v2.2.0

Features

• api: add support for message threads
• api: add usage and cost reports by dimension, mark older reports legacy

Bug Fixes

• tools: a tool runner whose messages are replaced while a reply is handled skips that turn again: no tool runs and the next request sends the new messages as they are
• tools: the tool runner takes a frozen messages array again when no tool is called
• tools: the assistant turn that the tool runner adds to params[:messages] can be edited again, and its blocks other than tool calls are typed blocks again

Chores

• ci: update the runner label for internal CI jobs
• docs: clarify plugin content scan and validation descriptions
• docs: clarify plugin served_version_pinned and updated_at
• docs: fix usage and cost report examples and ending_at docs
• docs: rate limit model lists vary by organization and workspace