[codex] draft Windows computer-use blog

[f-trycua]

What changed

• Added a Windows launch blog draft under blog/inside-windows-computer-use.md.
• Focused the draft on synthetic cursors, Windows app-stack fragmentation, UIA/MSAA, WGC capture, dispatch modes, and the daemon/session model.

Why

This gives us reviewable long-form copy for the Cua Driver Windows launch before the demos are linked and published.

Validation

• Checked existing /blog filename and title patterns, then named this file consistently.
• Ran a write-well pattern scan over the draft.
• Ran git diff --cached --check to catch whitespace issues.
• No code tests run; this PR only adds draft Markdown copy.

Summary by CodeRabbit

• Documentation
  • Added comprehensive guide explaining Windows background computer-use features, including screenshot capture, UI accessibility, action dispatch, synthetic cursors, and daemon functionality.
  • Included Windows installation and configuration instructions.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	May 27, 2026 5:21pm

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📝 Walkthrough

Walkthrough

Adds a comprehensive documentation page explaining Windows background computer-use in Cua Driver. The article covers routing strategy across screenshot capture, accessibility tree acquisition, and action dispatch; documents synthetic cursors and Session 0 daemon architecture; and provides installation and operational setup instructions.

Changes

Windows Computer-Use Implementation Guide

Layer / File(s)	Summary
Introduction and overview blog/inside-windows-computer-use.md	Page introduction with draft marker and TL;DR summarizing background Windows support, multi-backend routing, window pixels plus accessibility plus action layer, and synthetic-cursor concept.
Core Windows routing strategy blog/inside-windows-computer-use.md	Technical routing explanation covering screenshot capture selection and fallback detection (PrintWindow, Windows Graphics Capture, BitBlt), accessibility tree acquisition via UIA caching and desktop-root filtering with MSAA fallback for VCL/SAL, and action dispatch precedence favoring UIA patterns with fallback to Win32 input and hit-test strategies for canvas targets. Defines background dispatch contract and explicit failure modes with foreground opt-in.
Synthetic cursors and Session 0 daemon architecture blog/inside-windows-computer-use.md	Documents transparent layered overlay synthetic cursors with per-agent cursor identity, trace and recording synchronization, and the daemon proxying model for Session 0 scenarios using an interactive-session daemon that proxies tool calls over named pipes. Lists two recorded demo types and remaining failure modes (minimized windows, misbehaving providers, Session 0 without daemon).
Installation and operations instructions blog/inside-windows-computer-use.md	PowerShell installation command, doctor and status diagnostic checks, Claude Code MCP integration wiring with stdio configuration, mcp-config command output guidance, and links to repository and documentation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~18 minutes

Possibly related PRs

• trycua/cua#1608: Documents UI Automation CoreWindow/UWP handling via desktop-root and UIA root-walk fallback, matching this PR's explanation of accessibility tree acquisition for UWP edge cases.
• trycua/cua#1627: Documents Windows input and action routing behavior for cua-driver with UIA-first dispatch and Win32 fallback, overlapping with this PR's dispatch precedence and foreground/background dispatch contract explanation.

Poem

🐰 Through Windows' layers deep and wide,

A driver routes with crafty pride—

From cursors synth to daemon's call,

This doc explains it all,

Where background tasks and windows collide! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title '[codex] draft Windows computer-use blog' accurately summarizes the main change—adding a new Windows computer-use documentation blog post.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/cua-driver-windows-blog

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