Claude Code System Prompts

@internal One leg of a tool call this session forwards to the attached machine that announced it serves the tool: the first leg, the approval leg (envelope.approval), a detached decline, or an outcome query (envelope.op = 'outcome_of'). Answered with a control_response whose success payload is the served CallToolResult; cancelled with control_cancel_request. An error-shaped control_response is not an answer (an older attached client error-replies subtypes it does not know); the worker keeps waiting.