Activate when creating new modules, refactoring class hierarchies, introducing design patterns, or making changes spanning 3+ files in the APM CLI codebase.
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---
name: python-architecture
description: >
Activate when creating new modules, refactoring class hierarchies, introducing
design patterns, or making changes spanning 3+ files in the APM CLI codebase.
---
# Python Architecture Skill
[Python architect persona](../../agents/python-architect.agent.md)
## When to activate
- Creating new Python modules or packages under `src/apm_cli/`
- Refactoring class hierarchies or introducing base classes
- Changes that touch 3+ files with shared logic patterns
- Introducing new design patterns (Strategy, Observer, etc.)
- Cross-cutting concerns (logging, auth, error handling)
- Performance-sensitive paths (parallel downloads, large manifests)
## Key rules
- Follow existing patterns (BaseIntegrator, CommandLogger, AuthResolver) before inventing new ones
- Prefer composition over deep inheritance
- Push shared logic into base classes, not duplicated across siblings
