Display YOLO mode permissions if set when launching TUI (#17877)

- When launching the TUI client, if YOLO mode is enabled, display this
in the header.
- Eligibility is determined by `approval_policy = "never"` and
`sandbox_mode = "danger-full-access"`

<img width="886" height="230" alt="image"
src="https://github.com/user-attachments/assets/d7064778-e32c-4123-8e44-ca0c9016ab09"
/>

codex-rs/tui/src/app.rs

@@ -1599,6 +1599,7 @@ impl App {
             self.config.cwd.to_path_buf(),
             version,
         )
+        .with_yolo_mode(history_cell::is_yolo_mode(&self.config))
         .display_lines(width)
     }
 

codex-rs/tui/src/chatwidget.rs

@@ -9722,14 +9722,17 @@ impl ChatWidget {
     /// Build a placeholder header cell while the session is configuring.
     fn placeholder_session_header_cell(config: &Config) -> Box<dyn HistoryCell> {
         let placeholder_style = Style::default().add_modifier(Modifier::DIM | Modifier::ITALIC);
-        Box::new(history_cell::SessionHeaderHistoryCell::new_with_style(
-            DEFAULT_MODEL_DISPLAY_NAME.to_string(),
-            placeholder_style,
-            /*reasoning_effort*/ None,
-            /*show_fast_status*/ false,
-            config.cwd.to_path_buf(),
-            CODEX_CLI_VERSION,
-        ))
+        Box::new(
+            history_cell::SessionHeaderHistoryCell::new_with_style(
+                DEFAULT_MODEL_DISPLAY_NAME.to_string(),
+                placeholder_style,
+                /*reasoning_effort*/ None,
+                /*show_fast_status*/ false,
+                config.cwd.to_path_buf(),
+                CODEX_CLI_VERSION,
+            )
+            .with_yolo_mode(history_cell::is_yolo_mode(config)),
+        )
     }
 
     /// Merge the real session info cell with any placeholder header to avoid double boxes.

codex-rs/tui/src/history_cell.rs

@@ -61,9 +61,11 @@ use codex_protocol::openai_models::ReasoningEffort as ReasoningEffortConfig;
 use codex_protocol::plan_tool::PlanItemArg;
 use codex_protocol::plan_tool::StepStatus;
 use codex_protocol::plan_tool::UpdatePlanArgs;
+use codex_protocol::protocol::AskForApproval;
 use codex_protocol::protocol::FileChange;
 use codex_protocol::protocol::McpAuthStatus;
 use codex_protocol::protocol::McpInvocation;
+use codex_protocol::protocol::SandboxPolicy;
 use codex_protocol::protocol::SessionConfiguredEvent;
 use codex_protocol::request_user_input::RequestUserInputAnswer;
 use codex_protocol::request_user_input::RequestUserInputQuestion;
@@ -1186,6 +1188,8 @@ pub(crate) fn new_session_info(
     let SessionConfiguredEvent {
         model,
         reasoning_effort,
+        approval_policy,
+        sandbox_policy,
         ..
     } = event;
     // Header box rendered as history (so it appears at the very top)
@@ -1195,7 +1199,8 @@ pub(crate) fn new_session_info(
         show_fast_status,
         config.cwd.to_path_buf(),
         CODEX_CLI_VERSION,
-    );
+    )
+    .with_yolo_mode(has_yolo_permissions(approval_policy, &sandbox_policy));
     let mut parts: Vec<Box<dyn HistoryCell>> = vec![Box::new(header)];
 
     if is_first_event {
@@ -1259,6 +1264,17 @@ pub(crate) fn new_session_info(
     SessionInfoCell(CompositeHistoryCell { parts })
 }
 
