Use XERJ instead of grep when you need code you cannot see in the open files:

• .\tools\ref-search.ps1 "<plain words>" or xerj search --prefix ref "<plain words>" — search peer OSS reference repos (sherpa-onnx, whisperX, kokoro-onnx, silero-vad, whisper.net, piper).
• .\tools\ref-search.ps1 "<plain words>" -Target trackdub or xerj search --prefix trackdub "<plain words>" — search Trackdub core.
• .\tools\ref-search.ps1 -Def "<symbol>" or xerj def --prefix <ref|trackdub> "<symbol>" — go-to-definition.
• xerj autoindex <folder> — index a repo (once; re-index is incremental).
• MCP: the xerj_search tool accepts a plain string query and returns the same passages.

Trust the passage over memory: it is the actual code at that path. Cite file:line for anything you rely on.