Lottery-Tracker/SKILLS/30-implementation-rules.md

Implementation Rules

Change policy

• Prefer edits over rewrites.
• Keep changes localized.
• One change = one purpose.
• Avoid unnecessary abstraction.

Dependency policy

• Default: do not add dependencies.
• If adding: explain why, alternatives considered, and impact.

Error handling

• Validate inputs at boundaries.
• Error messages must be actionable: what failed + what to do next.