Get Marketplace Skills
Get skills from marketplace repositories.
This endpoint fetches and returns skill metadata from marketplace repos without requiring an active sandbox session. Useful for previewing what skills a marketplace provides before or after adding it.
Each call clones the marketplace repos fresh; this endpoint is admin-only and low-traffic, so caching the git clones here would buy little for the cross-user / pod-local complexity a shared cache introduces.
Args: marketplaces: List of marketplace registrations to fetch skills from.
Returns: MarketplaceSkillsPreviewResponse with skill metadata and any errors.
Authorizations
Body
Identifier for this marketplace registration
Marketplace source: 'github:owner/repo', git URL, or local path
Optional branch, tag, or commit (only for git sources)
Subdirectory path within the git repository containing the marketplace (e.g., 'marketplaces/internal' for monorepos). Only relevant for git sources, not local paths.
Auto-load behavior for this marketplace. True = load all plugins at conversation start. False = registered for resolution but not auto-loaded.
Scope of this marketplace registration. Set automatically by backend based on storage layer: "instance" for system defaults, "org" for organization-level, "personal" for user-level. Frontend should NOT send this field in save requests.
instance, org, personal 
