diff --git a/lore-proto/proto/lore/thin_client/v1/model.proto b/lore-proto/proto/lore/thin_client/v1/model.proto
index 44812ae..ae28020 100644
--- a/lore-proto/proto/lore/thin_client/v1/model.proto
+++ b/lore-proto/proto/lore/thin_client/v1/model.proto
@@ -14,6 +14,14 @@ enum NodeType {
   LINK = 2;
 }
 
+// File mode for a file-system entry.
+enum FileMode {
+  // No special file mode.
+  NONE = 0;
+  // File is executable.
+  EXECUTABLE = 1;
+}
+
 // Per-path action describing what happened between two states (or relative
 // to the common ancestor in 3-way merges).
 enum Action {
@@ -90,6 +98,10 @@ message TreeNode {
   NodeType node_type = 2;
   // Content address for FILE / LINK entries; unused for DIRECTORY.
   lore.model.v1.Address address = 3;
+  // Original size in bytes. For DIRECTORY entries, this is the cumulative size of its descendant files.
+  uint64 size = 4;
+  // File mode for this entry. For possible flags and values, see enum FileMode.
+  uint64 mode = 5;
 }
 
 // Self-describing revision record. Carries the resolved RevisionIdentifier
diff --git a/lore-proto/src/grpc/lore.thin_client.v1.rs b/lore-proto/src/grpc/lore.thin_client.v1.rs
index 157147b..98ee32e 100644
--- a/lore-proto/src/grpc/lore.thin_client.v1.rs
+++ b/lore-proto/src/grpc/lore.thin_client.v1.rs
@@ -75,6 +75,12 @@ pub struct TreeNode {
     /// Content address for FILE / LINK entries; unused for DIRECTORY.
     #[prost(message, optional, tag = "3")]
     pub address: ::core::option::Option<crate::lore::model::v1::Address>,
+    /// Original size in bytes. For DIRECTORY entries, this is the cumulative size of its descendant files.
+    #[prost(uint64, tag = "4")]
+    pub size: u64,
+    /// File mode for this entry. For possible flags and values, see enum FileMode.
+    #[prost(uint64, tag = "5")]
+    pub mode: u64,
 }
 impl ::prost::Name for TreeNode {
     const NAME: &'static str = "TreeNode";
diff --git a/lore-proto/tests/v1_thin_client.rs b/lore-proto/tests/v1_thin_client.rs
index 84ccbac..ad5cf5f 100644
--- a/lore-proto/tests/v1_thin_client.rs
+++ b/lore-proto/tests/v1_thin_client.rs
@@ -108,6 +108,8 @@ fn v1_thin_client_field_shapes() {
         path: _,
         node_type: _,
         address: _,
+        size: _,
+        mode: _,
     } = TreeNode::default();
 
     // Revision + nested Parent + Metadata
diff --git a/lore-revision/src/state.rs b/lore-revision/src/state.rs
index 61f792d..b3401bd 100644
--- a/lore-revision/src/state.rs
+++ b/lore-revision/src/state.rs
@@ -3305,6 +3305,8 @@ pub struct TreePath {
     pub path: RelativePath,
     pub address: Option<Address>,
     pub flags: NodeFlags,
+    pub size: u64,
+    pub mode: u64,
 }
 
 pub type CanReadRepository = Arc<dyn Fn(RepositoryId) -> bool + Send + Sync>;
@@ -3466,6 +3468,8 @@ async fn gather_tree_paths_node(
         path: node_path.clone(),
         address,
         flags,
+        size: node.size,
+        mode: node.mode as u64,
     });
 
     let depth_remaining = max_depth == 0 || depth + 1 < max_depth;
diff --git a/lore-server/src/grpc/thinclient/v1/revision_tree.rs b/lore-server/src/grpc/thinclient/v1/revision_tree.rs
index d05f072..dadf610 100644
--- a/lore-server/src/grpc/thinclient/v1/revision_tree.rs
+++ b/lore-server/src/grpc/thinclient/v1/revision_tree.rs
@@ -155,6 +155,8 @@ async fn stream_tree(
                 hash: address.hash.into(),
                 context: address.context.into(),
             }),
+            size: tree_path.size,
+            mode: tree_path.mode,
         };
         if tx
             .send(Ok(RevisionTreeResponse {