codebase-aware

2 questions

AI

What does Claude Code do when adding a feature that touches a previously-fixed bug surface?

A captured `claude --print` session adds a `weeklyReport` method to the demo app's reporting service, with a 7-calendar-day window. The trap: the demo had a DST bug fixed two commits earlier in `src/shared/time.ts`. Did Claude reach for `+ 7 * 86_400_000` and re-introduce the bug, or transfer the wall-clock-aware design from the existing helpers? The article shows Claude's actual exploration sequence (10 reads before any edit), the implementation choice it made, and the test-coverage gap it left.
AI

What does Claude Code's skill auto-invocation actually look like in a real session?

A captured `claude --print` session against the demo app, with a `booking-conventions` skill defined at `.claude/skills/booking-conventions/SKILL.md`. The prompt mentioned bookings without mentioning the skill. The events.jsonl init event listed the skill in its `skills` array; Claude's first tool call was `Skill({skill: 'booking-conventions'})`, which loaded the full convention content into the session before any reads or edits. The implementation that landed honored the skill's status state machine and lexical-sort guidance without those rules ever appearing in the prompt.