diff --git a/cli/bpmetadata/proto/bpmetadata.proto b/cli/bpmetadata/proto/bpmetadata.proto
index 1a0c23565e7..47c29077f4e 100644
--- a/cli/bpmetadata/proto/bpmetadata.proto
+++ b/cli/bpmetadata/proto/bpmetadata.proto
@@ -192,6 +192,21 @@ message BlueprintRequirements {
   // Gen: auto-generated - all services required for the blueprint in test/setup/main.tf
   // as "activate_apis" in the project module.
   repeated string services = 2; // @gotags: json:"services,omitempty" yaml:"services,omitempty"
+
+  // Required provider versions.
+  // Gen: auto-generated from required providers block.
+  repeated ProviderVersion provider_versions = 3; // @gotags: json:"versions,omitempty" yaml:"providerVersions,omitempty"
+}
+
+// ProviderVersion defines the required version for a provider.
+message ProviderVersion {
+  // Provider source of form [hostname]/namespace/name.
+  // Hostname is optional defaulting to Terraform registry.
+  // Gen: auto-generated from required providers block.
+  string source = 1; // @gotags: json:"source,omitempty" yaml:"source,omitempty"
+  // Version constraint string.
+  // Gen: auto-generated from required providers block.
+  string version = 2; // @gotags: json:"version,omitempty" yaml:"version,omitempty"
 }
 
 // BlueprintUI is the top-level structure for holding UI specific metadata.
@@ -453,6 +468,43 @@ message BlueprintVariable {
   string var_type = 3; // @gotags: json:"varType,omitempty" yaml:"varType,omitempty"
   google.protobuf.Value default_value = 4; // @gotags: json:"defaultValue,omitempty" yaml:"defaultValue,omitempty"
   bool required = 5; // @gotags: json:"required,omitempty" yaml:"required,omitempty"
+  // Incoming connections to this variable.
+  // Gen: manually-authored.
+  repeated BlueprintConnection connections = 6; // @gotags: json:"connections,omitempty" yaml:"connections,omitempty"
+}
+
+// Defines an incoming connection from a blueprint.
+message BlueprintConnection {
+  // Source of the connection.
+  // Gen: manually-authored.
+  ConnectionSource source = 1; // @gotags: json:"source,omitempty" yaml:"source,omitempty"
+  // Connection specifications.
+  // Gen: manually-authored.
+  ConnectionSpec spec = 2; // @gotags: json:"spec,omitempty" yaml:"spec,omitempty"
+}
+
+// Defines the source of a connection.
+message ConnectionSource {
+  // Source of the connection. Defined using the same format as module source
+  // of form [hostname]/namespace/name/provider for registry references and
+  // unprefixed github.com URLs for github references.
+  // Gen: manually-authored.
+  string source = 1; // @gotags: json:"source,omitempty" yaml:"source,omitempty"
+  // Version constraint syntax using the same format as module version
+  // constraints.
+  // Gen: manually-authored.
+  string version = 2; // @gotags: json:"version,omitempty" yaml:"version,omitempty"
+}
+
+// Defines the specifications of a connection.
+message ConnectionSpec {
+  // Output expression identifying output being connected to variable.
+  // This can be the output name or more complex expression like attribuite notation.
+  // Gen: manually-authored.
+  string output_expr = 1; // @gotags: json:"outputExpr,omitempty" yaml:"outputExpr,omitempty"
+  // Optional dot separated attribuite notation to connect to a specific object field of the input variable.
+  // Gen: manually-authored.
+  optional string input_path = 2; // @gotags: json:"inputPath,omitempty" yaml:"inputPath,omitempty"
 }
 
 // BlueprintVariableGroup is manually entered.
@@ -465,6 +517,10 @@ message BlueprintVariableGroup {
 message BlueprintOutput {
   string name = 1; // @gotags: json:"name" yaml:"name"
   string description = 2; // @gotags: json:"description,omitempty" yaml:"description,omitempty"
+  // Serialized type representation of the output value.
+  // Gen: manually-authored but will be automated in the future.
+  optional google.protobuf.Value type = 3; // @gotags: json:"type,omitempty" yaml:"type,omitempty"
+
 }
 
 message BlueprintRoles {
diff --git a/cli/bpmetadata/proto/bpmetadata_ui.proto b/cli/bpmetadata/proto/bpmetadata_ui.proto
index d4d4a834388..a3162d8e73e 100644
--- a/cli/bpmetadata/proto/bpmetadata_ui.proto
+++ b/cli/bpmetadata/proto/bpmetadata_ui.proto
@@ -2,6 +2,7 @@ syntax = "proto3";
 
 package google.cloud.config.bpmetadata;
 
+import "google/protobuf/struct.proto";
 import "bpmetadata_ui_ext.proto";
 
 // TODO: update copybara configuration for go to java package transformation
@@ -126,6 +127,22 @@ message DisplayVariable {
   // Optional.
   // Gen: manually-authored
   string boolean_group = 20; // @gotags: json:"booleanGroup,omitempty" yaml:"booleanGroup,omitempty"
+
+  // Alternate default value.
+  // Gen: manually-authored.
+  message AlternateDefault {
+    // Type of the alternate default.
+    enum AlternateType {
+      // Default
+      ALTERNATE_TYPE_UNSPECIFIED = 0;
+      // A more secure default.
+      ALTERNATE_TYPE_SECURITY = 1;
+    }
+    AlternateType type = 1;  // @gotags: json:"type,omitempty" yaml:"type,omitempty"
+    // Value of the alternate default.
+    google.protobuf.Value value = 2; // @gotags: json:"value,omitempty" yaml:"value,omitempty"
+  }
+  repeated AlternateDefault alt_defaults = 21; // @gotags: json:"altDefaults,omitempty" yaml:"altDefaults,omitempty"
 }
 
 message ValueLabel {
@@ -248,4 +265,14 @@ message DisplayOutput {
   // label to display on the Output action button
   // Gen: manually-authored
   string label = 3; // @gotags: json:"label,omitempty" yaml:"label,omitEmpty"
+
+  // Visibility defines how the output is exposed.
+  // Gen: manually-authored.
+  enum Visibility {
+    // Default
+    VISIBILITY_UNSPECIFIED = 0;
+    // Expose output as root module output.
+    VISIBILITY_ROOT = 1;
+  }
+  Visibility visibility = 4;  // @gotags: json:"visibility,omitempty" yaml:"visibility,omitEmpty"
 }