diff --git a/web/src/pages/ChatPage.tsx b/web/src/pages/ChatPage.tsx
index 0d092c72c04..6fd32fa43fc 100644
--- a/web/src/pages/ChatPage.tsx
+++ b/web/src/pages/ChatPage.tsx
@@ -286,6 +286,17 @@ export default function ChatPage({ isActive = true }: { isActive?: boolean }) {
       fontWeight: "400",
       fontWeightBold: "700",
       macOptionIsMeta: true,
+      // Hold Option (Alt on Linux/Windows) to force native text selection
+      // even when the inner Hermes TUI has enabled xterm mouse-events
+      // mode (CSI ?1000h family). Without this, click-and-drag in the
+      // chat canvas selects nothing and Cmd+C falls back to copying the
+      // entire visible buffer, which is rarely what the user wants.
+      // See #25720.
+      macOptionClickForcesSelection: true,
+      // Right-click selects the word under the pointer. xterm.js default
+      // is false; enabling it gives users a single-action selection
+      // path on top of the modifier-based bypass above.
+      rightClickSelectsWord: true,
       // Single-scroll-system experiment:
       // let the inner Hermes TUI own transcript history/scroll behavior.
       // The outer browser xterm should act as a display/input bridge only.