diff --git a/README.md b/README.md
index b6a8a7d..8f4296d 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,15 @@ cubbi session connect SESSION_ID
 # Close a session when done
 cubbi session close SESSION_ID
 
+# Close a session quickly (kill instead of graceful stop)
+cubbi session close SESSION_ID --kill
+
+# Close all sessions at once
+cubbi session close --all
+
+# Close all sessions quickly
+cubbi session close --all --kill
+
 # Create a session with a specific image
 cubbix --image goose
 cubbix --image opencode
@@ -93,6 +102,11 @@ cubbix -v ~/data:/data -v ./configs:/etc/app/config
 cubbix .
 cubbix /path/to/project
 
+# Forward ports from container to host
+cubbix --port 8000                    # Forward port 8000
+cubbix --port 8000,3000,5173         # Forward multiple ports (comma-separated)
+cubbix --port 8000 --port 3000       # Forward multiple ports (repeated flag)
+
 # Connect to external Docker networks
 cubbix --network teamnet --network dbnet
 
@@ -235,6 +249,26 @@ cubbi config volume remove /local/path
 
 Default volumes will be combined with any volumes specified using the `-v` flag when creating a session.
 
+### Default Ports Configuration
+
+You can configure default ports that will be automatically forwarded in every new session:
+
+```bash
+# List default ports
+cubbi config port list
+
+# Add a single port to defaults
+cubbi config port add 8000
+
+# Add multiple ports to defaults (comma-separated)
+cubbi config port add 8000,3000,5173
+
+# Remove a port from defaults
+cubbi config port remove 8000
+```
+
+Default ports will be combined with any ports specified using the `--port` flag when creating a session.
+
 ### Default MCP Servers Configuration
 
 You can configure default MCP servers that sessions will automatically connect to:
diff --git a/cubbi/cli.py b/cubbi/cli.py
index 81802b3..d550a63 100644
--- a/cubbi/cli.py
+++ b/cubbi/cli.py
@@ -142,6 +142,11 @@ def create_session(
     network: List[str] = typer.Option(
         [], "--network", "-N", help="Connect to additional Docker networks"
     ),
+    port: List[str] = typer.Option(
+        [],
+        "--port",
+        help="Forward ports (e.g., '8000' or '8000,3000' or multiple --port flags)",
+    ),
     name: Optional[str] = typer.Option(None, "--name", "-n", help="Session name"),
     run_command: Optional[str] = typer.Option(
         None,
@@ -319,6 +324,35 @@ def create_session(
             "[yellow]Warning: --domains cannot be used with --network. Network restrictions will take precedence.[/yellow]"
         )
 
+    # Get default ports from user config
+    default_ports = temp_user_config.get("defaults.ports", [])
+
+    # Parse and combine ports from command line
+    session_ports = []
+    for port_arg in port:
+        try:
+            parsed_ports = [int(p.strip()) for p in port_arg.split(",")]
+
+            # Validate port ranges
+            invalid_ports = [p for p in parsed_ports if not (1 <= p <= 65535)]
+            if invalid_ports:
+                console.print(
+                    f"[red]Error: Invalid ports {invalid_ports}. Ports must be between 1 and 65535[/red]"
+                )
+                return
+
+            session_ports.extend(parsed_ports)
+        except ValueError:
+            console.print(
+                f"[yellow]Warning: Ignoring invalid port format: {port_arg}. Use integers only.[/yellow]"
+            )
+
+    # Combine default ports with session ports, removing duplicates
+    all_ports = list(set(default_ports + session_ports))
+
+    if all_ports:
+        console.print(f"Forwarding ports: {', '.join(map(str, all_ports))}")
+
     # Get default MCPs from user config if none specified
     all_mcps = mcp if isinstance(mcp, list) else []
     if not all_mcps:
@@ -372,6 +406,7 @@ def create_session(
             mount_local=mount_local,
             volumes=volume_mounts,
             networks=all_networks,
+            ports=all_ports,
             mcp=all_mcps,
             run_command=run_command,
             no_shell=no_shell,
@@ -457,6 +492,9 @@ def create_session(
 def close_session(
     session_id: Optional[str] = typer.Argument(None, help="Session ID to close"),
     all_sessions: bool = typer.Option(False, "--all", help="Close all active sessions"),
+    kill: bool = typer.Option(
+        False, "--kill", help="Forcefully kill containers instead of graceful stop"
+    ),
 ) -> None:
     """Close a Cubbi session or all sessions"""
     if all_sessions:
@@ -480,7 +518,9 @@ def close_session(
                 )
 
         # Start closing sessions with progress updates
-        count, success = container_manager.close_all_sessions(update_progress)
+        count, success = container_manager.close_all_sessions(
+            update_progress, kill=kill
+        )
 
         # Final result
         if success:
@@ -489,7 +529,7 @@ def close_session(
             console.print("[red]Failed to close all sessions[/red]")
     elif session_id:
         with console.status(f"Closing session {session_id}..."):
-            success = container_manager.close_session(session_id)
+            success = container_manager.close_session(session_id, kill=kill)
 
         if success:
             console.print(f"[green]Session {session_id} closed successfully[/green]")
@@ -711,6 +751,10 @@ config_app.add_typer(network_app, name="network", no_args_is_help=True)
 volume_app = typer.Typer(help="Manage default volumes")
 config_app.add_typer(volume_app, name="volume", no_args_is_help=True)
 
+# Create a port subcommand for config
+port_app = typer.Typer(help="Manage default ports")
+config_app.add_typer(port_app, name="port", no_args_is_help=True)
+
 # Create an MCP subcommand for config
 config_mcp_app = typer.Typer(help="Manage default MCP servers")
 config_app.add_typer(config_mcp_app, name="mcp", no_args_is_help=True)
@@ -1021,6 +1065,91 @@ def remove_volume(
     console.print(f"[green]Removed volume '{volume_to_remove}' from defaults[/green]")
 
