Claude Code adds forked subagents

Forking agent execution threads with inherited context represents the missing architectural link for practical developer tooling, proving that intelligent cache reuse matters just as much as model intelligence.

• –Eliminates context amnesia: Background tasks inherit accumulated decisions, constraints, and file discoveries without requiring manual prompt engineering or redundant re-indexing.
• –Makes multi-agent economics practical: Reusing the parent context prefix with prompt caching avoids the massive token bills typically incurred by spin-up-heavy agent frameworks.
• –Safe speculative branching: Engineers can fire off parallel experiments, alternative architectural fixes, or unit test sweeps without polluting or blocking their primary interactive terminal loop.
• –Streamlined developer experience: Triggering branches via a lightweight `/fork` command gives developers fine-grained control over concurrency without the overhead of complex multi-agent orchestrators.