Agent UI v0.4.0 Specification

The v0.4.0 specification snapshot is aligned with the current latest specification.

v0.4.0 changes

• Promotes Artifact Workspace to a first-class Agent UI surface.
• Defines the interaction boundary between conversation, Artifact Workspace, artifact services, and evidence systems.
• Adds artifact workspace contract language for cards, preview, edit/canvas, version rail, diff/review, export/handoff, source links, and evidence links.
• Adds specific artifact event classes: artifact.created, artifact.updated, artifact.preview.ready, artifact.version.created, artifact.diff.ready, artifact.export.started, artifact.export.completed, artifact.failed, and artifact.deleted.
• Keeps artifact.changed as a collapsed adapter event for compatibility.

See the latest specification for the full runtime and surface rules.