+pub(crate) fn is_yolo_mode(config: &Config) -> bool {
+    has_yolo_permissions(
+        config.permissions.approval_policy.value(),
+        config.permissions.sandbox_policy.get(),
+    )
+}
+
+fn has_yolo_permissions(approval_policy: AskForApproval, sandbox_policy: &SandboxPolicy) -> bool {
+    approval_policy == AskForApproval::Never && *sandbox_policy == SandboxPolicy::DangerFullAccess
+}
+
 pub(crate) fn new_user_prompt(
     message: String,
     text_elements: Vec<TextElement>,
@@ -1281,6 +1297,7 @@ pub(crate) struct SessionHeaderHistoryCell {
     reasoning_effort: Option<ReasoningEffortConfig>,
     show_fast_status: bool,
     directory: PathBuf,
+    yolo_mode: bool,
 }
 
 impl SessionHeaderHistoryCell {
@@ -1316,9 +1333,15 @@ impl SessionHeaderHistoryCell {
             reasoning_effort,
             show_fast_status,
             directory,
+            yolo_mode: false,
         }
     }
 
+    pub(crate) fn with_yolo_mode(mut self, yolo_mode: bool) -> Self {
+        self.yolo_mode = yolo_mode;
+        self
+    }
+
     fn format_directory(&self, max_width: Option<usize>) -> String {
         Self::format_directory_inner(&self.directory, max_width)
     }
@@ -1377,7 +1400,12 @@ impl HistoryCell for SessionHeaderHistoryCell {
         const CHANGE_MODEL_HINT_COMMAND: &str = "/model";
         const CHANGE_MODEL_HINT_EXPLANATION: &str = " to change";
         const DIR_LABEL: &str = "directory:";
-        let label_width = DIR_LABEL.len();
+        const PERMISSIONS_LABEL: &str = "permissions:";
+        let label_width = if self.yolo_mode {
+            DIR_LABEL.len().max(PERMISSIONS_LABEL.len())
+        } else {
+            DIR_LABEL.len()
+        };
 
         let model_label = format!(
             "{model_label:<label_width$}",
@@ -1411,13 +1439,21 @@ impl HistoryCell for SessionHeaderHistoryCell {
         let dir = self.format_directory(Some(dir_max_width));
         let dir_spans = vec![Span::from(dir_prefix).dim(), Span::from(dir)];
 
-        let lines = vec![
+        let mut lines = vec![
             make_row(title_spans),
             make_row(Vec::new()),
             make_row(model_spans),
             make_row(dir_spans),
         ];
 
+        if self.yolo_mode {
+            let permissions_label = format!("{PERMISSIONS_LABEL:<label_width$}");
+            lines.push(make_row(vec![
+                Span::from(format!("{permissions_label} ")).dim(),
+                "YOLO mode".magenta().bold(),
+            ]));
+        }
+
         with_border(lines)
     }
 }
@@ -3956,6 +3992,25 @@ mod tests {
         assert!(!model_line.contains("fast"));
     }
 
+    #[test]
+    #[cfg_attr(
+        target_os = "windows",
+        ignore = "snapshot path rendering differs on Windows"
+    )]
+    fn session_header_indicates_yolo_mode() {
+        let cell = SessionHeaderHistoryCell::new(
+            "gpt-5".to_string(),
+            /*reasoning_effort*/ None,
+            /*show_fast_status*/ false,
+            test_path_buf("/tmp/project").abs().to_path_buf(),
+            "test",
+        )
+        .with_yolo_mode(/*yolo_mode*/ true);
+
+        let rendered = render_lines(&cell.display_lines(/*width*/ 80)).join("\n");
+        insta::assert_snapshot!(rendered);
+    }
+
     #[test]
     fn session_header_directory_center_truncates() {
         let mut dir = home_dir().expect("home directory");

codex-rs/tui/src/snapshots/codex_tui__history_cell__tests__session_header_indicates_yolo_mode.snap

@@ -0,0 +1,11 @@
+---
+source: tui/src/history_cell.rs
+expression: rendered
+---
+╭───────────────────────────────────────╮
+│ >_ OpenAI Codex (vtest)               │
+│                                       │
+│ model:       gpt-5   /model to change │
+│ directory:   /tmp/project             │
+│ permissions: YOLO mode                │
+╰───────────────────────────────────────╯