mcp-lambda-handler
A Python library for creating serverless HTTP handlers for the Model Context Protocol (MCP) using AWS Lambda. This library provides a minimal, extensible framework for building MCP HTTP endpoints with
Score
78/100
9,777 stars
1,457 forks
A low score is not a verdict on quality. Young and niche tools start low by design. How we calculate scores
The Open Source Drop Lens
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
Updated Jul 2026
This handler flips the script. Instead of calling Lambda from MCP, it lets you run an MCP server as a Lambda function. Your AI tools become serverless endpoints. Setup requires packaging your MCP server as a Lambda deployment.
Lambda's free tier is generous, but cold starts add latency to tool calls. This is a library, not a standalone server, so you need to write the glue code yourself.
Interesting pattern for teams that want centralized, shared MCP tools without running persistent servers. The catch: cold starts make interactive tool use sluggish, and debugging Lambda-hosted MCP servers is harder than local ones.
Cost Breakdown
fully freeFree Tier
The MCP server itself is completely free and open source.
Self-Hosted
Runs locally or on your own infrastructure.
Paid
No paid tier. The underlying service may have its own pricing.
Free and open source · underlying service may bill separately
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