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portia.mcp_session

Configuration and client code for interactions with Model Context Protocol (MCP) servers.

This module provides a context manager for creating MCP ClientSessions, which are used to interact with MCP servers. It supports SSE, stdio, and StreamableHTTP transports.

NB. The MCP Python SDK is asynchronous, so care must be taken when using MCP functionality from this module in an async context.

Classes: SseMcpClientConfig: Configuration for an MCP client that connects via SSE. StdioMcpClientConfig: Configuration for an MCP client that connects via stdio. StreamableHttpMcpClientConfig: Configuration for an MCP client that connects via StreamableHTTP. McpClientConfig: The configuration to connect to an MCP server.

SseMcpClientConfig Objects​

class SseMcpClientConfig(BaseModel)

Configuration for an MCP client that connects via SSE.

StdioMcpClientConfig Objects​

class StdioMcpClientConfig(BaseModel)

Configuration for an MCP client that connects via stdio.

from_raw​

@classmethod
def from_raw(cls, config: str | dict[str, Any]) -> StdioMcpClientConfig

Create a StdioMcpClientConfig from a string.

This method is used to create a StdioMcpClientConfig from a string. It supports mcpServers and servers keys methods commonly used in MCP client configs.

Arguments:

  • config - The string or dict to parse.

Returns:

A StdioMcpClientConfig.

Raises:

  • ValueError - If the string is not valid JSON or does not contain a valid MCP config.

StreamableHttpMcpClientConfig Objects​

class StreamableHttpMcpClientConfig(BaseModel)

Configuration for an MCP client that connects via StreamableHTTP.

get_mcp_session​

@asynccontextmanager
async def get_mcp_session(
        mcp_client_config: McpClientConfig) -> AsyncIterator[ClientSession]

Context manager for an MCP ClientSession.

Arguments:

  • mcp_client_config - The configuration to connect to an MCP server

Returns:

An MCP ClientSession