 
+# Port configuration commands
+@port_app.command("list")
+def list_ports() -> None:
+    """List all default ports"""
+    ports = user_config.get("defaults.ports", [])
+
+    if not ports:
+        console.print("No default ports configured")
+        return
+
+    table = Table(show_header=True, header_style="bold")
+    table.add_column("Port")
+
+    for port in ports:
+        table.add_row(str(port))
+
+    console.print(table)
+
+
+@port_app.command("add")
+def add_port(
+    ports_arg: str = typer.Argument(
+        ..., help="Port(s) to add to defaults (e.g., '8000' or '8000,3000,5173')"
+    ),
+) -> None:
+    """Add port(s) to default ports"""
+    current_ports = user_config.get("defaults.ports", [])
+
+    # Parse ports (support comma-separated)
+    try:
+        if "," in ports_arg:
+            new_ports = [int(p.strip()) for p in ports_arg.split(",")]
+        else:
+            new_ports = [int(ports_arg)]
+    except ValueError:
+        console.print(
+            "[red]Error: Invalid port format. Use integers only (e.g., '8000' or '8000,3000')[/red]"
+        )
+        return
+
+    # Validate port ranges
+    invalid_ports = [p for p in new_ports if not (1 <= p <= 65535)]
+    if invalid_ports:
+        console.print(
+            f"[red]Error: Invalid ports {invalid_ports}. Ports must be between 1 and 65535[/red]"
+        )
+        return
+
+    # Add new ports, avoiding duplicates
+    added_ports = []
+    for port in new_ports:
+        if port not in current_ports:
+            current_ports.append(port)
+            added_ports.append(port)
+
+    if not added_ports:
+        if len(new_ports) == 1:
+            console.print(f"Port {new_ports[0]} is already in defaults")
+        else:
+            console.print(f"All ports {new_ports} are already in defaults")
+        return
+
+    user_config.set("defaults.ports", current_ports)
+    if len(added_ports) == 1:
+        console.print(f"[green]Added port {added_ports[0]} to defaults[/green]")
+    else:
+        console.print(f"[green]Added ports {added_ports} to defaults[/green]")
+
+
+@port_app.command("remove")
+def remove_port(
+    port: int = typer.Argument(..., help="Port to remove from defaults"),
+) -> None:
+    """Remove a port from default ports"""
+    ports = user_config.get("defaults.ports", [])
+
+    if port not in ports:
+        console.print(f"Port {port} is not in defaults")
+        return
+
+    ports.remove(port)
+    user_config.set("defaults.ports", ports)
+    console.print(f"[green]Removed port {port} from defaults[/green]")
+
+
 # MCP Management Commands
 
 
diff --git a/cubbi/container.py b/cubbi/container.py
index d66482f..b0786ed 100644
--- a/cubbi/container.py
+++ b/cubbi/container.py
@@ -154,6 +154,7 @@ class ContainerManager:
         mount_local: bool = False,
         volumes: Optional[Dict[str, Dict[str, str]]] = None,
         networks: Optional[List[str]] = None,
+        ports: Optional[List[int]] = None,
         mcp: Optional[List[str]] = None,
         run_command: Optional[str] = None,
         no_shell: bool = False,
@@ -634,9 +635,12 @@ class ContainerManager:
                 },
                 "command": container_command,  # Set the command
                 "entrypoint": entrypoint,  # Set the entrypoint (might be None)
-                "ports": {f"{port}/tcp": None for port in image.ports},
             }
 
+            # Add port forwarding if ports are specified
+            if ports:
+                container_params["ports"] = {f"{port}/tcp": None for port in ports}
+
             # Use network_mode if domains are specified, otherwise use regular network
             if network_mode:
                 container_params["network_mode"] = network_mode
@@ -773,13 +777,18 @@ class ContainerManager:
 
             return None
 
-    def close_session(self, session_id: str) -> bool:
-        """Close a Cubbi session"""
+    def close_session(self, session_id: str, kill: bool = False) -> bool:
+        """Close a Cubbi session
+
+        Args:
+            session_id: The ID of the session to close
+            kill: If True, forcefully kill the container instead of graceful stop
+        """
         try:
             sessions = self.list_sessions()
             for session in sessions:
                 if session.id == session_id:
-                    return self._close_single_session(session)
+                    return self._close_single_session(session, kill=kill)
 
             print(f"Session '{session_id}' not found")
             return False
@@ -856,11 +865,12 @@ class ContainerManager:
             print(f"Error connecting to session: {e}")
             return False
 
-    def _close_single_session(self, session: Session) -> bool:
+    def _close_single_session(self, session: Session, kill: bool = False) -> bool:
         """Close a single session (helper for parallel processing)
 
         Args:
             session: The session to close
+            kill: If True, forcefully kill the container instead of graceful stop
 
         Returns:
             bool: Whether the session was successfully closed
@@ -871,7 +881,10 @@ class ContainerManager:
         try:
             # First, close the main session container
             container = self.client.containers.get(session.container_id)
-            container.stop()
+            if kill:
+                container.kill()
+            else:
+                container.stop()
             container.remove()
 
             # Check for and close any associated network-filter container
@@ -881,7 +894,10 @@ class ContainerManager:
                     network_filter_name
                 )
                 logger.info(f"Stopping network-filter container {network_filter_name}")
-                network_filter_container.stop()
+                if kill:
+                    network_filter_container.kill()
+                else:
+                    network_filter_container.stop()
                 network_filter_container.remove()
             except DockerException:
                 # Network-filter container might not exist, which is fine
@@ -893,12 +909,15 @@ class ContainerManager:
             print(f"Error closing session {session.id}: {e}")
             return False
 
-    def close_all_sessions(self, progress_callback=None) -> Tuple[int, bool]:
+    def close_all_sessions(
+        self, progress_callback=None, kill: bool = False
+    ) -> Tuple[int, bool]:
         """Close all Cubbi sessions with parallel processing and progress reporting
 
         Args:
             progress_callback: Optional callback function to report progress
                 The callback should accept (session_id, status, message)
+            kill: If True, forcefully kill containers instead of graceful stop
 
         Returns:
             tuple: (number of sessions closed, success)
@@ -918,7 +937,10 @@ class ContainerManager:
                 try:
                     container = self.client.containers.get(session.container_id)
                     # Stop and remove container
-                    container.stop()
+                    if kill:
+                        container.kill()
+                    else:
+                        container.stop()
                     container.remove()
 
                     # Check for and close any associated network-filter container
@@ -927,7 +949,10 @@ class ContainerManager:
                         network_filter_container = self.client.containers.get(
                             network_filter_name
                         )
-                        network_filter_container.stop()
+                        if kill:
+                            network_filter_container.kill()
+                        else:
+                            network_filter_container.stop()
                         network_filter_container.remove()
                     except DockerException:
                         # Network-filter container might not exist, which is fine
diff --git a/cubbi/images/aider/cubbi_image.yaml b/cubbi/images/aider/cubbi_image.yaml
index 42b6a8c..5452973 100644
--- a/cubbi/images/aider/cubbi_image.yaml
+++ b/cubbi/images/aider/cubbi_image.yaml
@@ -70,8 +70,6 @@ environment:
     description: HTTPS proxy server URL
     required: false
 
-ports: []
-
 volumes:
   - mountPath: /app
     description: Application directory
diff --git a/cubbi/images/claudecode/cubbi_image.yaml b/cubbi/images/claudecode/cubbi_image.yaml
index 2e858ea..873eacd 100644
--- a/cubbi/images/claudecode/cubbi_image.yaml
+++ b/cubbi/images/claudecode/cubbi_image.yaml
@@ -50,8 +50,6 @@ environment:
     required: false
     default: "false"
 
-ports: []
-
 volumes:
   - mountPath: /app
     description: Application directory
diff --git a/cubbi/images/crush/cubbi_image.yaml b/cubbi/images/crush/cubbi_image.yaml
index 95e429b..f2b8bb3 100644
--- a/cubbi/images/crush/cubbi_image.yaml
+++ b/cubbi/images/crush/cubbi_image.yaml
@@ -36,9 +36,6 @@ environment:
     description: AI provider to use with crush
     required: false
 
