Use when ingesting, refreshing, listing, searching, or deleting a local corpus with Blackbird code search and `gh blackbird search --fileset`.
Use when reaching for `gh blackbird` (Blackbird code search) for cross-repo lexical, symbol, or semantic search on GitHub — finding callers, ownership, or how systems work without cloning.
Use when creating a GitHub pull request, or when updating an existing PR's title or body so it matches what the code actually does.
Use when authoring or substantially editing a design doc, architecture doc, or subsystem explanation — the "here's what's there and why" companion to an ADR's terse decision record.
Use when creating a repo-tracked multi-agent planning PR for a large project, especially when phases, living docs, parallel agent prompts, and cross-PR coordination are needed.
Use when about to call a library, crate, or framework API you haven't verified, when a dependency's behavior is surprising, when training-data memory might be stale, or when investigating how a dependency actually behaves.
Use when investigating an alert, monitor, incident, error spike, degraded service, or production anomaly, and the repository has no incident-investigation skill of its own.
Use when deciding which workflow or skill should handle a task, especially when repo-local, dotfiles, process, and app-native workflows may overlap.