Turning Fast mode on now runs your model-switch hook and can be refused.
What's wrong with this entry?
Turning Fast mode on or off, from /config, /fast or the fast-mode picker, now checks for in-flight turns and runs your PreModelSwitch hook against the model it would move to. If the hook denies it or answers "ask", fast mode stays off and you get an error telling you to run /model to switch first, then enable fast mode. This used to be an immediate state flip with no checks.
- The toggle now shows a cancellable "Applying fast mode…" / "Waiting for the workspace…" state while the hook runs.
- If the model changes underneath the hook, the toggle is abandoned with a message asking you to try again.
- The fast mode option itself only appears when its own two internal checks pass.
Fast mode was not enabled: the model changed while PreModelSwitch hooks ran; try again, Model switch blocked by a PreModelSwitch hook
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
-
v2.1.234
Startup model-config prefetch, switched off
Both mention config
-
v2.1.234
Per-model token limits fetched from the API
Both mention config
-
v2.1.239
Remote Control bridge sessions reject foreign --mcp-config entries
Both mention config