A default naming a route the Models page has since removed left the composer saying 选择模型 while the input still accepted a message, which then failed inside the adapter mid-turn. `session.prompt` now refuses with `model-unavailable` before opening a turn. That is the enforcement boundary: the method stays callable no matter what a client disables. `session.models` reports the same fact as `routable`, and ui-model pushes a block through the new `ctx.conversation.blocks` registry so the bar renders the disabled textarea it already renders without a workspace, carrying the blocker's own reason. The push direction is forced — ui-model already depends on ui-conversation, so ui-conversation cannot read it back. The gate is `routable`, not "matches no advertised group": catalog membership is advisory, so a route serving a model it stopped advertising is missing from the groups yet perfectly usable, and `null` before the first load never blocks so a slow Host cannot lock a working composer. The scaffold gains a route-only adapter for fixture-less keyless scenarios. Registering zero providers is a test artifact — every product composition mounts one — and the goldens that froze the seat's fallback label now show the model those scenarios actually route to.
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- banner:
- navigation "Session hierarchy":
- button "Inline code links" [disabled]
- tablist:
- tab "Chat" [selected]
- tab "Trajectory"
- navigation "Session hierarchy":
- text: Show the local preview URL. {{clock}}
- button "Copy":
- img
- heading "Inline code links" [level=2]
- paragraph:
- text: "Preview:"
- code:
- link "{{linkUrl}}":
- /url: {{linkUrl}}
- link "{{linkUrl}}":
- paragraph:
- text: "Standard:"
- link "Open preview":
- /url: {{linkUrl}}
- paragraph:
- text: "Command:"
- code: curl {{linkUrl}}
- paragraph:
- text: "Unsafe:"
- code: javascript:alert(1)
- paragraph: INLINE_CODE_LINK_DONE
- button "Copy":
- img
- button "Branch into a new conversation":
- img
- text: {{clock}} Ran for {{duration}}
- textbox "Message the agent"
- button "Commands":
- img
- 'button "Access mode, current: Workspace Write"': Workspace Write
- button "Select model, current DeepSeek-V4-Flash":
- text: DeepSeek-V4-Flash
- img
- button "Send message" [disabled]
- text: 1 turns · 1 steps LLM {{duration}} Input 0 tok · Output 0 tok