diff --git a/llm/provider.go b/llm/provider.go
index 70c84a7..7e1cd75 100644
--- a/llm/provider.go
+++ b/llm/provider.go
@@ -168,6 +168,14 @@ type Model struct {
 	Capabilities     []string        `json:"capabilities,omitempty"`
 	Source           string          `json:"source,omitempty"`
 	LiveMetadata     json.RawMessage `json:"live_metadata,omitempty"`
+
+	// SupportsThinkingToggle indicates this model's provider wire protocol
+	// honors the ThinkingEnabled toggle. Populated by the engine catalog.
+	SupportsThinkingToggle bool `json:"supports_thinking_toggle,omitempty"`
+	// DefaultThinkingEnabled is the provider-default thinking state for this
+	// model when no explicit user preference is set. nil means no provider
+	// default (fall through to global settings).
+	DefaultThinkingEnabled *bool `json:"default_thinking_enabled,omitempty"`
 }
 
 // ModelClass is a provider-neutral relative model cost/capability band.
@@ -272,22 +280,31 @@ type GatewayInspector interface {
 	RoutingPreview(ctx context.Context, modelID string) (string, error)
 }
 
+// GatewayRegionOption describes one selectable region for a regional gateway.
+type GatewayRegionOption struct {
+	Value       string `json:"value"`
+	DisplayName string `json:"display_name"`
+	Endpoint    string `json:"endpoint,omitempty"`
+}
+
 // Gateway is a provider/gateway descriptor.
 type Gateway struct {
-	ID                    string `json:"id"`
-	DisplayName           string `json:"display_name"`
-	DeploymentID          string `json:"deployment_id,omitempty"`
-	CredentialEnv         string `json:"credential_env"`
-	RequiresKey           bool   `json:"requires_key"`
-	SortOrder             int    `json:"sort_order"`
-	ChatPreference        int    `json:"chat_preference"`
-	SupportsLiveDiscovery bool   `json:"supports_live_discovery"`
-	CredentialConfigured  bool   `json:"credential_configured"`
-	DeploymentConfigured  bool   `json:"deployment_configured"`
-	ModelCount            int    `json:"model_count"`
-	RegionLabel           string `json:"region_label,omitempty"`
-	RegionRequired        bool   `json:"region_required"`
-	Active                bool   `json:"active"`
+	ID                    string                `json:"id"`
+	DisplayName           string                `json:"display_name"`
+	DeploymentID          string                `json:"deployment_id,omitempty"`
+	CredentialEnv         string                `json:"credential_env"`
+	RequiresKey           bool                  `json:"requires_key"`
+	SortOrder             int                   `json:"sort_order"`
+	ChatPreference        int                   `json:"chat_preference"`
+	SupportsLiveDiscovery bool                  `json:"supports_live_discovery"`
+	CredentialConfigured  bool                  `json:"credential_configured"`
+	DeploymentConfigured  bool                  `json:"deployment_configured"`
+	ModelCount            int                   `json:"model_count"`
+	RegionLabel           string                `json:"region_label,omitempty"`
+	RegionRequired        bool                  `json:"region_required"`
+	RegionOptions         []GatewayRegionOption `json:"region_options,omitempty"`
+	DNSHost               string                `json:"dns_host,omitempty"`
+	Active                bool                  `json:"active"`
 }
 
 // DeploymentSummary summarizes deployment routing for a model (host-facing).