[quentinleon]

Agents authoring UI Toolkit assets currently have no isolated way to populate fixture states, inspect resolved bindings and layout, or verify the rendered result. This adds a Unity 6+ ucp ui workflow that performs those steps without loading or dirtying a scene.

• Add ui list, importer/clone-backed ui lint for UXML/USS/TSS, bounded ui inspect, panel PNG ui screenshot, and multi-state ui check.
• Support strict .ucp-ui.json scenarios with data overlays, fixture mutations, repeat templates, and managed virtualized ListViews.
• Traverse realized control children, preserve error details under diagnostic limits, and avoid false focus warnings on Unity internals. Inspect immutable package artifacts without forced reimport.
• Report interrupted UI operations on reload/quit, recover results through status lookup after notification timeouts, and allow the bridge's 300-second ceiling through the default CLI render timeout.
• Add command documentation, mirrored website content, and a generated ucp-ui micro-skill.

ucp ui screenshot captures the isolated UI harness. The existing top-level ucp screenshot implementation is unchanged.

Validation

Validated after integrating upstream 0.6.2:

• Rust: all 117 tests passed offline.
• Unity 6000.3.20f1, Linux with graphics enabled: all 52 UI Editor tests passed, none skipped, in an isolated project using this branch's bridge package.
• Website production build passed.
• Version metadata, generated micro-skills, and whitespace checks passed.

Live checks before the upstream integration also confirmed that a visible empty ListView passes --fail-on-warnings, a late binding error survives a full warning budget, reload produces a structured interruption result, and immutable package lint does not force reimport.

Other Unity versions and platforms have not been validated for this feature. Rendering requires an interactive Editor with a graphics device; lint supports batch mode. The capture backend uses an internal Editor API, so additional Unity-version coverage remains valuable before release.

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[mflRevan]

Merged into main for 0.6.3 with your three commits intact, followed by two integration commits (a2f1f02, 389fc00). Thank you for a thorough, well-tested contribution; it fits the bridge and CLI conventions closely and needed only small adjustments:

• Eight .cs.meta files were two-line stubs; they are now in the package's full MonoImporter form so Unity does not rewrite them on first import.
• UiOperationManager.Tick now returns early while idle (it runs on every editor update once subscribed), and ActivateNextForTests() replaces the reflection call in the shutdown test.
• UiSimpleQuery.Validate rejects compound selectors such as .a.b / #a#b up front instead of validating them and matching nothing.
• Scenario capture artifacts are named Inventory-<state>-...png rather than Inventory.ucp-ui-<state>-...png.
• Added tests on top of yours: broken USS and unknown-UXML-element lint through the real importers and the router, the full set allowlist end to end, ui/list with an invalid fixture, selector/query validation, ui/status for unknown ids, and envelope sanitizing; plus Rust coverage for result aggregation and --force requiring an output target.
• Changelog entries (CLI and bridge) and a PROJECT.md section for the harness.

Validation on this end: 121 Rust tests; bridge edit-mode tests 160/160 in batch mode on every Unity 6 slot (6000.0, 6000.1, 6000.2, 6000.3, 6000.4) with zero skips, so the CaptureEditorWindow path and the window-backed tests hold across the range you had not covered; and a live list/lint/inspect/screenshot/check --all-states pass against a scenario fixture on 6000.4 (Windows, D3D12) with both states captured correctly and bindings resolved on repeat cards and realized ListView rows.

It ships in 0.6.3.