meta

const (
	// FieldResourceUri is the leaf key under `_meta.ui` advertising the
	// `ui://...` URI that a tool's result can be rendered through.
	// Full path: `_meta.ui.resourceUri`.
	FieldResourceUri = "resourceUri"

	// FieldAllowedTools is the leaf key under `_meta.ui` carrying the per-
	// resource tool allowlist that guest-originated `tools/call` requests
	// must satisfy. Full path: `_meta.ui.allowedTools`.
	FieldAllowedTools = "allowedTools"

	// FieldAllowedToolBundles is the leaf key under `_meta.ui` carrying the
	// exact tool bundle ids the host must use when executing guest-originated
	// `tools/call` requests through an approval-aware server path.
	// Full path: `_meta.ui.allowedToolBundles`.
	FieldAllowedToolBundles = "allowedToolBundles"

	// FieldContentHash is the leaf key under `_meta.ui` carrying the
	// canonical content hash of a UI resource payload.
	// Full path: `_meta.ui.contentHash`.
	FieldContentHash = "contentHash"

	// FieldProtocolVersion is the leaf key under `_meta.ui` carrying the
	// `viant/mcp-ui` semantic version that produced the resource. Full
	// path: `_meta.ui.protocolVersion`.
	FieldProtocolVersion = "protocolVersion"

	// FieldRendererURL is the leaf key under `_meta.ui` carrying an explicit
	// same-origin renderer page URL the host may load instead of raw srcdoc when
	// the resource requires a richer authenticated runtime.
	FieldRendererURL = "rendererUrl"

	// FieldSandbox is the leaf key under `_meta.ui` carrying an explicit iframe
	// sandbox policy string for this resource. Empty means host default.
	FieldSandbox = "sandbox"

	// FieldCSP is the leaf key under `_meta.ui` carrying an explicit srcdoc CSP
	// policy override for browser hosts that assemble HTML via iframe.srcdoc.
	// Empty means host default deny-by-default CSP.
	FieldCSP = "csp"

	// FieldCSPPolicy is the leaf key under `_meta.ui` carrying a structured CSP
	// relaxation policy for browser hosts that assemble HTML via iframe.srcdoc.
	// Empty means host default deny-by-default CSP with no relaxations.
	FieldCSPPolicy = "cspPolicy"

	// FieldFallback is the leaf key under `_meta.ui` opting a resource or
	// tool in to embedded-resource compatibility behavior. Full path:
	// `_meta.ui.fallback`. The only currently meaningful value is the
	// constant FallbackEmbedded.
	FieldFallback = "fallback"
)

const FallbackEmbedded = "embedded"

const (
	// NamespaceUI is the parent key under which all UI extension metadata
	// lives in a `_meta` map.
	NamespaceUI = "ui"
)