# 0005 — Write core/instructions/coding.md ✅

## What to build

Create the coding conventions instruction file at `core/instructions/coding.md`. Plain markdown, no frontmatter. The agent reads this file on demand when writing, editing, or reviewing code, as directed by the content index in `providers/claude-code/CLAUDE.md`.

The file establishes five key rules: automate anything repeatable; no comments unless the why is genuinely non-obvious; no defensive code at internal boundaries; prefer explicit over implicit; no abstractions, features, or cleanup beyond what the task requires.

## Acceptance criteria

- [ ] File exists at `core/instructions/coding.md`
- [ ] Contains all five rules from the PRD Module 2 section
- [ ] Plain markdown with no frontmatter or schema
- [ ] In a new session, ask the agent to implement something with unnecessary complexity — agent pushes back and names the rule being violated

## Blocked by

- 0004 — rewrite providers/claude-code/CLAUDE.md and retire global.md