diff --git a/src/commands/artifact.rs b/src/commands/artifact.rs
index 17d796f..9f6d612 100644
--- a/src/commands/artifact.rs
+++ b/src/commands/artifact.rs
@@ -441,23 +441,65 @@ pub async fn show_comment(client: &HotwiredClient, comment_id: &str) {
     }
 }
 
-/// Resolve a comment
-pub async fn resolve(client: &HotwiredClient, comment_id: &str) {
+/// Reply to an existing comment (inherits path/selection from parent)
+pub async fn reply_comment(client: &HotwiredClient, comment_id: &str, message: &str) {
     let state = validate::require_session(client).await;
 
     match client
         .request(
-            "artifact_resolve_comment",
+            "artifact_reply_comment",
             serde_json::json!({
                 "runId": state.run_id,
                 "commentId": comment_id,
-                "resolvedBy": state.role_id,
+                "message": message,
+                "author": state.role_id,
             }),
         )
         .await
     {
         Ok(response) if response.success => {
-            println!("Comment resolved: {}", comment_id);
+            let data = response.data.unwrap_or_default();
+            let reply_id = data
+                .get("commentId")
+                .and_then(|v| v.as_str())
+                .unwrap_or("?");
+            println!("Reply added: {} (in thread of {})", reply_id, comment_id);
+        }
+        Ok(response) => {
+            eprintln!(
+                "error: {}",
+                response.error.unwrap_or_else(|| "unknown".into())
+            );
+            std::process::exit(1);
+        }
+        Err(e) => handle_error(e),
+    }
+}
+
+/// Resolve a comment
+pub async fn resolve(client: &HotwiredClient, comment_id: &str, reply: Option<&str>) {
+    let state = validate::require_session(client).await;
+
+    let mut params = serde_json::json!({
+        "runId": state.run_id,
+        "commentId": comment_id,
+        "resolvedBy": state.role_id,
+    });
+
+    if let Some(reply_msg) = reply {
+        params
+            .as_object_mut()
+            .unwrap()
+            .insert("reply".to_string(), serde_json::json!(reply_msg));
+    }
+
+    match client.request("artifact_resolve_comment", params).await {
+        Ok(response) if response.success => {
+            if reply.is_some() {
+                println!("Reply added and comment resolved: {}", comment_id);
+            } else {
+                println!("Comment resolved: {}", comment_id);
+            }
         }
         Ok(response) => {
             eprintln!(
diff --git a/src/main.rs b/src/main.rs
index c50c85d..b62be68 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -317,13 +317,17 @@ enum ArtifactAction {
 
     /// Resolve a comment
     ///
-    /// Marks a comment as resolved.
+    /// Marks a comment as resolved. Optionally leave a closing reply.
     ///
     /// Examples:
     ///   hotwired-cli artifact resolve cmt_abc123
+    ///   hotwired-cli artifact resolve cmt_abc123 --reply "Addressed in revision 3"
     Resolve {
         /// Comment ID
         comment_id: String,
+        /// Optional closing reply before resolving
+        #[arg(long)]
+        reply: Option<String>,
     },
 
     /// List all versions of an artifact
@@ -378,6 +382,20 @@ enum CommentAction {
         reply_to: Option<String>,
     },
 
+    /// Reply to an existing comment
+    ///
+    /// Creates a threaded reply inheriting the parent's path and selection.
+    /// No need to specify path or target_text — they are inherited from the parent.
+    ///
+    /// Examples:
+    ///   hotwired-cli artifact comment reply cmt_abc123 "I agree, will fix"
+    Reply {
+        /// Comment ID to reply to
+        comment_id: String,
+        /// Reply message
+        message: String,
+    },
+
     /// Show a specific comment and its thread
     ///
     /// Retrieves a comment by ID along with any replies in its thread.
@@ -648,6 +666,12 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                     )
                     .await;
                 }
+                CommentAction::Reply {
+                    comment_id,
+                    message,
+                } => {
+                    commands::artifact::reply_comment(&client, &comment_id, &message).await;
+                }
                 CommentAction::Show { comment_id } => {
                     commands::artifact::show_comment(&client, &comment_id).await;
                 }
@@ -658,8 +682,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             ArtifactAction::Comments { path, status } => {
                 commands::artifact::list_comments(&client, &path, &status).await;
             }
-            ArtifactAction::Resolve { comment_id } => {
-                commands::artifact::resolve(&client, &comment_id).await;
+            ArtifactAction::Resolve { comment_id, reply } => {
+                commands::artifact::resolve(&client, &comment_id, reply.as_deref()).await;
             }
             ArtifactAction::Versions { path } => {
                 commands::artifact::list_versions(&client, &path).await;