Add multiuser support to screen server

- Add enable_multiuser tool to enable multiuser mode on sessions
- Add attach_multiuser tool to provide attach instructions
- Add add_user tool for access control list management
- Peek functionality works seamlessly with multiuser sessions
- Create comprehensive test for multiuser functionality
- All existing functionality preserved and tested

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

mcp_servers/screen/screen_server.py

@@ -115,6 +115,62 @@ class ScreenServer(BaseMCPServer):
                 "required": ["session"]
             }
         )
+        
+        # Enable multiuser mode
+        self.register_tool(
+            name="enable_multiuser",
+            description="Enable multiuser mode for a screen session",
+            input_schema={
+                "type": "object",
+                "properties": {
+                    "session": {
+                        "type": "string",
+                        "description": "Name of the screen session"
+                    }
+                },
+                "required": ["session"]
+            }
+        )
+        
+        # Attach to multiuser session
+        self.register_tool(
+            name="attach_multiuser",
+            description="Attach to a multiuser screen session (for external use)",
+            input_schema={
+                "type": "object",
+                "properties": {
+                    "session": {
+                        "type": "string",
+                        "description": "Name of the screen session"
+                    },
+                    "user": {
+                        "type": "string",
+                        "description": "Optional username for access control"
+                    }
+                },
+                "required": ["session"]
+            }
+        )
+        
+        # Add user to multiuser session
+        self.register_tool(
+            name="add_user",
+            description="Add a user to a multiuser screen session",
+            input_schema={
+                "type": "object",
+                "properties": {
+                    "session": {
+                        "type": "string",
+                        "description": "Name of the screen session"
+                    },
+                    "user": {
+                        "type": "string",
+                        "description": "Username to add"
+                    }
+                },
+                "required": ["session", "user"]
+            }
+        )
     
     async def handle_tool_call(self, tool_name: str, arguments: Dict[str, Any]) -> Dict[str, Any]:
         """Handle screen tool calls."""
@@ -129,6 +185,12 @@ class ScreenServer(BaseMCPServer):
             return await self._list_sessions()
         elif tool_name == "kill_session":
             return await self._kill_session(arguments)
+        elif tool_name == "enable_multiuser":
+            return await self._enable_multiuser(arguments)
+        elif tool_name == "attach_multiuser":
+            return await self._attach_multiuser(arguments)
+        elif tool_name == "add_user":
+            return await self._add_user(arguments)
         else:
             raise Exception(f"Unknown tool: {tool_name}")
     
@@ -259,6 +321,51 @@ class ScreenServer(BaseMCPServer):
         else:
             return self.content_text(f"Failed to kill session: {result.stderr}")
     
+    async def _enable_multiuser(self, args: Dict[str, Any]) -> Dict[str, Any]:
+        """Enable multiuser mode for a screen session."""
+        session = args["session"]
+        
+        # Enable multiuser mode
+        cmd = ["screen", "-S", session, "-X", "multiuser", "on"]
+        result = await self._run_command(cmd)
+        
+        if result.returncode == 0:
+            return self.content_text(f"Enabled multiuser mode for session '{session}'")
+        else:
+            return self.content_text(f"Failed to enable multiuser mode: {result.stderr}")
+    
+    async def _attach_multiuser(self, args: Dict[str, Any]) -> Dict[str, Any]:
+        """Provide instructions for attaching to a multiuser session."""
+        session = args["session"]
+        user = args.get("user", "")
+        
+        # Check if session exists and is multiuser
+        check_result = await self._run_command(["screen", "-ls", session])
+        if session not in check_result.stdout:
+            return self.content_text(f"Session '{session}' not found")
+        
+        # Provide attach command
+        if user:
+            attach_cmd = f"screen -x {user}/{session}"
+        else:
+            attach_cmd = f"screen -x {session}"
+        
+        return self.content_text(f"To attach to multiuser session '{session}', run: {attach_cmd}")
+    
+    async def _add_user(self, args: Dict[str, Any]) -> Dict[str, Any]:
+        """Add a user to a multiuser screen session."""
+        session = args["session"]
+        user = args["user"]
+        
+        # Add user to session access control list
+        cmd = ["screen", "-S", session, "-X", "acladd", user]
+        result = await self._run_command(cmd)
+        
+        if result.returncode == 0:
+            return self.content_text(f"Added user '{user}' to session '{session}'")
+        else:
+            return self.content_text(f"Failed to add user: {result.stderr}")
+    
     async def _run_command(self, cmd: List[str]) -> subprocess.CompletedProcess:
         """Run a command and return the result."""
         return await asyncio.to_thread(