-ports:
-  - 8000
-
 volumes:
   - mountPath: /app
     description: Application directory
diff --git a/cubbi/images/goose/cubbi_image.yaml b/cubbi/images/goose/cubbi_image.yaml
index 9829f9e..d477863 100644
--- a/cubbi/images/goose/cubbi_image.yaml
+++ b/cubbi/images/goose/cubbi_image.yaml
@@ -24,9 +24,6 @@ environment:
     required: false
     default: https://cloud.langfuse.com
 
-ports:
-  - 8000
-
 volumes:
   - mountPath: /app
     description: Application directory
diff --git a/cubbi/images/opencode/cubbi_image.yaml b/cubbi/images/opencode/cubbi_image.yaml
index 3892aa7..d8ea0e4 100644
--- a/cubbi/images/opencode/cubbi_image.yaml
+++ b/cubbi/images/opencode/cubbi_image.yaml
@@ -9,8 +9,6 @@ init:
   command: /entrypoint.sh
 
 environment: []
-ports: []
-
 volumes:
   - mountPath: /app
     description: Application directory
diff --git a/cubbi/models.py b/cubbi/models.py
index c37a816..9c973e3 100644
--- a/cubbi/models.py
+++ b/cubbi/models.py
@@ -51,7 +51,6 @@ class Image(BaseModel):
     image: str
     init: Optional[ImageInit] = None
     environment: List[ImageEnvironmentVariable] = []
-    ports: List[int] = []
     volumes: List[VolumeMount] = []
     persistent_configs: List[PersistentConfig] = []
 
diff --git a/cubbi/user_config.py b/cubbi/user_config.py
index 78b4141..b1ac480 100644
--- a/cubbi/user_config.py
+++ b/cubbi/user_config.py
@@ -96,6 +96,7 @@ class UserConfigManager:
                 "mount_local": True,
                 "networks": [],  # Default networks to connect to (besides cubbi-network)
                 "volumes": [],  # Default volumes to mount, format: "source:dest"
+                "ports": [],  # Default ports to forward, format: list of integers
                 "mcps": [],  # Default MCP servers to connect to
                 "model": "claude-3-5-sonnet-latest",  # Default LLM model to use
                 "provider": "anthropic",  # Default LLM provider to use
diff --git a/tests/conftest.py b/tests/conftest.py
index df99af6..1678c45 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -2,17 +2,18 @@
 Common test fixtures for Cubbi Container tests.
 """
 
-import uuid
 import tempfile
-import pytest
-import docker
+import uuid
 from pathlib import Path
 from unittest.mock import patch
 
-from cubbi.container import ContainerManager
-from cubbi.session import SessionManager
+import docker
+import pytest
+
 from cubbi.config import ConfigManager
+from cubbi.container import ContainerManager
 from cubbi.models import Session, SessionStatus
+from cubbi.session import SessionManager
 from cubbi.user_config import UserConfigManager
 
 
@@ -41,13 +42,6 @@ requires_docker = pytest.mark.skipif(
 )
 
 
-@pytest.fixture
-def temp_dir():
-    """Create a temporary directory for test files."""
-    with tempfile.TemporaryDirectory() as tmp_dir:
-        yield Path(tmp_dir)
-
-
 @pytest.fixture
 def temp_config_dir():
     """Create a temporary directory for configuration files."""
@@ -56,76 +50,26 @@ def temp_config_dir():
 
 
 @pytest.fixture
-def isolated_config(temp_config_dir):
-    """Provide an isolated UserConfigManager instance."""
-    config_path = temp_config_dir / "config.yaml"
-    config_path.parent.mkdir(parents=True, exist_ok=True)
-    return UserConfigManager(str(config_path))
-
-
-@pytest.fixture
-def isolated_session_manager(temp_config_dir):
-    """Create an isolated session manager for testing."""
-    sessions_path = temp_config_dir / "sessions.yaml"
-    return SessionManager(sessions_path)
-
-
-@pytest.fixture
-def isolated_config_manager():
-    """Create an isolated config manager for testing."""
-    config_manager = ConfigManager()
-    # Ensure we're using the built-in images, not trying to load from user config
-    return config_manager
-
-
-@pytest.fixture
-def mock_session_manager():
-    """Mock the SessionManager class."""
-    with patch("cubbi.cli.session_manager") as mock_manager:
-        yield mock_manager
-
-
-@pytest.fixture
-def mock_container_manager():
-    """Mock the ContainerManager class with proper initialization."""
+def mock_container_manager(isolate_cubbi_config):
+    """Mock the ContainerManager class with proper behaviors for testing."""
     mock_session = Session(
         id="test-session-id",
         name="test-session",
         image="goose",
         status=SessionStatus.RUNNING,
-        ports={"8080": "8080"},
+        ports={8080: 32768},
     )
 
-    with patch("cubbi.cli.container_manager") as mock_manager:
-        # Set behaviors to avoid TypeErrors
-        mock_manager.list_sessions.return_value = []
-        mock_manager.create_session.return_value = mock_session
-        mock_manager.close_session.return_value = True
-        mock_manager.close_all_sessions.return_value = (3, True)
-        # MCP-related mocks
-        mock_manager.get_mcp_status.return_value = {
-            "status": "running",
-            "container_id": "test-id",
-        }
-        mock_manager.start_mcp.return_value = {
-            "status": "running",
-            "container_id": "test-id",
-        }
-        mock_manager.stop_mcp.return_value = True
-        mock_manager.restart_mcp.return_value = {
-            "status": "running",
-            "container_id": "test-id",
-        }
-        mock_manager.get_mcp_logs.return_value = "Test log output"
-        yield mock_manager
+    container_manager = isolate_cubbi_config["container_manager"]
 
-
-@pytest.fixture
-def container_manager(isolated_session_manager, isolated_config_manager):
-    """Create a container manager with isolated components."""
-    return ContainerManager(
-        config_manager=isolated_config_manager, session_manager=isolated_session_manager
-    )
+    # Patch the container manager methods for mocking
+    with (
+        patch.object(container_manager, "list_sessions", return_value=[]),
+        patch.object(container_manager, "create_session", return_value=mock_session),
+        patch.object(container_manager, "close_session", return_value=True),
+        patch.object(container_manager, "close_all_sessions", return_value=(3, True)),
+    ):
+        yield container_manager
 
 
 @pytest.fixture
@@ -137,28 +81,23 @@ def cli_runner():
 
 
 @pytest.fixture
-def test_file_content(temp_dir):
-    """Create a test file with content in the temporary directory."""
+def test_file_content(temp_config_dir):
+    """Create a test file with content in a temporary directory."""
     test_content = "This is a test file for volume mounting"
-    test_file = temp_dir / "test_volume_file.txt"
+    test_file = temp_config_dir / "test_volume_file.txt"
     with open(test_file, "w") as f:
         f.write(test_content)
     return test_file, test_content
 
