Agents asking "is this function used?" get resolved, unknown, or
unreferenced per function instead of a bare zero in-degree. Unknown lists
why callers may exist: same-name unresolved call sites (excluding foreign
receivers and macros), name references (callbacks, address-taken, macro
bodies), virtual/trait-impl/external-base/outside-class members, framework
attributes, implicit protocol invocations, entry points, test code,
incomplete parses, and, unless assume_closed_world is set, exported or
external-linkage functions. Unreferenced is a review candidate with an
explicit heuristic/compiler evidence basis, never a dead-code proof.
The queries are read-only over validated schema-4 models and return
complete canonical nodes and edges plus metrics.resolution coverage.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
