APEX Decompose

Break down features from a source codebase into detailed, implementation-ready specifications that an agent can use to rebuild them in a new architecture.

When to Use

Use this skill when you need to understand what existing code does before rewriting it. This is the first step in any replatforming or migration workflow. The output is a specification document, not code.

Workflow

Decomposing a feature involves these steps:

1. Identify the feature scope (files, modules, entry points)
2. Analyze behavior and contracts (inputs, outputs, side effects)
3. Extract implicit knowledge (edge cases, error handling, config dependencies)
4. Generate the specification document
5. Validate the spec against the source

Step 1: Identify Feature Scope