Error in Strands Agents on Lambda

[foxxqin]

I was using an clean EC2 instance running Amazon Linux 2023 and following the instruction to deploy a Strands Agent on Lambda function: https://github.com/strands-agents/docs/blob/main/docs/examples/cdk/deploy_to_lambda/README.md

I was able to successfully deploy the stack following the instruction but I tried to invoke the Lambda using the payload:

{
  "prompt": "What is the weather in New York?"
}

I got the following error:

{
  "errorMessage": "Unable to import module 'agent_handler': No module named 'pydantic_core._pydantic_core'",
  "errorType": "Runtime.ImportModuleError",
  "requestId": "",
  "stackTrace": []
}

It seems the layer "DependenciesLayerxxxxx" got incompatible versions.

[philcallister]

@foxxqin I ran into the same thing, and the pydantic dependency that got installed is incorrect. You need the right architecture and python runtime:

https://docs.pydantic.dev/latest/integrations/aws_lambda/#installing-pydantic-for-aws-lambda-functions

What fixed it for me was using the --python-version 3.12, as the 3.12 runtime is specified in the CDK definition

[philcallister]

@yonib05 What worked for me on the pip install for the Lambda dependencies was:

pip install -r requirements.txt \
    --platform manylinux2014_aarch64 \
    --target ./packaging/_dependencies \
    --only-binary=:all: \
    --python-version 3.12

[zastrowm]

Thanks for letting us know - fixing as part of #85