Context and TurnContext

Context is injected into tool functions annotated with the bare Context class. It exposes the actor ID, turn ID, call ID, depth, per-turn dependencies, store, memory, and durable emit and live root-only ask operations.

TurnContext is the hook and prompt context. Runtime populates history, resolved model, provider limits, provider, tracer, dependencies, and the current actor header. History is complete by default. With Runtime(history_mode="compacted"), it contains the latest CompactionApplied marker and the retained event window. Before compaction it also holds sample_request, the complete prepared SampleRequest including prompt blocks, execution environment, messages, tools, and parameters.

Actor coordination is model-visible through Runtime’s injected spawn, status, send, and finish tools rather than methods on Context.

Both contexts expose submitted_by, taken from the accepted input command. It defaults to None for legacy and internal actor inputs. Applications may use it for audit or execution checks; Runtime does not treat it as authorization or automatically include it in the model request.