Feature Deep Dive

Build debug-grade understanding of one feature or subsystem. Do not change code unless the user asks.

One responsibility: make a developer understand one area well enough to debug/change it without guessing.

Scope

Choose one vertical slice or subsystem only: invite claim, promotion scheduling, content generation callback flow, search ranking, billing checkout, etc.

If the user needs the whole-system map first, use rebuild-mental-model. If this trace changes the global model, update or hand off to rebuild-mental-model.

Output

Follow repo conventions first. If none exist, create/update:

• docs/feature-deep-dives/<feature-slug>.md
• CONTEXT.md if domain language changes and it exists; otherwise docs/ubiquitous-language.md