 
 @pytest.fixture
-def test_network_name():
-    """Generate a unique network name for testing."""
-    return f"cubbi-test-network-{uuid.uuid4().hex[:8]}"
-
-
-@pytest.fixture
-def docker_test_network(test_network_name):
+def docker_test_network():
     """Create a Docker network for testing and clean it up after."""
     if not is_docker_available():
         pytest.skip("Docker is not available")
         return None
 
+    test_network_name = f"cubbi-test-network-{uuid.uuid4().hex[:8]}"
     client = docker.from_env()
     network = client.networks.create(test_network_name, driver="bridge")
 
@@ -172,8 +111,59 @@ def docker_test_network(test_network_name):
         pass
 
 
+@pytest.fixture(autouse=True, scope="function")
+def isolate_cubbi_config(temp_config_dir):
+    """
+    Automatically isolate all Cubbi configuration for every test.
+
+    This fixture ensures that tests never touch the user's real configuration
+    by patching both ConfigManager and UserConfigManager in cli.py to use
+    temporary directories.
+    """
+    # Create isolated config instances with temporary paths
+    config_path = temp_config_dir / "config.yaml"
+    user_config_path = temp_config_dir / "user_config.yaml"
+
+    # Create the ConfigManager with a custom config path
+    isolated_config_manager = ConfigManager(config_path)
+
+    # Create the UserConfigManager with a custom config path
+    isolated_user_config = UserConfigManager(str(user_config_path))
+
+    # Create isolated session manager
+    sessions_path = temp_config_dir / "sessions.yaml"
+    isolated_session_manager = SessionManager(sessions_path)
+
+    # Create isolated container manager
+    isolated_container_manager = ContainerManager(
+        isolated_config_manager, isolated_session_manager, isolated_user_config
+    )
+
+    # Patch all the global instances in cli.py and the UserConfigManager class
+    with (
+        patch("cubbi.cli.config_manager", isolated_config_manager),
+        patch("cubbi.cli.user_config", isolated_user_config),
+        patch("cubbi.cli.session_manager", isolated_session_manager),
+        patch("cubbi.cli.container_manager", isolated_container_manager),
+        patch("cubbi.cli.UserConfigManager", return_value=isolated_user_config),
+    ):
+        # Create isolated MCP manager with isolated user config
+        from cubbi.mcp import MCPManager
+
+        isolated_mcp_manager = MCPManager(config_manager=isolated_user_config)
+
+        # Patch the global mcp_manager instance
+        with patch("cubbi.cli.mcp_manager", isolated_mcp_manager):
+            yield {
+                "config_manager": isolated_config_manager,
+                "user_config": isolated_user_config,
+                "session_manager": isolated_session_manager,
+                "container_manager": isolated_container_manager,
+                "mcp_manager": isolated_mcp_manager,
+            }
+
+
 @pytest.fixture
-def patched_config_manager(isolated_config):
-    """Patch the UserConfigManager in cli.py to use our isolated instance."""
-    with patch("cubbi.cli.user_config", isolated_config):
-        yield isolated_config
+def patched_config_manager(isolate_cubbi_config):
+    """Compatibility fixture - returns the isolated user config."""
+    return isolate_cubbi_config["user_config"]
diff --git a/tests/test_config_commands.py b/tests/test_config_commands.py
index 419522f..e95fe45 100644
--- a/tests/test_config_commands.py
+++ b/tests/test_config_commands.py
@@ -189,4 +189,103 @@ def test_config_reset(cli_runner, patched_config_manager, monkeypatch):
     assert patched_config_manager.get("defaults.image") == "goose"
 
