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https://github.com/bytedance/deer-flow.git
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0ff2e9ddcf
* fix(mcp): honor configured stdio working directories * fix(mcp): preserve defaults for empty working directories Treat empty stdio cwd values as omitted, including unresolved environment references. Add real subprocess regressions for discovery and pooled-call defaults, plus direct connection-dictionary coverage.
83 lines
3.2 KiB
Python
83 lines
3.2 KiB
Python
"""MCP client using langchain-mcp-adapters."""
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import logging
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from typing import Any
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from deerflow.config.extensions_config import ExtensionsConfig, McpServerConfig
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from deerflow.mcp.headers import illegal_header_value_reason
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logger = logging.getLogger(__name__)
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def build_server_params(server_name: str, config: McpServerConfig) -> dict[str, Any]:
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"""Build server parameters for MultiServerMCPClient.
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Args:
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server_name: Name of the MCP server.
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config: Configuration for the MCP server.
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Returns:
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Dictionary of server parameters for langchain-mcp-adapters.
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"""
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transport_type = config.type or "stdio"
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params: dict[str, Any] = {"transport": transport_type}
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if transport_type == "stdio":
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if not config.command:
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raise ValueError(f"MCP server '{server_name}' with stdio transport requires 'command' field")
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params["command"] = config.command
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params["args"] = config.args
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if config.cwd:
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params["cwd"] = config.cwd
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# Add environment variables if present
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if config.env:
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params["env"] = config.env
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elif transport_type in ("sse", "http"):
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if not config.url:
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raise ValueError(f"MCP server '{server_name}' with {transport_type} transport requires 'url' field")
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params["url"] = config.url
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# Add headers if present
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if config.headers:
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# A statically configured value the transport would refuse gets the
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# same treatment as a request-scoped one: h11 renders the full
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# value into its exception on a line break or surrounding
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# whitespace, which reaches the model through
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# ToolErrorHandlingMiddleware. These values are API keys often
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# enough to be worth refusing here, where build_servers_config
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# already drops just this server and logs the reason.
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for header_name, header_value in config.headers.items():
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reason = illegal_header_value_reason(header_value)
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if reason is not None:
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raise ValueError(f"MCP server '{server_name}' has a header '{header_name}' that cannot be sent as an HTTP header value: it {reason}")
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params["headers"] = config.headers
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else:
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raise ValueError(f"MCP server '{server_name}' has unsupported transport type: {transport_type}")
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return params
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def build_servers_config(extensions_config: ExtensionsConfig) -> dict[str, dict[str, Any]]:
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"""Build servers configuration for MultiServerMCPClient.
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Args:
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extensions_config: Extensions configuration containing all MCP servers.
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Returns:
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Dictionary mapping server names to their parameters.
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"""
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enabled_servers = extensions_config.get_enabled_mcp_servers()
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if not enabled_servers:
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logger.info("No enabled MCP servers found")
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return {}
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servers_config = {}
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for server_name, server_config in enabled_servers.items():
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try:
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servers_config[server_name] = build_server_params(server_name, server_config)
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logger.info(f"Configured MCP server: {server_name}")
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except Exception as e:
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logger.error(f"Failed to configure MCP server '{server_name}': {e}")
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return servers_config
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