test_screen_multiuser.py

@@ -0,0 +1,172 @@
+#!/usr/bin/env python3
+"""Test multiuser functionality in screen server."""
+
+import asyncio
+import json
+import sys
+import os
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+from mcp_browser import MCPBrowser
+
+
+async def test_screen_multiuser():
+    """Test screen multiuser session functionality."""
+    browser = MCPBrowser(enable_builtin_servers=True)
+    
+    await browser.initialize()
+    
+    print("=== Testing Screen Multiuser Functionality ===\n")
+    
+    # Create a test session
+    print("1. Creating test session...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 1,
+        "method": "tools/call",
+        "params": {
+            "name": "create_session",
+            "arguments": {
+                "name": "multiuser-test",
+                "command": "bash"
+            }
+        }
+    })
+    print(f"   Result: {response.get('result', {}).get('content', [{}])[0].get('text', 'Error')}")
+    
+    # Enable multiuser mode
+    print("\n2. Enabling multiuser mode...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 2,
+        "method": "tools/call",
+        "params": {
+            "name": "enable_multiuser",
+            "arguments": {
+                "session": "multiuser-test"
+            }
+        }
+    })
+    print(f"   Result: {response.get('result', {}).get('content', [{}])[0].get('text', 'Error')}")
+    
+    # Add a user to the session
+    print("\n3. Adding user to session...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 3,
+        "method": "tools/call",
+        "params": {
+            "name": "add_user",
+            "arguments": {
+                "session": "multiuser-test",
+                "user": "testuser"
+            }
+        }
+    })
+    print(f"   Result: {response.get('result', {}).get('content', [{}])[0].get('text', 'Error')}")
+    
+    # Get attach instructions
+    print("\n4. Getting attach instructions...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 4,
+        "method": "tools/call",
+        "params": {
+            "name": "attach_multiuser",
+            "arguments": {
+                "session": "multiuser-test",
+                "user": "testuser"
+            }
+        }
+    })
+    print(f"   Result: {response.get('result', {}).get('content', [{}])[0].get('text', 'Error')}")
+    
+    # Execute a command in the multiuser session
+    print("\n5. Executing command in multiuser session...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 5,
+        "method": "tools/call",
+        "params": {
+            "name": "execute",
+            "arguments": {
+                "session": "multiuser-test",
+                "command": "echo 'Multiuser session test - Hello World!'"
+            }
+        }
+    })
+    print(f"   Result: {response.get('result', {}).get('content', [{}])[0].get('text', 'Error')}")
+    
+    # Wait a moment for output
+    await asyncio.sleep(0.5)
+    
+    # Test peek functionality with multiuser session
+    print("\n6. Testing peek with multiuser session...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 6,
+        "method": "tools/call",
+        "params": {
+            "name": "peek",
+            "arguments": {
+                "session": "multiuser-test",
+                "lines": 10
+            }
+        }
+    })
+    
+    if "result" in response:
+        output = response["result"]["content"][0]["text"]
+        print(f"   Output:\n{output}")
+        
+        # Check if we can see the executed command output
+        if "Multiuser session test" in output:
+            print("\n✓ Peek works correctly with multiuser session!")
+        else:
+            print("\n⚠ Peek output might not show recent commands")
+    else:
+        print(f"   Error: {response}")
+    
+    # List sessions to see multiuser status
+    print("\n7. Listing sessions...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 7,
+        "method": "tools/call",
+        "params": {
+            "name": "list_sessions",
+            "arguments": {}
+        }
+    })
+    
+    if "result" in response:
+        sessions_output = response["result"]["content"][0]["text"]
+        print(f"   Sessions:\n{sessions_output}")
+        
+        # Check if multiuser session is listed
+        if "multiuser-test" in sessions_output:
+            print("\n✓ Multiuser session is listed!")
+        else:
+            print("\n⚠ Session not found in list")
+    else:
+        print(f"   Error: {response}")
+    
+    # Clean up
+    print("\n8. Cleaning up...")
+    response = await browser.call({
+        "jsonrpc": "2.0",
+        "id": 8,
+        "method": "tools/call",
+        "params": {
+            "name": "kill_session",
+            "arguments": {"session": "multiuser-test"}
+        }
+    })
+    print(f"   Result: {response.get('result', {}).get('content', [{}])[0].get('text', 'Error')}")
+    
+    await browser.close()
+
+
+if __name__ == "__main__":
+    asyncio.run(test_screen_multiuser())