Apple is testing a hidden popover interface for Siri AI in the macOS 27 Golden Gate beta that surfaces Writing Tools and contextual actions when text is selected. Spotted by a member of Reddit's r/MacOSBeta community, the floating icon appears at the top-left of selected text, expanding on hover to a compact popover.

The popover offers Rewrite, Proofread, "How does this sound?" and "Edit with Siri," plus key points and summarization. Contextual actions include adding contacts, composing messages or emails, creating calendar events, showing locations in Maps, and tracking flights or packages.

Disabled by default in macOS 27 developer beta 3 and public beta 1, the feature can be enabled via a private feature flag using Terminal commands. However, it's unfinished—some actions don't respond, and behavior is inconsistent.

Adventurous beta users can enable it with: sudo mkdir -p /Library/Preferences/FeatureFlags/Domain && sudo defaults write /Library/Preferences/FeatureFlags/Domain/WritingTools LightweightUI_macos -dict Enabled -bool true (restart required). Disable with sudo defaults write /Library/Preferences/FeatureFlags/Domain/WritingTools LightweightUI_macos -dict Enabled -bool false. No guarantee it reaches final release this fall.