pi-mono Deep Dive 4: Agent Loop — Double-Loop & Event Flow, From Steering to Follow-up Complete Timeline
Heart of pi-agent-core: agentLoop() → runLoop() double while(true). Inner loop handles tool calls + steering messages; Outer loop handles follow-up + prepareNextTurn (compaction, model switch). Enter = steering (inject after current tool), Alt+Enter = follow-up (inject after agent stops). streamAssistantResponse() partial message updates, tool call parsing, parallel/sequential execution, before/after hooks.