What probably matters to youSection of the release
What
A new built-in plugin named responsive-mode makes Claude reply with a short acknowledgment before thinking or calling any tool, on every prompt. It injects a '# Responsive mode' section into the system prompt and uses prompt.submit/turn.abort hooks (hooks are pieces of code that run at specific points in a turn) to abort and redirect the turn so the acknowledgment goes out first.
A new lazy-loaded 'responsive-mode' bundle chunk (a piece of code loaded on demand rather than upfront) is registered alongside the existing 'diff' chunk, loaded under the same conditions (non-local-agent entrypoint).
Why
This gives users faster visible feedback that Claude has received a prompt, before it starts any longer thinking or tool use.
