diff --git a/crates/g3-cli/src/lib.rs b/crates/g3-cli/src/lib.rs
index 0ea24ca..fb34c5a 100644
--- a/crates/g3-cli/src/lib.rs
+++ b/crates/g3-cli/src/lib.rs
@@ -204,6 +204,8 @@ use rustyline::DefaultEditor;
 use sha2::{Digest, Sha256};
 use std::path::Path;
 use std::path::PathBuf;
+use std::process::exit;
+use sha2::{Digest, Sha256};
 use tokio_util::sync::CancellationToken;
 use tracing::{error, info};
 
@@ -325,6 +327,10 @@ pub async fn run() -> Result<()> {
         .await;
     }
 
+    if cli.codebase_fast_start.is_some() {
+        print!("codebase_fast_start is temporarily disabled.");
+        exit(1);
+    }
     // Otherwise, continue with normal mode
 
     // Only initialize logging if not in retro mode