feat: add --mcp-type option for remote MCP servers

Auto-detects connection type from URL (/sse -> sse, /mcp -> streamable_http)
or allows manual specification. Updates goose plugin to use actual MCP type
instead of hardcoded sse.

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

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

cubbi/cli.py

@@ -1573,6 +1573,11 @@ def add_mcp(
 def add_remote_mcp(
     name: str = typer.Argument(..., help="MCP server name"),
     url: str = typer.Argument(..., help="URL of the remote MCP server"),
+    mcp_type: str = typer.Option(
+        "auto",
+        "--mcp-type",
+        help="MCP connection type: sse, streamable_http, stdio, or auto (default: auto)",
+    ),
     header: List[str] = typer.Option(
         [], "--header", "-H", help="HTTP headers (format: KEY=VALUE)"
     ),
@@ -1581,6 +1586,22 @@ def add_remote_mcp(
     ),
 ) -> None:
     """Add a remote MCP server"""
+    if mcp_type == "auto":
+        if url.endswith("/sse"):
+            mcp_type = "sse"
+        elif url.endswith("/mcp"):
+            mcp_type = "streamable_http"
+        else:
+            console.print(
+                f"[red]Cannot auto-detect MCP type from URL '{url}'. Please specify --mcp-type (sse, streamable_http, or stdio)[/red]"
+            )
+            return
+    elif mcp_type not in ["sse", "streamable_http", "stdio"]:
+        console.print(
+            f"[red]Invalid MCP type '{mcp_type}'. Must be: sse, streamable_http, stdio, or auto[/red]"
+        )
+        return
+
     # Parse headers
     headers = {}
     for h in header:
@@ -1595,7 +1616,7 @@ def add_remote_mcp(
     try:
         with console.status(f"Adding remote MCP server '{name}'..."):
             mcp_manager.add_remote_mcp(
-                name, url, headers, add_as_default=not no_default
+                name, url, headers, mcp_type=mcp_type, add_as_default=not no_default
             )
 
         console.print(f"[green]Added remote MCP server '{name}'[/green]")

cubbi/container.py

@@ -443,7 +443,7 @@ class ContainerManager:
                         )
 
                     # Set type-specific information
-                    env_vars[f"MCP_{idx}_TYPE"] = "remote"
+                    env_vars[f"MCP_{idx}_TYPE"] = mcp_config.get("mcp_type", "sse")
                     env_vars[f"MCP_{idx}_NAME"] = mcp_name
 
             # Set environment variables for MCP count if we have any

cubbi/images/goose/goose_plugin.py

@@ -171,7 +171,7 @@ class GoosePlugin(ToolPlugin):
                     "enabled": True,
                     "name": server_name,
                     "timeout": 60,
-                    "type": "sse",
+                    "type": server.get("type", "sse"),
                     "uri": mcp_url,
                     "envs": {},
                 }
@@ -184,7 +184,7 @@ class GoosePlugin(ToolPlugin):
                     "enabled": True,
                     "name": server_name,
                     "timeout": 60,
-                    "type": "sse",
+                    "type": server.get("type", "sse"),
                     "uri": server_url,
                     "envs": {},
                 }

cubbi/mcp.py

@@ -79,6 +79,7 @@ class MCPManager:
         name: str,
         url: str,
         headers: Dict[str, str] = None,
+        mcp_type: Optional[str] = None,
         add_as_default: bool = True,
     ) -> Dict[str, Any]:
         """Add a remote MCP server.
@@ -97,6 +98,7 @@ class MCPManager:
             name=name,
             url=url,
             headers=headers or {},
+            mcp_type=mcp_type,
         )
 
         # Add to the configuration

cubbi/models.py

@@ -61,6 +61,7 @@ class RemoteMCP(BaseModel):
     type: str = "remote"
     url: str
     headers: Dict[str, str] = Field(default_factory=dict)
+    mcp_type: Optional[str] = None
 
 
 class DockerMCP(BaseModel):