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docs/python-sdk/fastmcp-client-transports-memory.mdx

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fastmcp.client.transports.memory

Classes

FastMCPTransport <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/transports/memory.py#L14" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

In-memory transport for FastMCP servers.

This transport connects directly to a FastMCP server instance in the same Python process. It works with both FastMCP 2.x servers and FastMCP 1.0 servers from the low-level MCP SDK. This is particularly useful for unit tests or scenarios where client and server run in the same runtime.

Methods:

connect_session <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/transports/memory.py#L33" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

python
connect_session(self, **session_kwargs: Unpack[SessionKwargs]) -> AsyncIterator[ClientSession]