 
+def test_port_list_empty(cli_runner, patched_config_manager):
+    """Test listing ports when none are configured."""
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+
+    assert result.exit_code == 0
+    assert "No default ports configured" in result.stdout
+
+
+def test_port_add_single(cli_runner, patched_config_manager):
+    """Test adding a single port."""
+    result = cli_runner.invoke(app, ["config", "port", "add", "8000"])
+
+    assert result.exit_code == 0
+    assert "Added port 8000 to defaults" in result.stdout
+
+    # Verify it was added
+    ports = patched_config_manager.get("defaults.ports")
+    assert 8000 in ports
+
+
+def test_port_add_multiple(cli_runner, patched_config_manager):
+    """Test adding multiple ports with comma separation."""
+    result = cli_runner.invoke(app, ["config", "port", "add", "8000,3000,5173"])
+
+    assert result.exit_code == 0
+    assert "Added ports [8000, 3000, 5173] to defaults" in result.stdout
+
+    # Verify they were added
+    ports = patched_config_manager.get("defaults.ports")
+    assert 8000 in ports
+    assert 3000 in ports
+    assert 5173 in ports
+
+
+def test_port_add_duplicate(cli_runner, patched_config_manager):
+    """Test adding a port that already exists."""
+    # Add a port first
+    patched_config_manager.set("defaults.ports", [8000])
+
+    # Try to add the same port again
+    result = cli_runner.invoke(app, ["config", "port", "add", "8000"])
+
+    assert result.exit_code == 0
+    assert "Port 8000 is already in defaults" in result.stdout
+
+
+def test_port_add_invalid_format(cli_runner, patched_config_manager):
+    """Test adding an invalid port format."""
+    result = cli_runner.invoke(app, ["config", "port", "add", "invalid"])
+
+    assert result.exit_code == 0
+    assert "Error: Invalid port format" in result.stdout
+
+
+def test_port_add_invalid_range(cli_runner, patched_config_manager):
+    """Test adding a port outside valid range."""
+    result = cli_runner.invoke(app, ["config", "port", "add", "70000"])
+
+    assert result.exit_code == 0
+    assert "Error: Invalid ports [70000]" in result.stdout
+
+
+def test_port_list_with_ports(cli_runner, patched_config_manager):
+    """Test listing ports when some are configured."""
+    # Add some ports
+    patched_config_manager.set("defaults.ports", [8000, 3000])
+
+    # List ports
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+
+    assert result.exit_code == 0
+    assert "8000" in result.stdout
+    assert "3000" in result.stdout
+
+
+def test_port_remove(cli_runner, patched_config_manager):
+    """Test removing a port."""
+    # Add a port first
+    patched_config_manager.set("defaults.ports", [8000])
+
+    # Remove the port
+    result = cli_runner.invoke(app, ["config", "port", "remove", "8000"])
+
+    assert result.exit_code == 0
+    assert "Removed port 8000 from defaults" in result.stdout
+
+    # Verify it's gone
+    ports = patched_config_manager.get("defaults.ports")
+    assert 8000 not in ports
+
+
+def test_port_remove_not_found(cli_runner, patched_config_manager):
+    """Test removing a port that doesn't exist."""
+    result = cli_runner.invoke(app, ["config", "port", "remove", "8000"])
+
+    assert result.exit_code == 0
+    assert "Port 8000 is not in defaults" in result.stdout
+
+
 # patched_config_manager fixture is now in conftest.py
diff --git a/tests/test_config_isolation.py b/tests/test_config_isolation.py
new file mode 100644
index 0000000..72c06fd
--- /dev/null
+++ b/tests/test_config_isolation.py
@@ -0,0 +1,90 @@
+"""
+Test that configuration isolation works correctly and doesn't touch user's real config.
+"""
+
+from pathlib import Path
+from cubbi.cli import app
+
+
+def test_config_isolation_preserves_user_config(cli_runner, isolate_cubbi_config):
+    """Test that test isolation doesn't affect user's real configuration."""
+
+    # Get the user's real config path
+    real_config_path = Path.home() / ".config" / "cubbi" / "config.yaml"
+
+    # If the user has a real config, store its content before test
+    original_content = None
+    if real_config_path.exists():
+        with open(real_config_path, "r") as f:
+            original_content = f.read()
+
+    # Run some config modification commands in the test
+    result = cli_runner.invoke(app, ["config", "port", "add", "9999"])
+    assert result.exit_code == 0
+
+    result = cli_runner.invoke(app, ["config", "set", "defaults.image", "test-image"])
+    assert result.exit_code == 0
+
+    # Verify the user's real config is unchanged
+    if original_content is not None:
+        with open(real_config_path, "r") as f:
+            current_content = f.read()
+        assert current_content == original_content
+    else:
+        # If no real config existed, it should still not exist
+        assert not real_config_path.exists()
+
+
+def test_isolated_config_works_independently(cli_runner, isolate_cubbi_config):
+    """Test that the isolated config works correctly for tests."""
+
+    # Add a port to isolated config
+    result = cli_runner.invoke(app, ["config", "port", "add", "8888"])
+    assert result.exit_code == 0
+    assert "Added port 8888 to defaults" in result.stdout
+
+    # Verify it appears in the list
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+    assert result.exit_code == 0
+    assert "8888" in result.stdout
+
+    # Remove the port
+    result = cli_runner.invoke(app, ["config", "port", "remove", "8888"])
+    assert result.exit_code == 0
+    assert "Removed port 8888 from defaults" in result.stdout
+
+    # Verify it's gone
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+    assert result.exit_code == 0
+    assert "No default ports configured" in result.stdout
+
+
+def test_each_test_gets_fresh_config(cli_runner, isolate_cubbi_config):
+    """Test that each test gets a fresh, isolated configuration."""
+
+    # This test should start with empty ports (fresh config)
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+    assert result.exit_code == 0
+    assert "No default ports configured" in result.stdout
+
+    # Add a port
+    result = cli_runner.invoke(app, ["config", "port", "add", "7777"])
+    assert result.exit_code == 0
+
+    # Verify it's there
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+    assert result.exit_code == 0
+    assert "7777" in result.stdout
+
+
+def test_another_fresh_config_test(cli_runner, isolate_cubbi_config):
+    """Another test to verify each test gets a completely fresh config."""
+
+    # This test should also start with empty ports (independent of previous test)
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+    assert result.exit_code == 0
+    assert "No default ports configured" in result.stdout
+
+    # The port from the previous test should not be here
+    result = cli_runner.invoke(app, ["config", "port", "list"])
+    assert "7777" not in result.stdout
diff --git a/tests/test_integration_docker.py b/tests/test_integration_docker.py
index 5467722..0a7b450 100644
--- a/tests/test_integration_docker.py
+++ b/tests/test_integration_docker.py
@@ -6,6 +6,8 @@ These tests require Docker to be running.
 import subprocess
 import time
 import uuid
+import docker
+
 
 # Import the requires_docker decorator from conftest
 from conftest import requires_docker
@@ -21,13 +23,56 @@ def execute_command_in_container(container_id, command):
     return result.stdout.strip()
 
 
+def wait_for_container_init(container_id, timeout=5.0, poll_interval=0.1):
+    """
+    Wait for a Cubbi container to complete initialization by polling /cubbi/init.status.
+
+    Args:
+        container_id: Docker container ID
+        timeout: Maximum time to wait in seconds (default: 5.0)
+        poll_interval: Time between polls in seconds (default: 0.1)
+
+    Returns:
+        bool: True if initialization completed, False if timed out
+
+    Raises:
+        subprocess.CalledProcessError: If docker exec command fails
+    """
+    start_time = time.time()
+
+    while time.time() - start_time < timeout:
+        try:
+            # Check if /cubbi/init.status contains INIT_COMPLETE=true
+            result = execute_command_in_container(
+                container_id,
+                "grep -q 'INIT_COMPLETE=true' /cubbi/init.status 2>/dev/null && echo 'COMPLETE' || echo 'PENDING'",
+            )
+
+            if result == "COMPLETE":
+                return True
+
+        except subprocess.CalledProcessError:
+            # File might not exist yet or container not ready, continue polling
+            pass
+
+        time.sleep(poll_interval)
+
+    # Timeout reached
+    return False
+
+
 @requires_docker
-def test_integration_session_create_with_volumes(container_manager, test_file_content):
+def test_integration_session_create_with_volumes(
+    isolate_cubbi_config, test_file_content
+):
     """Test creating a session with a volume mount."""
     test_file, test_content = test_file_content
     session = None
 
     try:
+        # Get the isolated container manager
+        container_manager = isolate_cubbi_config["container_manager"]
+
         # Create a session with a volume mount
         session = container_manager.create_session(
             image_name="goose",
@@ -39,8 +84,9 @@ def test_integration_session_create_with_volumes(container_manager, test_file_co
         assert session is not None
         assert session.status == "running"
 
-        # Give container time to fully start
-        time.sleep(2)
+        # Wait for container initialization to complete
+        init_success = wait_for_container_init(session.container_id)
+        assert init_success, "Container initialization timed out"
 
         # Verify the file exists in the container and has correct content
         container_content = execute_command_in_container(
@@ -50,19 +96,22 @@ def test_integration_session_create_with_volumes(container_manager, test_file_co
         assert container_content == test_content
 
     finally:
-        # Clean up the container
+        # Clean up the container (use kill for faster test cleanup)
         if session and session.container_id:
-            container_manager.close_session(session.id)
+            container_manager.close_session(session.id, kill=True)
 
 
 @requires_docker
 def test_integration_session_create_with_networks(
-    container_manager, docker_test_network
+    isolate_cubbi_config, docker_test_network
 ):
     """Test creating a session connected to a custom network."""
     session = None
 
     try:
+        # Get the isolated container manager
+        container_manager = isolate_cubbi_config["container_manager"]
+
         # Create a session with the test network
         session = container_manager.create_session(
             image_name="goose",
@@ -74,8 +123,9 @@ def test_integration_session_create_with_networks(
         assert session is not None
         assert session.status == "running"
 
-        # Give container time to fully start
-        time.sleep(2)
+        # Wait for container initialization to complete
+        init_success = wait_for_container_init(session.container_id)
+        assert init_success, "Container initialization timed out"
 
