Module session

Structs§

CheckpointState: Boundary recorded by the checkpoint tool for a later rewind.
CompactOutcome: Outcome of Session::compact for autocompact circuit breakers.
Session: A conversation session
SessionCost: Running USD estimate. Steps whose model has no known price are counted, not guessed.

COMPACT_CONTINUATION_PREAMBLE: Preamble prepended to the post-compact summary carrier (full-replace).
SPILL_HEAD_CHARS: What stays in the transcript when an old tool body is spilled to disk: this many leading chars, then a pointer line. Under the shake cap, so neither prune nor shake cuts the pointer away.
SPILL_MARK: Marks a spilled body; a body that carries it is not spilled again.
TOOL_RESULT_MAX_CHARS: Soft cap on tool result bodies kept in the transcript (Unicode scalars).
TOOL_RESULT_PRUNE_CHARS: Cap for older tool results during compact (prune to ~2k chars). Recent tool dumps stay at TOOL_RESULT_MAX_CHARS so the model can still use the last step’s output; older steps shrink hard for TTFT.
TOOL_RESULT_SHAKE_CHARS: Harder shake when the session is still over ~¾ of the compact threshold.

compact_summary_display_text: Human-facing compact card: drop the model preamble, keep the summary body.
default_system_prompt: Default system prompt for the main agent
format_compact_summary: Clean a compaction-model reply into a plain summary body.
format_compact_summary_content: Continuation carrier that replaces compacted history (full-replace).
is_compact_summary_text: True when a user message is a compact stub, not a real user turn.