[DOCS] Fast-mode docs omit the announcement when model switching changes fast mode

Documentation Type

Missing documentation (feature not documented)

Documentation Location

https://code.claude.com/docs/en/fast-mode

Section/Topic

“Toggle fast mode,” especially the user-visible state changes caused by /config model=<x> and Remote Control.

Current Documentation

The page currently says:

When you enable fast mode: ... You'll see a confirmation message: “Fast mode ON”

It also says that switching to an unsupported model turns fast mode off and that switching back can turn it on again, but it does not describe the announcement shown when a model switch changes fast-mode state.

What's Wrong or Missing?

Claude Code 2.1.218 added an announcement when fast mode changes because the user switched models through /config model=<x> or Remote Control.

The current page documents the state transition but not the announcement that tells the user why the state changed. Users controlling a session from the configuration command or another device can therefore see the fast-mode icon change without knowing whether the change came from their model selection or from a separate fast-mode setting.

Suggested Improvement

Add a versioned note to the model-switching paragraph explaining that /config model=<x> and Remote Control announce when the model switch turns fast mode on or off. Include the wording or a representative example of the announcement, and clarify that this is in addition to the normal Fast mode ON confirmation shown when /fast is used.

Cross-link the same note from the model configuration and Remote Control pages.

Impact

Medium - Makes feature difficult to understand

Additional Context

Affected Pages:

| Page | Context |
|------|---------|
| https://code.claude.com/docs/en/fast-mode | Fast-mode state and user-visible confirmation |
| https://code.claude.com/docs/en/model-config | /config model=<x> model switching |
| https://code.claude.com/docs/en/remote-control | Model changes initiated from another device |

Total scope: 3 pages should describe the same fast-mode state-change announcement.

The behavior was added in Claude Code v2.1.218.