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 reading the whole tree.
• You already have a diff or a set of changed files and want to know their blast radius before finishing the change.

Not for: summarizing what a project does for the wiki (that's wiki-update Step 3b, which calls this same command as part of a bigger sync flow), use this skill directly only when you need the focus map for your own immediate work, not to persist knowledge.

Running it

obsidian-wiki code-understand --project <dir> [--backend auto|builtin|codegraph] \
    [--changed <file>...] [--since <sha>] [--max-symbols N] [--pretty]