deepagents 0.7.12, released 2026-09-01, adds subagent conversation forking to the SDK, letting a subagent branch from an existing conversation state rather than starting fresh. The release also tolerates a missing `modified_at` field in glob sort. Forking matters for anyone fanning out parallel subagents from a shared investigation: it removes the choice between re-sending the full parent context to each child and starting each child blind.