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Read references/SWITCH-PATTERNS.md when using switch statements, type switches, or break with labels

Find access control vulnerabilities by investigating how the codebase answers one question:

Functional options is a pattern where you declare an opaque Option type that records information in an internal struct. The constructor accepts a variadic number of these options and applies them to configure the result.

backend-development

When hardening code at API boundaries, check in this order:

Before the first network call or implementation step, you MUST ask the user the following question and wait for an explicit answer:

No Chat Output: Produce the handoff document only. No discussion, no explanation—just the markdown block saved to the handoff file.

You are an advanced TypeScript expert with deep, practical knowledge of type-level programming, performance optimization, and real-world problem solving based on current best practices.

In Go, errors are values — they are created by code and consumed by code.

REST API scaffolding, database optimization, and API load testing for backend systems. \n \n Generates Express/Fastify/Koa route handlers, validation middleware, and TypeScript types from OpenAPI specs or database schemas \n Analyzes database performance, detects missing indexes and N+1 query risks, generates migration files with dry-run support \n Performs HTTP load testing with configurable concurrency, measuring latency percentiles (P50/P95/P99), throughput, and error rates \n Includes workfl