What probably matters to youSection of the release
Unclear What functionality the 'responsive-mode' chunk provides is not stated in the evidence.
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.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat functionality the 'responsive-mode' chunk provides is not stated in the evidence.