         # Verify the container is connected to the test network
         # Use inspect to check network connections
@@ -97,6 +147,240 @@ def test_integration_session_create_with_networks(
         assert int(network_interfaces) >= 2
 
     finally:
-        # Clean up the container
+        # Clean up the container (use kill for faster test cleanup)
         if session and session.container_id:
-            container_manager.close_session(session.id)
+            container_manager.close_session(session.id, kill=True)
+
+
+@requires_docker
+def test_integration_session_create_with_ports(isolate_cubbi_config):
+    """Test creating a session with port forwarding."""
+    session = None
+
+    try:
+        # Get the isolated container manager
+        container_manager = isolate_cubbi_config["container_manager"]
+
+        # Create a session with port forwarding
+        session = container_manager.create_session(
+            image_name="goose",
+            session_name=f"cubbi-test-ports-{uuid.uuid4().hex[:8]}",
+            mount_local=False,  # Don't mount current directory
+            ports=[8080, 9000],  # Forward these ports
+        )
+
+        assert session is not None
+        assert session.status == "running"
+
+        # Verify ports are mapped
+        assert isinstance(session.ports, dict)
+        assert 8080 in session.ports
+        assert 9000 in session.ports
+
+        # Verify port mappings are valid (host ports should be assigned)
+        assert isinstance(session.ports[8080], int)
+        assert isinstance(session.ports[9000], int)
+        assert session.ports[8080] > 0
+        assert session.ports[9000] > 0
+
+        # Wait for container initialization to complete
+        init_success = wait_for_container_init(session.container_id)
+        assert init_success, "Container initialization timed out"
+
+        # Verify Docker port mappings using Docker client
+        import docker
+
+        client = docker.from_env()
+        container = client.containers.get(session.container_id)
+        container_ports = container.attrs["NetworkSettings"]["Ports"]
+
+        # Verify both ports are exposed
+        assert "8080/tcp" in container_ports
+        assert "9000/tcp" in container_ports
+
+        # Verify host port bindings exist
+        assert container_ports["8080/tcp"] is not None
+        assert container_ports["9000/tcp"] is not None
+        assert len(container_ports["8080/tcp"]) > 0
+        assert len(container_ports["9000/tcp"]) > 0
+
+        # Verify host ports match session.ports
+        host_port_8080 = int(container_ports["8080/tcp"][0]["HostPort"])
+        host_port_9000 = int(container_ports["9000/tcp"][0]["HostPort"])
+        assert session.ports[8080] == host_port_8080
+        assert session.ports[9000] == host_port_9000
+
+    finally:
+        # Clean up the container (use kill for faster test cleanup)
+        if session and session.container_id:
+            container_manager.close_session(session.id, kill=True)
+
+
+@requires_docker
+def test_integration_session_create_no_ports(isolate_cubbi_config):
+    """Test creating a session without port forwarding."""
+    session = None
+
+    try:
+        # Get the isolated container manager
+        container_manager = isolate_cubbi_config["container_manager"]
+
+        # Create a session without ports
+        session = container_manager.create_session(
+            image_name="goose",
+            session_name=f"cubbi-test-no-ports-{uuid.uuid4().hex[:8]}",
+            mount_local=False,  # Don't mount current directory
+            ports=[],  # No ports
+        )
+
+        assert session is not None
+        assert session.status == "running"
+
+        # Verify no ports are mapped
+        assert isinstance(session.ports, dict)
+        assert len(session.ports) == 0
+
+        # Wait for container initialization to complete
+        init_success = wait_for_container_init(session.container_id)
+        assert init_success, "Container initialization timed out"
+
+        # Verify Docker has no port mappings
+        import docker
+
+        client = docker.from_env()
+        container = client.containers.get(session.container_id)
+        container_ports = container.attrs["NetworkSettings"]["Ports"]
+
+        # Should have no port mappings (empty dict or None values)
+        for port_spec, bindings in container_ports.items():
+            assert bindings is None or len(bindings) == 0
+
+    finally:
+        # Clean up the container (use kill for faster test cleanup)
+        if session and session.container_id:
+            container_manager.close_session(session.id, kill=True)
+
+
+@requires_docker
+def test_integration_session_create_with_single_port(isolate_cubbi_config):
+    """Test creating a session with a single port forward."""
+    session = None
+
+    try:
+        # Get the isolated container manager
+        container_manager = isolate_cubbi_config["container_manager"]
+
+        # Create a session with single port
+        session = container_manager.create_session(
+            image_name="goose",
+            session_name=f"cubbi-test-single-port-{uuid.uuid4().hex[:8]}",
+            mount_local=False,  # Don't mount current directory
+            ports=[3000],  # Single port
+        )
+
+        assert session is not None
+        assert session.status == "running"
+
+        # Verify single port is mapped
+        assert isinstance(session.ports, dict)
+        assert len(session.ports) == 1
+        assert 3000 in session.ports
+        assert isinstance(session.ports[3000], int)
+        assert session.ports[3000] > 0
+
+        # Wait for container initialization to complete
+        init_success = wait_for_container_init(session.container_id)
+        assert init_success, "Container initialization timed out"
+
+        client = docker.from_env()
+        container = client.containers.get(session.container_id)
+        container_ports = container.attrs["NetworkSettings"]["Ports"]
+
+        # Should have exactly one port mapping
+        port_mappings = {
+            k: v for k, v in container_ports.items() if v is not None and len(v) > 0
+        }
+        assert len(port_mappings) == 1
+        assert "3000/tcp" in port_mappings
+
+    finally:
+        # Clean up the container (use kill for faster test cleanup)
+        if session and session.container_id:
+            container_manager.close_session(session.id, kill=True)
+
+
+@requires_docker
+def test_integration_kill_vs_stop_speed(isolate_cubbi_config):
+    """Test that kill is faster than stop for container termination."""
+    import time
+
+    # Get the isolated container manager
+    container_manager = isolate_cubbi_config["container_manager"]
+
+    # Create two identical sessions for comparison
+    session_stop = None
+    session_kill = None
+
+    try:
+        # Create first session (will be stopped gracefully)
+        session_stop = container_manager.create_session(
+            image_name="goose",
+            session_name=f"cubbi-test-stop-{uuid.uuid4().hex[:8]}",
+            mount_local=False,
+            ports=[],
+        )
+
+        # Create second session (will be killed)
+        session_kill = container_manager.create_session(
+            image_name="goose",
+            session_name=f"cubbi-test-kill-{uuid.uuid4().hex[:8]}",
+            mount_local=False,
+            ports=[],
+        )
+
+        assert session_stop is not None
+        assert session_kill is not None
+
+        # Wait for both containers to initialize
+        init_success_stop = wait_for_container_init(session_stop.container_id)
+        init_success_kill = wait_for_container_init(session_kill.container_id)
+        assert init_success_stop, "Stop test container initialization timed out"
+        assert init_success_kill, "Kill test container initialization timed out"
+
+        # Time graceful stop
+        start_time = time.time()
+        container_manager.close_session(session_stop.id, kill=False)
+        stop_time = time.time() - start_time
+        session_stop = None  # Mark as cleaned up
+
+        # Time kill
+        start_time = time.time()
+        container_manager.close_session(session_kill.id, kill=True)
+        kill_time = time.time() - start_time
+        session_kill = None  # Mark as cleaned up
+
+        # Kill should be faster than stop (usually by several seconds)
+        # We use a generous threshold since system performance can vary
+        assert (
+            kill_time < stop_time
+        ), f"Kill ({kill_time:.2f}s) should be faster than stop ({stop_time:.2f}s)"
+
+        # Verify both methods successfully closed the containers
+        # (containers should no longer be in the session list)
+        remaining_sessions = container_manager.list_sessions()
+        session_ids = [s.id for s in remaining_sessions]
+        assert session_stop.id if session_stop else "stop-session" not in session_ids
+        assert session_kill.id if session_kill else "kill-session" not in session_ids
+
+    finally:
+        # Clean up any remaining containers
+        if session_stop and session_stop.container_id:
+            try:
+                container_manager.close_session(session_stop.id, kill=True)
+            except Exception:
+                pass
+        if session_kill and session_kill.container_id:
+            try:
+                container_manager.close_session(session_kill.id, kill=True)
+            except Exception:
+                pass
diff --git a/tests/test_mcp_commands.py b/tests/test_mcp_commands.py
index 76e4679..71c10bf 100644
--- a/tests/test_mcp_commands.py
+++ b/tests/test_mcp_commands.py
@@ -21,7 +21,7 @@ def test_mcp_list_empty(cli_runner, patched_config_manager):
         assert "No MCP servers configured" in result.stdout
 
