Making a Lambda Layer

Create a new virtual environment with uv

uv init .
uv venv --python 3.14
uv pip install --python 3.14 slack-sdk

Install the package in the virtual environment

pip install slack_sdk

Make a directory called python and move the lib directory in there

mkdir python
mv .venv/lib python

Zip up python directory

Go to Finder → Compress

OR

zip -r python.zip python

Create the lambda layer

Select compatible runtimes

Make SURE the compatible runtimes match the folder name in lib ‼️

Create a new layer in the console

Add a lambda layer

Select lambda layer