Terminal Logs — Boundary Documentation

You can add logging to determine what the BAML runtime is doing when it calls LLM endpoints and parses responses.

To enable logging, set the BAML_LOG environment variable:

1 # default is warn
2 BAML_LOG=info

Level	Description
`error`	Fatal errors by BAML
`warn`	Logs any time a function fails (includes LLM calling failures, parsing failures)
`info`	Logs every call to a function (including prompt, raw response, and parsed response)
`debug`	Requests and detailed parsing errors (warning: may be a lot of logs)
`trace`	Everything and more
`off`	No logging

Example log:

Since >0.54.0:

To truncate each log entry to a certain length, set the BOUNDARY_MAX_LOG_CHUNK_CHARS environment variable:

1 BOUNDARY_MAX_LOG_CHUNK_CHARS=3000

This will truncate each part in a log entry to 3000 characters.