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Core Rules

Universal rules for any project. Add to CLAUDE.md or use as reference.

Quality

Run lint/typecheck before commit
Test affected code
No console.log in production
No hardcoded secrets

Git

Atomic commits
Descriptive messages
Feature branches, not main
Review before push

Context

Read before edit
Plan before multi-file
Compact at milestones
<10 MCPs enabled

Learning

Capture corrections: [LEARN] Category: Rule
Update LEARNED.md
Patterns compound over time

Communication

Concise > verbose
Action > explanation
Ask when unclear
Acknowledge mistakes

Performance

Haiku for quick tasks
Sonnet for features
Opus for architecture
Opus+Thinking for hard bugs

Claude Code Mastery

Docs: https://code.claude.com/docs/

Use plan mode for multi-file changes
Write CLAUDE.md with structure, conventions, rules
Manage context: /compact at task boundaries, /context to check usage
Prompts need scope + context + constraints + acceptance criteria
Build skills for repeated workflows (>3 repetitions)
Delegate to subagents for parallel exploration
Keep <10 MCPs, <80 tools
Use hooks for automated quality gates
Review security model before handling sensitive data
See references/claude-code-resources.md for full guide