Buck2 Target Determination

Overview

Target determination identifies which Buck2 targets are affected by code changes between two jj revisions. This enables incremental workflows that only build/test what changed, dramatically reducing build times (often 10-100x faster than full builds).

When to Use This Skill

Use this skill when:

• User wants to "test what changed" or "test my changes"
• User asks to "build only affected targets"
• User requests "incremental build/test"
• Setting up CI/CD workflows that should only test affected code
• Analyzing impact of changes before committing
• User mentions quicktd or target determination

How Target Determination Works