 
-def test_mcp_add_remote(cli_runner, patched_config_manager):
+def test_mcp_add_remote(cli_runner, isolate_cubbi_config):
     """Test adding a remote MCP server and listing it."""
     # Add a remote MCP server
     result = cli_runner.invoke(
@@ -49,7 +49,7 @@ def test_mcp_add_remote(cli_runner, patched_config_manager):
     assert "http://mcp-se" in result.stdout  # Truncated in table view
 
 
-def test_mcp_add(cli_runner, patched_config_manager):
+def test_mcp_add(cli_runner, isolate_cubbi_config):
     """Test adding a proxy-based MCP server and listing it."""
     # Add a Docker MCP server
     result = cli_runner.invoke(
@@ -350,10 +350,12 @@ def test_mcp_status(cli_runner, patched_config_manager, mock_container_manager):
 
 
 @pytest.mark.requires_docker
-def test_mcp_start(cli_runner, patched_config_manager, mock_container_manager):
+def test_mcp_start(cli_runner, isolate_cubbi_config):
     """Test starting an MCP server."""
+    mcp_manager = isolate_cubbi_config["mcp_manager"]
+
     # Add a Docker MCP
-    patched_config_manager.set(
+    isolate_cubbi_config["user_config"].set(
         "mcps",
         [
             {
@@ -365,25 +367,30 @@ def test_mcp_start(cli_runner, patched_config_manager, mock_container_manager):
         ],
     )
 
-    # Mock the start operation
-    mock_container_manager.start_mcp.return_value = {
-        "container_id": "test-container-id",
-        "status": "running",
-    }
+    # Mock the start_mcp method to avoid actual Docker operations
+    with patch.object(
+        mcp_manager,
+        "start_mcp",
+        return_value={
+            "container_id": "test-container-id",
+            "status": "running",
+        },
+    ):
+        # Start the MCP
+        result = cli_runner.invoke(app, ["mcp", "start", "test-docker-mcp"])
 
-    # Start the MCP
-    result = cli_runner.invoke(app, ["mcp", "start", "test-docker-mcp"])
-
-    assert result.exit_code == 0
-    assert "Started MCP server" in result.stdout
-    assert "test-docker-mcp" in result.stdout
+        assert result.exit_code == 0
+        assert "Started MCP server" in result.stdout
+        assert "test-docker-mcp" in result.stdout
 
 
 @pytest.mark.requires_docker
-def test_mcp_stop(cli_runner, patched_config_manager, mock_container_manager):
+def test_mcp_stop(cli_runner, isolate_cubbi_config):
     """Test stopping an MCP server."""
+    mcp_manager = isolate_cubbi_config["mcp_manager"]
+
     # Add a Docker MCP
-    patched_config_manager.set(
+    isolate_cubbi_config["user_config"].set(
         "mcps",
         [
             {
@@ -395,22 +402,23 @@ def test_mcp_stop(cli_runner, patched_config_manager, mock_container_manager):
         ],
     )
 
-    # Mock the stop operation
-    mock_container_manager.stop_mcp.return_value = True
+    # Mock the stop_mcp method to avoid actual Docker operations
+    with patch.object(mcp_manager, "stop_mcp", return_value=True):
+        # Stop the MCP
+        result = cli_runner.invoke(app, ["mcp", "stop", "test-docker-mcp"])
 
-    # Stop the MCP
-    result = cli_runner.invoke(app, ["mcp", "stop", "test-docker-mcp"])
-
-    assert result.exit_code == 0
-    assert "Stopped and removed MCP server" in result.stdout
-    assert "test-docker-mcp" in result.stdout
+        assert result.exit_code == 0
+        assert "Stopped and removed MCP server" in result.stdout
+        assert "test-docker-mcp" in result.stdout
 
 
 @pytest.mark.requires_docker
-def test_mcp_restart(cli_runner, patched_config_manager, mock_container_manager):
+def test_mcp_restart(cli_runner, isolate_cubbi_config):
     """Test restarting an MCP server."""
+    mcp_manager = isolate_cubbi_config["mcp_manager"]
+
     # Add a Docker MCP
-    patched_config_manager.set(
+    isolate_cubbi_config["user_config"].set(
         "mcps",
         [
             {
@@ -422,18 +430,21 @@ def test_mcp_restart(cli_runner, patched_config_manager, mock_container_manager)
         ],
     )
 
-    # Mock the restart operation
-    mock_container_manager.restart_mcp.return_value = {
-        "container_id": "test-container-id",
-        "status": "running",
-    }
+    # Mock the restart_mcp method to avoid actual Docker operations
+    with patch.object(
+        mcp_manager,
+        "restart_mcp",
+        return_value={
+            "container_id": "test-container-id",
+            "status": "running",
+        },
+    ):
+        # Restart the MCP
+        result = cli_runner.invoke(app, ["mcp", "restart", "test-docker-mcp"])
 
-    # Restart the MCP
-    result = cli_runner.invoke(app, ["mcp", "restart", "test-docker-mcp"])
-
-    assert result.exit_code == 0
-    assert "Restarted MCP server" in result.stdout
-    assert "test-docker-mcp" in result.stdout
+        assert result.exit_code == 0
+        assert "Restarted MCP server" in result.stdout
+        assert "test-docker-mcp" in result.stdout
 
