diff --git a/codex-rs/exec/src/cli.rs b/codex-rs/exec/src/cli.rs
index 323cc879fe..d264eb61b0 100644
--- a/codex-rs/exec/src/cli.rs
+++ b/codex-rs/exec/src/cli.rs
@@ -77,7 +77,7 @@ pub struct Cli {
 
     /// Initial instructions for the agent. If not provided as an argument (or
     /// if `-` is used), instructions are read from stdin.
-    #[arg(value_name = "PROMPT")]
+    #[arg(value_name = "PROMPT", value_hint = clap::ValueHint::Other)]
     pub prompt: Option<String>,
 }
 
@@ -99,7 +99,7 @@ pub struct ResumeArgs {
     pub last: bool,
 
     /// Prompt to send after resuming the session. If `-` is used, read from stdin.
-    #[arg(value_name = "PROMPT")]
+    #[arg(value_name = "PROMPT", value_hint = clap::ValueHint::Other)]
     pub prompt: Option<String>,
 }
 
diff --git a/codex-rs/tui/src/cli.rs b/codex-rs/tui/src/cli.rs
index f0630a34c5..ee2a0355da 100644
--- a/codex-rs/tui/src/cli.rs
+++ b/codex-rs/tui/src/cli.rs
@@ -7,7 +7,7 @@ use std::path::PathBuf;
 #[command(version)]
 pub struct Cli {
     /// Optional user prompt to start the session.
-    #[arg(value_name = "PROMPT")]
+    #[arg(value_name = "PROMPT", value_hint = clap::ValueHint::Other)]
     pub prompt: Option<String>,
 
     /// Optional image(s) to attach to the initial prompt.