Preview: fix URL-bar window drag, add close-and-release, port agent-side parity tools

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code

[Tryanks]

Summary

Three Preview-panel improvements toward t3code parity:

• URL-bar drag no longer moves the window (macOS). With the transparent titlebar, AppKit's native titlebar-region drag sat on top of the chrome row, so dragging the address bar moved the window instead of selecting text. The window now sets gpui's app_owns_titlebar_drag; all strips drag via window_drag_area, and the Diff/Plan tab strip's inert stretch gains one so it stays draggable. Bonus: titlebar clicks lose the macOS double-click-disambiguation delay.

• Close button releases the page. The Preview chrome gains an X that closes the tab and drops the conversation's WebView (webviews/urls/warm), so the page is torn down — scripts, media, sockets — rather than kept running behind a closed panel. Reopening or the next agent op recreates it on demand.

• Agent-side MCP parity: 4 new tools. t3code exposes 13 preview tools; tcode had 8. This ports the four a raw wry WebView (no CDP) can serve:

  • preview_resize — fill or fixed canvas (240..=3840, area-capped), 10 device presets with orientation; the fixed canvas centers in the panel and clamps to it (a native child view is not clipped by gpui). preview_status reports the canvas setting.
  • preview_press — keydown/keyup with modifiers; printable keys update editable targets, Enter submits the enclosing form (untrusted events have no default action).
  • preview_scroll — window or CSS-selected container, reports the final position.
  • preview_wait_for — selector / text / urlIncludes polled every 250 ms with a per-evaluation watchdog; broker timeout raised to 65 s so the 60 s wait ceiling cannot outlive it.

  t3code's preview_recording_start/stop are deliberately not ported: they need CDP screencast, which WKWebView cannot provide.

Test plan

• cargo test -p preview-mcp -p tcode-ui -p tcode-runtime — all green (20 / 214 / runtime suites)
• cargo clippy -p preview-mcp -p tcode-ui -p tcode-runtime -p tcode -- -D warnings — clean
• cargo check -p tcode — clean
• Manual (macOS): drag the URL bar → selects text; drag strip gaps → moves window; double-click strip → zoom; X closes Preview and tears the page down

🤖 Generated with Claude Code