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code-understand

Map the load-bearing files, symbols, callers, and dependencies of an unfamiliar codebase before making changes. Use for architecture orientation, impact analysis, what-would-break questions, or finding callers. Uses CodeGraph when available and a dependency-free builtin fallback.

skills/code-understand/SKILL.md

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# Code Understand — On-Demand Architecture Focus Map

You are about to work in a codebase you don't fully know yet. Instead of grepping around or
reading files at random, ask the local extractor for a **focus map**: the ranked symbols the
architecture hangs on, each with a `file:line` citation and evidence type. Read only what it
points at — this is a map, not a substitute for reading the actual code it cites.

## When to reach for this

- Before editing an unfamiliar module — see what calls it and what it calls before changing
  its shape.
- The user asks "how does X work", "what's the impact of changing Y", "who else uses this
  function" for a codebase, not the wiki.
- You're about to do a large refactor and want a ranked list of load-bearing files instead of