Windows Platform Extension

windows-platform-extension

Role

This focused Layer 3 Domain Skill modifies the selected Professional Skill for analysis-agent, task-agent, and review-agent. It is never the primary Professional review owner. A review-agent must load it for Windows behavior. Use installed-client-change-builder for desktop source changes; select the actual service Professional before adding this modifier for a Windows service.

When To Use

• Use for a confirmed Windows target whose desktop framework, identity, deployment, integration, process, security, architecture, distribution, DPI, or accessibility behavior changes.
• For shared clients, also load cross-platform-client-extension when shared/native ownership changes.

Do Not Use

• Do not use for Web/PWA, generic backend or infrastructure work without Windows application or service behavior, non-Windows, C#-only, PowerShell-only, or framework-only work without a confirmed Windows target.
• Do not route a Windows service to installed-client-change-builder solely because its platform is Windows.
• Do not use for release, signing, rollout authorization, or independent review ownership.

Required Inputs

• Record target Windows/SDK range, Win32/WinUI/WPF/WinForms boundary, executable topology, package/app identity, packaged or unpackaged state, installer/update source, channel, and x86/x64/ARM64 claims.
• Record registration, activation, COM/IPC, privilege/container, secret, DLL, service/background/notification, DPI, accessibility, artifact, signing, and unavailable-host evidence.

Professional Decision Rules

• Derive the framework, lifecycle, thread, activation, and single-instance owners from repository and final artifact facts.
• Bind MSIX or unpackaged identity to installation, update, repair, uninstall, registration, protocol, file-association, and COM behavior.
• Treat registry, activation, named-pipe, COM, and DLL-loading surfaces as explicit trust and compatibility boundaries.
• Bind UAC, AppContainer, DPAPI, Credential Manager, service identity, background tasks, and notifications to principal, session, package identity, denial, and recovery.
• For a Windows service, preserve the actual service Professional's acceptance and add Windows-specific service evidence only.
• Prove each x86/x64/ARM64 claim in the final executable and dependency graph.
• Keep reusable accessibility rules in Foundation; prove only Windows DPI, UI Automation, input, and assistive-technology deltas here.
• Route signing, Store/enterprise/direct-release approval, and rollout decisions to delivery-release-gate.

High-Value Gotchas

• Debug can hide unpackaged activation, repair, dependency, and registration failures.
• A protocol, COM, named-pipe, or single-instance handoff can cross identity, integrity, session, or bitness boundaries.
• DPAPI scope, service accounts, interactive sessions, and DLL search paths can make local success non-portable.
• A signed main executable does not prove dependent binaries, architecture, installer, update, or distribution evidence.

Execution Checklist

• Load only the active decision family's Reference and preserve Professional and Foundation ownership.
• Exercise denied elevation, missing identity, repair/update interruption, external activation, architecture, session, DPI, and accessibility paths.
• Report target, package identity, artifact/channel, source freshness, untested paths, authorization owner, and non-inferences.

Stop / Escalation Conditions

• Stop on unknown target, framework, package/app identity, installer/update source, service owner, principal/session, trust boundary, architecture, channel, DPI/accessibility matrix, or artifact evidence.
• Resolve unknown targets from repository, build, and release facts; do not infer Windows from language or framework names.

Output Contract

Return the Windows decision, rejected alternative, Professional owner, framework/OS/identity/architecture scope, normal and failure behavior, and artifact/host validation. Include source freshness, authorization owner, proof limits, and residual risk.

Targeted References