Open-Source Tools Enable Lightweight and Streamable MCP Servers on AWS Lambda

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Developers have released two open-source Python projects — modmex-lambda and serverless-python-mcp — designed to run Model Context Protocol (MCP) servers on AWS Lambda without requiring containers, persistent processes, or full web frameworks. The tools support two deployment models: a lightweight buffered approach for short-lived operations via API Gateway and Lambda, and a real streaming HTTP model for long-running tasks that need to report progress incrementally. Both models share a unified Python programming interface, meaning developers do not need to adopt separate application architectures for MCP versus standard REST endpoints. The framework also supports dependency injection and middleware, allowing authorization, logging, and other cross-cutting concerns to be applied consistently across both REST and MCP transports. The projects are available via pip and integrate with the Serverless Framework for deployment.

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