# Backend Standards

> Detailed backend patterns and code examples for server implementation. Use when you need step-by-step guidance or concrete code patterns beyond what the auto-loaded backend rules provide.

- Skill: `ms2sato/backend-standards` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add ms2sato/backend-standards`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ms2sato/backend-standards/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ms2sato (https://skillmd.com/u/ms2sato)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/ms2sato/backend-standards

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# Backend Standards (Procedural Guide)

> **Note:** Declarative rules (conventions, directory structure, naming) are in `.claude/rules/backend.md` and auto-loaded for `packages/server/**`. This skill provides detailed code examples and patterns.

## Detailed Documentation

- [backend-standards.md](backend-standards.md) — procedural detail and code patterns beyond the rule: Dependency Injection Policy, Hono framework patterns (routes, Valibot validation, error handling), structured logging examples, async patterns (route handlers, callbacks, process-level), callback lifecycle, resource cleanup worked example, PTY output buffering, async-over-sync exceptions and examples, WebSocket message typing.
- [websocket-patterns.md](websocket-patterns.md) — WebSocket implementation details: dual architecture setup, message protocol types, broadcast implementation, output buffering.
- [webhook-receiver-patterns.md](webhook-receiver-patterns.md) — webhook receiver implementation: always-200 pattern, async processing, signature verification, error handling strategy.