What problem does it solve? VS Code windows across multiple projects and roles often look identical, carry broken low-contrast colors, or drift between title bar and status bar. This Skill provides a registry of currently set window colors plus a deterministic assignment plan so every project-role combination gets a consistent, WCAG-compliant color without bookkeeping. ## Core Features & Use Cases - Deterministic color derivation: Computes oklch-based hex colors from a project slot (hue) and role rung (lightness), reproducible on any machine via the colorRegistry module. - Registry with audit trail: Documents every existing *.code-workspace and .vscode/settings.json color block with its expected value, actual value, and contrast ratio. - Pitfall guidance: Covers VS Code hex-only parsing (oklch renders red), HSL luminance failures, Peacock conflicts, native title bar behavior, and color-vision-deficiency constraints. - Use Case: When creating a new web.code-workspace for a project, look up the project slot and role rung, run the deriveColor command, and write the four workbench.colorCustomizations keys with the resulting hex value. ## Quick Start Ask the assistant to derive and apply the correct window color for a given project and role, for example: set the window colors for the web workspace of Claude-Template using the color registry.