Module external_engine 

Register and use an external engine: a chess engine running on the user’s own machine, made available for cloud analysis (e.g. from the Lichess analysis board) via a provider/secret handshake.

Listing, creating, fetching, updating, and deleting engine registrations (list_external_engines, create_external_engine, get_external_engine, update_external_engine, delete_external_engine) require a bearer token with the engine:read or engine:write scope and talk to the regular Lichess host. Requesting and providing analysis (analyse_with_external_engine, acquire_analysis_request, submit_analysis) instead use the engine’s own client/provider secrets for auth and are served from a separate host, Domain::Engine.