diff --git a/crates/tui/src/core/engine.rs b/crates/tui/src/core/engine.rs
index 4b6ff40b..9b76a7f8 100644
--- a/crates/tui/src/core/engine.rs
+++ b/crates/tui/src/core/engine.rs
@@ -2774,10 +2774,7 @@ impl Engine {
                                         round.stdout, round.stderr
                                     )
                                 } else {
-                                    format!(
-                                        "[REPL round {round_num} output]\n{}",
-                                        round.stdout
-                                    )
+                                    format!("[REPL round {round_num} output]\n{}", round.stdout)
                                 };
                                 self.add_session_message(Message {
                                     role: "user".to_string(),
@@ -2811,13 +2808,13 @@ impl Engine {
 
                     if let Some(final_val) = final_result {
                         // Replace the assistant's text with the FINAL answer.
-                        if let Some(last_msg) = self.session.messages.last_mut() {
-                            if last_msg.role == "assistant" {
-                                for block in &mut last_msg.content {
-                                    if let ContentBlock::Text { text, .. } = block {
-                                        *text = final_val;
-                                        break;
-                                    }
+                        if let Some(last_msg) = self.session.messages.last_mut()
+                            && last_msg.role == "assistant"
+                        {
+                            for block in &mut last_msg.content {
+                                if let ContentBlock::Text { text, .. } = block {
+                                    *text = final_val;
+                                    break;
                                 }
                             }
                         }
diff --git a/crates/tui/src/repl/runtime.rs b/crates/tui/src/repl/runtime.rs
index c9add9f9..8435b542 100644
--- a/crates/tui/src/repl/runtime.rs
+++ b/crates/tui/src/repl/runtime.rs
@@ -15,7 +15,7 @@ use std::time::{Duration, Instant};
 
 use tokio::process::Command;
 
-use super::sandbox::{ReplOutput, parse_final};
+use super::sandbox::parse_final;
 
 /// Python REPL runtime — executes code blocks in isolated processes
 /// with persistent variable state via a JSON state file.
@@ -127,10 +127,7 @@ impl PythonRuntime {
         std::fs::create_dir_all(&dir)
             .map_err(|e| format!("Failed to create REPL temp dir: {e}"))?;
 
-        let state_path = dir.join(format!(
-            "state_{}.json",
-            std::process::id()
-        ));
+        let state_path = dir.join(format!("state_{}.json", std::process::id()));
 
         Ok(Self {
             state_path,
@@ -173,14 +170,21 @@ impl PythonRuntime {
                 .arg("-u") // unbuffered
                 .arg("-c")
                 .arg(&full_script)
-                .env("REPL_STATE_FILE", self.state_path.to_string_lossy().as_ref())
+                .env(
+                    "REPL_STATE_FILE",
+                    self.state_path.to_string_lossy().as_ref(),
+                )
                 .output()
                 .await
                 .map_err(|e| format!("Failed to execute python3: {e}"))
         })
         .await
-        .map_err(|_| format!("Python REPL round timed out after {}s", ROUND_TIMEOUT.as_secs()))?
-        .map_err(|e| e)?;
+        .map_err(|_| {
+            format!(
+                "Python REPL round timed out after {}s",
+                ROUND_TIMEOUT.as_secs()
+            )
+        })??;
 
         let full_stdout = String::from_utf8_lossy(&output.stdout).to_string();
         let stderr = String::from_utf8_lossy(&output.stderr).to_string();
@@ -260,7 +264,10 @@ mod tests {
     #[tokio::test]
     async fn repl_executes_simple_code() {
         let mut rt = PythonRuntime::new().await.expect("create runtime");
-        let round = rt.execute("print('hello from repl')").await.expect("execute");
+        let round = rt
+            .execute("print('hello from repl')")
+            .await
+            .expect("execute");
         assert!(round.stdout.contains("hello from repl"));
         assert!(!round.has_error);
         assert!(round.final_value.is_none());
@@ -289,16 +296,15 @@ mod tests {
         rt.execute("repl_set('count', 41)").await.expect("round 1");
         // Round 2: read it back and increment.
         let round = rt
-            .execute("val = repl_get('count', 0); repl_set('count', val + 1); print(f'count={val+1}')")
+            .execute(
+                "val = repl_get('count', 0); repl_set('count', val + 1); print(f'count={val+1}')",
+            )
             .await
             .expect("round 2");
         assert!(round.stdout.contains("count=42"));
 
         // Round 3: verify via FINAL_VAR.
-        let round = rt
-            .execute("FINAL_VAR('count')")
-            .await
-            .expect("round 3");
+        let round = rt.execute("FINAL_VAR('count')").await.expect("round 3");
         assert_eq!(round.final_value.as_deref(), Some("42"));
 
         let _ = std::fs::remove_file(&state_path);
diff --git a/crates/tui/src/repl/sandbox.rs b/crates/tui/src/repl/sandbox.rs
index 7bc4c87d..4dc6d620 100644
--- a/crates/tui/src/repl/sandbox.rs
+++ b/crates/tui/src/repl/sandbox.rs
@@ -1,8 +1,6 @@
 //! REPL sandbox utilities: FINAL/FINAL_VAR parsing, llm_query injection,
 //! and the ReplOutput type.
 
-use serde_json::Value as JsonValue;
-
 /// Output from a REPL execution round.
 #[derive(Debug, Clone)]
 pub struct ReplOutput {