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fix: better cli error when missing mcp dep #6859

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merged 1 commit into from
Oct 21, 2025
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fix: better cli error when missing mcp dep #6859

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7 changes: 7 additions & 0 deletions marimo/_mcp/server/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@

from marimo._ai._tools.base import ToolContext
from marimo._ai._tools.tools_registry import SUPPORTED_BACKEND_AND_MCP_TOOLS
from marimo._dependencies.dependencies import DependencyManager
from marimo._loggers import marimo_logger

LOGGER = marimo_logger()
Expand All @@ -33,6 +34,12 @@ def setup_mcp_server(app: Starlette) -> None:
Returns:
StreamableHTTPSessionManager: MCP session manager
"""
if not DependencyManager.mcp.has():
from click import ClickException

msg = "MCP dependencies not available. Install with `pip install marimo[mcp]` or `uv add marimo[mcp]`"
raise ClickException(msg)

from mcp.server.fastmcp import FastMCP
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.responses import JSONResponse
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