Pi 0.17.0

Changed

• Simplified compaction flow: Removed proactive compaction (aborting mid-turn when threshold approached). Compaction now triggers in two cases only: (1) overflow error from LLM, which compacts and auto-retries, or (2) threshold crossed after a successful turn, which compacts without retry.

• Compaction retry uses Agent.continue(): Auto-retry after overflow now uses the new continue() API instead of re-sending the user message, preserving exact context state.

• Merged turn prefix summary: When a turn is split during compaction, the turn prefix summary is now merged into the main history summary instead of being stored separately.

Added

• isCompacting property on AgentSession: Check if auto-compaction is currently running.

• Session compaction indicator: When resuming a compacted session, displays "Session compacted N times" status message.

Fixed

• Block input during compaction: User input is now blocked while auto-compaction is running to prevent race conditions.

• Skip error messages in usage calculation: Context size estimation now skips both aborted and error messages, as neither have valid usage data.