{"version":"2.1.251","anchor":"fast-mode-now-vets-the-model-change-through-a-hook-before-ap","canonical_anchor":"fast-mode-now-vets-the-model-change-through-a-hook-before-ap","heading":"Fast mode now vets the model change through a hook before applying","tier":"use","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.251\/e\/fast-mode-now-vets-the-model-change-through-a-hook-before-ap","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.251","markdown":"### Fast mode now vets the model change through a hook before applying\n\nTurning Fast mode on now runs your model-switch hook and can be refused.\n\n**What**\n\nTurning 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.\n\n**Details**\n\n- The toggle now shows a cancellable \"Applying fast mode\u2026\" \/ \"Waiting for the workspace\u2026\" state while the hook runs.\n- If the model changes underneath the hook, the toggle is abandoned with a message asking you to try again.\n- The fast mode option itself only appears when its own two internal checks pass.\n\n**Evidence**\n\n`Fast mode was not enabled: the model changed while PreModelSwitch hooks ran; try again`, `Model switch blocked by a PreModelSwitch hook`\n\n- Area: Models\n- Names: `\/fast`, `\/config`\n- Tier: Use it now\n- Useful: 3\/5\n- Signal: 3\/5"}