How to Self-Host an AI Code Review Agent on AWS Lambda Using PR-Agent and CDK

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PR-Agent is an open-source AI-powered code review tool originally created by Qodo and later donated to the community, now maintained under its own GitHub organization. It supports commands like /review, /improve, and /ask to automate pull request analysis across GitHub and GitLab. The tool can be deployed on AWS Lambda, which offers a cost-efficient fit since code reviews are event-driven and require no persistent state between invocations. Configuration is handled entirely through environment variables, making it well-suited for serverless environments where mounting config files is not practical. Model calls are routed through LiteLLM, allowing easy switching between providers like OpenAI and AWS Bedrock with a simple config change.

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