Ecosystem Boundaries

Agent Artifact owns durable deliverable semantics. It should not become the whole content system.

Boundary	Rule
Runtime	Runtime produces and updates; Agent Artifact records deliverable identity, versions, parts, and refs.
UI	UI renders and edits; Agent Artifact supplies render manifests and source-of-truth ids.
Evidence	Evidence verifies and audits; Agent Artifact supplies artifact/version/part/export refs.
Policy	Policy allows or blocks export/retention/redaction; Agent Artifact records policy refs and resulting export state.
Knowledge	Knowledge supplies sources; Agent Artifact links parts to source refs.
Tool	Tools produce files and media; Agent Artifact normalizes outputs into durable artifacts.
Storage	Storage owns bytes; Agent Artifact owns byte refs and integrity metadata.

Anti-patterns

• Treating chat markdown as the only artifact source of truth.
• Using file extension as artifact kind.
• Letting viewer-local state become the artifact graph.
• Exporting private bytes without an export manifest and policy refs.
• Creating a new generic file card for every domain output.
• Losing source links and version ids during peer handoff.