fix(cli): copy uses OSC52 only in SSH/WSL (#16554)

Signed-off-by: assagman <ahmetsercansagman@gmail.com>

docs/cli/commands.md

@@ -73,6 +73,9 @@ Slash commands provide meta-level control over the CLI itself.
 - **`/copy`**
   - **Description:** Copies the last output produced by Gemini CLI to your
     clipboard, for easy sharing or reuse.
+  - **Behavior:**
+    - Local sessions use system clipboard tools (pbcopy/xclip/clip).
+    - Remote sessions (SSH/WSL) use OSC 52 and require terminal support.
   - **Note:** This command requires platform-specific clipboard tools to be
     installed.
     - On Linux, it requires `xclip` or `xsel`. You can typically install them

packages/cli/src/ui/utils/commandUtils.test.ts

@@ -239,11 +239,12 @@ describe('commandUtils', () => {
       expect(mockClipboardyWrite).not.toHaveBeenCalled();
     });
 
-    it('wraps OSC-52 for tmux', async () => {
+    it('wraps OSC-52 for tmux when in SSH', async () => {
       const testText = 'tmux-copy';
       const tty = makeWritable({ isTTY: true });
       mockFs.createWriteStream.mockReturnValue(tty);
 
+      process.env['SSH_CONNECTION'] = '1';
       process.env['TMUX'] = '1';
 
       await copyToClipboard(testText);
@@ -257,12 +258,13 @@ describe('commandUtils', () => {
       expect(mockClipboardyWrite).not.toHaveBeenCalled();
     });
 
-    it('wraps OSC-52 for GNU screen with chunked DCS', async () => {
+    it('wraps OSC-52 for GNU screen with chunked DCS when in SSH', async () => {
       // ensure payload > chunk size (240) so there are multiple chunks
       const testText = 'x'.repeat(1200);
       const tty = makeWritable({ isTTY: true });
       mockFs.createWriteStream.mockReturnValue(tty);
 
+      process.env['SSH_CONNECTION'] = '1';
       process.env['STY'] = 'screen-session';
 
       await copyToClipboard(testText);
@@ -358,6 +360,21 @@ describe('commandUtils', () => {
       expect(tty.end).not.toHaveBeenCalled();
     });
 
+    it('uses clipboardy in tmux when not in SSH/WSL', async () => {
+      const tty = makeWritable({ isTTY: true });
+      mockFs.createWriteStream.mockReturnValue(tty);
+      const text = 'tmux-local';
+      mockClipboardyWrite.mockResolvedValue(undefined);
+
+      process.env['TMUX'] = '1';
+
+      await copyToClipboard(text);
+
+      expect(mockClipboardyWrite).toHaveBeenCalledWith(text);
+      expect(tty.write).not.toHaveBeenCalled();
+      expect(tty.end).not.toHaveBeenCalled();
+    });
+
     it('skips /dev/tty on Windows and uses stderr fallback for OSC-52', async () => {
       mockProcess.platform = 'win32';
       const stderrStream = makeWritable({ isTTY: true });

packages/cli/src/ui/utils/commandUtils.ts

@@ -113,9 +113,7 @@ const isWSL = (): boolean =>
 const isDumbTerm = (): boolean => (process.env['TERM'] ?? '') === 'dumb';
 
 const shouldUseOsc52 = (tty: TtyTarget): boolean =>
-  Boolean(tty) &&
+  Boolean(tty) && !isDumbTerm() && (isSSH() || isWSL());
-  !isDumbTerm() &&
-  (isSSH() || inTmux() || inScreen() || isWSL());
 
 const safeUtf8Truncate = (buf: Buffer, maxBytes: number): Buffer => {
   if (buf.length <= maxBytes) return buf;