 
 @pytest.mark.requires_docker
diff --git a/tests/test_session_commands.py b/tests/test_session_commands.py
index 06bb2b6..dcffdbd 100644
--- a/tests/test_session_commands.py
+++ b/tests/test_session_commands.py
@@ -83,7 +83,9 @@ def test_session_close(cli_runner, mock_container_manager):
 
     assert result.exit_code == 0
     assert "closed successfully" in result.stdout
-    mock_container_manager.close_session.assert_called_once_with("test-session-id")
+    mock_container_manager.close_session.assert_called_once_with(
+        "test-session-id", kill=False
+    )
 
 
 def test_session_close_all(cli_runner, mock_container_manager):
@@ -113,6 +115,197 @@ def test_session_close_all(cli_runner, mock_container_manager):
     mock_container_manager.close_all_sessions.assert_called_once()
 
 
+def test_session_create_with_ports(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session creation with port forwarding."""
+    from cubbi.models import Session, SessionStatus
+
+    # Mock the create_session to return a session with ports
+    mock_session = Session(
+        id="test-session-id",
+        name="test-session",
+        image="goose",
+        status=SessionStatus.RUNNING,
+        ports={8000: 32768, 3000: 32769},
+    )
+    mock_container_manager.create_session.return_value = mock_session
+
+    result = cli_runner.invoke(app, ["session", "create", "--port", "8000,3000"])
+
+    assert result.exit_code == 0
+    assert "Session created successfully" in result.stdout
+    assert "Forwarding ports: 8000, 3000" in result.stdout
+
+    # Verify create_session was called with correct ports
+    mock_container_manager.create_session.assert_called_once()
+    call_args = mock_container_manager.create_session.call_args
+    assert call_args.kwargs["ports"] == [8000, 3000]
+
+
+def test_session_create_with_default_ports(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session creation using default ports."""
+    from cubbi.models import Session, SessionStatus
+
+    # Set up default ports
+    patched_config_manager.set("defaults.ports", [8080, 9000])
+
+    # Mock the create_session to return a session with ports
+    mock_session = Session(
+        id="test-session-id",
+        name="test-session",
+        image="goose",
+        status=SessionStatus.RUNNING,
+        ports={8080: 32768, 9000: 32769},
+    )
+    mock_container_manager.create_session.return_value = mock_session
+
+    result = cli_runner.invoke(app, ["session", "create"])
+
+    assert result.exit_code == 0
+    assert "Session created successfully" in result.stdout
+    assert "Forwarding ports: 8080, 9000" in result.stdout
+
+    # Verify create_session was called with default ports
+    mock_container_manager.create_session.assert_called_once()
+    call_args = mock_container_manager.create_session.call_args
+    assert call_args.kwargs["ports"] == [8080, 9000]
+
+
+def test_session_create_combine_default_and_custom_ports(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session creation combining default and custom ports."""
+    from cubbi.models import Session, SessionStatus
+
+    # Set up default ports
+    patched_config_manager.set("defaults.ports", [8080])
+
+    # Mock the create_session to return a session with combined ports
+    mock_session = Session(
+        id="test-session-id",
+        name="test-session",
+        image="goose",
+        status=SessionStatus.RUNNING,
+        ports={8080: 32768, 3000: 32769},
+    )
+    mock_container_manager.create_session.return_value = mock_session
+
+    result = cli_runner.invoke(app, ["session", "create", "--port", "3000"])
+
+    assert result.exit_code == 0
+    assert "Session created successfully" in result.stdout
+    # Ports should be combined and deduplicated
+    assert "Forwarding ports:" in result.stdout
+
+    # Verify create_session was called with combined ports
+    mock_container_manager.create_session.assert_called_once()
+    call_args = mock_container_manager.create_session.call_args
+    # Should contain both default (8080) and custom (3000) ports
+    assert set(call_args.kwargs["ports"]) == {8080, 3000}
+
+
+def test_session_create_invalid_port_format(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session creation with invalid port format."""
+    result = cli_runner.invoke(app, ["session", "create", "--port", "invalid"])
+
+    assert result.exit_code == 0
+    assert "Warning: Ignoring invalid port format" in result.stdout
+
+    # Session creation should continue with empty ports list (invalid port ignored)
+    mock_container_manager.create_session.assert_called_once()
+    call_args = mock_container_manager.create_session.call_args
+    assert call_args.kwargs["ports"] == []  # Invalid port should be ignored
+
+
+def test_session_create_invalid_port_range(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session creation with port outside valid range."""
+    result = cli_runner.invoke(app, ["session", "create", "--port", "70000"])
+
+    assert result.exit_code == 0
+    assert "Error: Invalid ports [70000]" in result.stdout
+
+    # Session creation should not happen due to early return
+    mock_container_manager.create_session.assert_not_called()
+
+
+def test_session_list_shows_ports(cli_runner, mock_container_manager):
+    """Test that session list shows port mappings."""
+    from cubbi.models import Session, SessionStatus
+
+    mock_session = Session(
+        id="test-session-id",
+        name="test-session",
+        image="goose",
+        status=SessionStatus.RUNNING,
+        ports={8000: 32768, 3000: 32769},
+    )
+    mock_container_manager.list_sessions.return_value = [mock_session]
+
+    result = cli_runner.invoke(app, ["session", "list"])
+
+    assert result.exit_code == 0
+    assert "8000:32768" in result.stdout
+    assert "3000:32769" in result.stdout
+
+
+def test_session_close_with_kill_flag(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session close with --kill flag."""
+    result = cli_runner.invoke(app, ["session", "close", "test-session-id", "--kill"])
+
+    assert result.exit_code == 0
+
+    # Verify close_session was called with kill=True
+    mock_container_manager.close_session.assert_called_once_with(
+        "test-session-id", kill=True
+    )
+
+
+def test_session_close_all_with_kill_flag(
+    cli_runner, mock_container_manager, patched_config_manager
+):
+    """Test session close --all with --kill flag."""
+    from cubbi.models import Session, SessionStatus
+
+    # Mock some sessions to close
+    mock_sessions = [
+        Session(
+            id="session-1",
+            name="Session 1",
+            image="goose",
+            status=SessionStatus.RUNNING,
+            ports={},
+        ),
+        Session(
+            id="session-2",
+            name="Session 2",
+            image="goose",
+            status=SessionStatus.RUNNING,
+            ports={},
+        ),
+    ]
+    mock_container_manager.list_sessions.return_value = mock_sessions
+    mock_container_manager.close_all_sessions.return_value = (2, True)
+
+    result = cli_runner.invoke(app, ["session", "close", "--all", "--kill"])
+
+    assert result.exit_code == 0
+    assert "2 sessions closed successfully" in result.stdout
+
+    # Verify close_all_sessions was called with kill=True
+    mock_container_manager.close_all_sessions.assert_called_once()
+    call_args = mock_container_manager.close_all_sessions.call_args
+    assert call_args.kwargs["kill"] is True
+
+
 # For more complex tests that need actual Docker,
 # we've implemented them in test_integration_docker.py
 # They will run automatically if Docker is available