IONOS fails to parse some of our tool outputs; make sure to only output strings or stringify outputs

[marcelklehr]

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Steps to reproduce

1. Ask context agent in which timezone a non-existent user is

Expected behaviour

Tool call should succeed

Actual behaviour

tool_message: [{"name": "find_person_in_contacts", "content": [], "tool_call_id": "chatcmpl-tool-bd6edf2b08114811afcecfc7fb0e8d98"}]

Which fails to validate on IONOS:

OpenAI/LocalAI request failed: API request error: 1 validation error for ToolMessage
content
  Input should be a valid string [type=string_type, input_value=[], input_type=list]
    For further information visit https://errors.pydantic.dev/2.12/v/string_type 1 validation error for ToolMessage
content
  Input should be a valid string [type=string_type, input_value=[], input_type=list]
    For further information visit https://errors.pydantic.dev/2.12/v/string_type

Server configuration

c.nc.c