Python scripts in prompts does not work with anthropic as provider

[harsh-writesonic]

Stacktrace:

/usr/local/lib/node_modules/promptfoo/dist/src/prompts.js:225
                            args: [JSON.stringify(context)],
                                        ^

TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'Anthropic'
    |     property 'completions' -> object with constructor 'Completions'
    --- property '_client' closes the circle
    at JSON.stringify (<anonymous>)

promptfooconfig.yaml

prompts:
  - file://prompt.py

providers:
  - openai:gpt-4o
  - anthropic:messages:claude-3-opus-20240229

Nodejs version - v20.12.2
Promptfoo version - 0.58.1
Please let me know if it is reproducible for you.

[Ian Webster]

Thanks for flagging! Fix in #784

As a temporary workaround, you can switch to using a specific function in the python file, e.g. prompt.py:my_prompt. That should work alright in the current version.

[harsh-writesonic]

Thanks for quick fix.

[Ian Webster]

Released in 0.59.0!