Rewind a chat to an earlier point in the conversation

Truncates the chat's in-memory turns to keep only the first keep_turns user/assistant turns (ellmer counts each user and assistant message as a separate turn, so a "round" is 2 turns). This is a pure in-memory operation via Chat$set_turns(); persist afterwards with save_session() to make the rewind durable.

Usage

truncate_chat_turns(chat, keep_turns)

Arguments

chat

An ellmer::Chat object (modified in place).

keep_turns

Integer. Number of turns to keep from the start. If NULL or larger than the current turn count, nothing is truncated.

Value

Invisibly the number of turns kept.