fix: MCP Manager Add Stdio Server form improvements

src/cortex-tui/src/modal/mcp_manager/handlers.rs

@@ -141,6 +141,7 @@ impl McpManagerModal {
                             command: String::new(),
                             args: String::new(),
                             focus: AddStdioServerFocus::Name,
+                            error: None,
                         };
                     } else {
                         // HTTP transport
@@ -171,6 +172,7 @@ impl McpManagerModal {
             ref mut command,
             ref mut args,
             ref mut focus,
+            ref mut error,
         } = self.mode
         {
             match key.code {
@@ -180,6 +182,7 @@ impl McpManagerModal {
                         AddStdioServerFocus::Command => AddStdioServerFocus::Args,
                         AddStdioServerFocus::Args => AddStdioServerFocus::Name,
                     };
+                    *error = None; // Clear error on field switch
                     ModalResult::Continue
                 }
                 KeyCode::BackTab => {
@@ -200,6 +203,15 @@ impl McpManagerModal {
                             args: args_vec,
                         });
                     }
+                    // Set error message for empty required fields
+                    let err_msg = if name.is_empty() && command.is_empty() {
+                        "Error: Name and Command are required"
+                    } else if name.is_empty() {
+                        "Error: Server name is required"
+                    } else {
+                        "Error: Command is required"
+                    };
+                    *error = Some(err_msg.to_string());
                     ModalResult::Continue
                 }
                 KeyCode::Esc => {
@@ -211,6 +223,7 @@ impl McpManagerModal {
                     ModalResult::Continue
                 }
                 KeyCode::Char(c) => {
+                    *error = None; // Clear error when user starts typing
                     match focus {
                         AddStdioServerFocus::Name => name.push(c),
                         AddStdioServerFocus::Command => command.push(c),

src/cortex-tui/src/modal/mcp_manager/mod.rs

@@ -34,6 +34,7 @@ impl Modal for McpManagerModal {
                 command,
                 args,
                 focus,
+                error: _,
             } => {
                 match focus {
                     AddStdioServerFocus::Name => name.push_str(text),

src/cortex-tui/src/modal/mcp_manager/rendering.rs

@@ -302,12 +302,13 @@ impl McpManagerModal {
             ref command,
             ref args,
             focus,
+            ref error,
         } = self.mode
         {
             Clear.render(area, buf);
 
             let block = Block::default()
-                .title(" Add MCP Server ")
+                .title(" Add MCP Server - Stdio ")
                 .borders(Borders::ALL)
                 .border_style(Style::default().fg(CYAN_PRIMARY))
                 .style(Style::default().bg(SURFACE_1));
@@ -408,6 +409,12 @@ impl McpManagerModal {
                 .hint("Enter", "save")
                 .hint("Esc", "back");
             form_bar.render(chunks[4], buf);
+
+            // Render submission error message if present
+            if let Some(ref err_msg) = error {
+                let error_style = Style::default().fg(ERROR);
+                buf.set_string(chunks[4].x, chunks[4].y.saturating_sub(1), err_msg, error_style);
+            }
         }
     }
 

src/cortex-tui/src/modal/mcp_manager/types.rs

@@ -112,6 +112,8 @@ pub enum McpMode {
         command: String,
         args: String,
         focus: AddStdioServerFocus,
+        /// Submission error message (e.g., when required fields are empty)
+        error: Option<String>,
     },
     /// Step 3b: Adding an HTTP server
     AddHttpServer {