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Showcase previews are public-safe metadata. They help a developer, reviewer, or agent explain what an app artifact is before any marketplace install path exists. Generate JSON metadata: 
npx @budscollab/cli app showcase budscollab.blueprint.json --out budscollab-showcase.json
Generate a Markdown preview: 
npx @budscollab/cli app showcase budscollab.blueprint.json --format markdown --out SHOWCASE.md
A showcase can include:
  • app id, name, description, publisher, category, and distribution target
  • surfaces and capabilities
  • safety badges
  • tool permission mode
  • warnings
  • review stage, install status, next gate, and blockers
A showcase does not:
  • execute external app code
  • register a collection entry
  • prove publisher identity
  • store review evidence
  • sign the artifact
  • make the package installable
Use the phrase preview-only when a showcase or sandbox preview exists but install is not allowed. Use review-gated after validation when signing, publisher verification, or stored review evidence is still missing.