on your origin · 1 rule
Prevent private Next.js order responses from entering shared caches · 1 rule
Next.js · 3 rules
Authorize a Next.js Server Action at the database write · 1 rule

Express

Build an Express API that caps discounts before calculation · 1 rule
Express · 3 rules
Return the PostgreSQL client after every Express transaction outcome · 1 rule
Reserve stock in Express with one conditional database update · 1 rule

Rails

Build a Rails update that keeps privileged fields out of agent edits · 1 rule
Serialize Rails stock reservations with an Active Record row lock · 1 rule
Reject stale Rails cancellation decisions with optimistic locking · 1 rule
Rails · 3 rules

Laravel

Dispatch Laravel order jobs only after the transaction commits · 1 rule
Use a conditional Laravel update to prevent overselling · 1 rule
Build Laravel authorization that preserves record ownership · 1 rule
Laravel · 3 rules

Flask

Keep Flask request connections from leaking on error paths · 1 rule
Flask · 2 rules
Deduplicate a signed Flask webhook inside its state transaction · 1 rule

Fastify

Keep Fastify permission hooks inside the protected plugin · 1 rule
Fastify · 2 rules
Keep Fastify reservation and order writes on the same transaction client · 1 rule

Hono

Enforce Hono JWT permissions after verification and before mutation · 1 rule
Hono · 2 rules
Persist a Hono notification record before post-response dispatch · 1 rule

Symfony

Keep Symfony inventory and order writes on one Doctrine transaction · 1 rule
Keep Symfony object authorization before the order write · 1 rule
Symfony · 2 rules

Spring Boot

Require Spring method security before a scoped order mutation · 1 rule
Spring Boot · 2 rules
Keep Spring order confirmation and its outbox write under one proxy transaction · 1 rule

Ktor

Apply backpressure to Ktor background work with a bounded coroutine channel · 1 rule
Preserve Kotlin coroutine cancellation in a Ktor service · 1 rule
Ktor · 2 rules

Gin

Keep Gin’s pooled context out of the background queue · 1 rule
Keep Gin reservation and order creation on database/sql’s transaction handle · 1 rule
Gin · 2 rules

Echo

Prevent privileged-field binding in an Echo profile mutation · 1 rule
Carry Echo cancellation through to the database query · 1 rule
Echo · 2 rules

ASP.NET Core

Return a conflict when EF Core detects a stale order edit · 1 rule
Authorize the loaded ASP.NET Core order before saving changes · 1 rule
ASP.NET Core · 2 rules

Phoenix

Keep Phoenix order and audit changes in one Ecto.Multi · 1 rule
Insert an Oban job in the same transaction as the Phoenix order change · 1 rule
Phoenix · 2 rules

React

Serialize and roll back an optimistic React cancellation · 1 rule
React · 2 rules
Keep old React search responses from replacing the current query · 1 rule

Vue

Vue · 2 rules
Dispose Vue realtime subscriptions when the owner disappears · 1 rule
Cancel and invalidate Vue watcher requests before the next await · 1 rule

Angular

Angular · 2 rules
Cancel obsolete Angular HttpClient searches with switchMap · 1 rule
Keep Angular form extras out of the profile mutation payload · 1 rule

SvelteKit

Keep SvelteKit private SSR responses out of shared caches · 1 rule
SvelteKit · 2 rules
Authorize a SvelteKit form action before its conditional write · 1 rule

Nuxt

Use Nuxt request-scoped state instead of a shared SSR ref · 1 rule
Nuxt · 2 rules
Keep Nuxt API mutations scoped to the server-verified session · 1 rule

NestJS

Keep NestJS event persistence on the supplied TypeORM transaction manager · 1 rule
NestJS · 2 rules
Reject unlisted NestJS mutation fields at the validation pipe · 1 rule

Axum

Stop an Axum worker while it waits for queued input · 1 rule
Axum · 2 rules
Keep Axum’s verified tenant inside the SQLx order update · 1 rule

Actix Web

Bound Actix import input before scheduling blocking work · 1 rule
Keep Actix order reads scoped by ReqData identity · 1 rule
Actix Web · 2 rules

Qt

Dispose Qt network replies after their completion signal · 1 rule
Qt · 2 rules
Protect Qt’s shared stock decision with one scoped mutex · 1 rule

Vapor

Keep Vapor’s order and audit writes on the Fluent transaction database · 1 rule
Vapor · 2 rules
Observe Swift task cancellation between bounded order-processing steps · 1 rule

Flutter

Reject stale Flutter search results after a newer query or disposal · 1 rule
Cancel Flutter timers and streams when the screen is disposed · 1 rule
Flutter · 2 rules

Shiny

Shiny · 2 rules
Check Shiny session authorization inside the write observer · 1 rule
Remove Shiny’s session-owned temporary files on session end · 1 rule

http4s

Release http4s response resources after success or decoding failure · 1 rule
Keep a doobie reservation and order insert in one transaction · 1 rule
http4s · 2 rules

Ring

Ring · 2 rules
Keep Ring mutation permissions at the request handler · 1 rule
Release Clojure file resources when parsing an order fails · 1 rule

OpenResty

OpenResty · 2 rules
Protect OpenResty stock decisions across workers with a shared lock · 1 rule
Do not acknowledge OpenResty background work before timer admission · 1 rule

POSIX services

Preserve complete POSIX writes when appending an order record · 1 rule
Close a POSIX file descriptor even when synchronization fails · 1 rule
POSIX services · 2 rules