Why is at least one property required in tool definitions?

[mattparlane]

Hi there...

I recently moved to Langchain.rb from my own manual solution, and I noticed that tool definitions require at least one property. Can I ask why?

My former manual solution had several tool definitions that required no parameters, ie resend the latest report, mark all outstanding tasks as completed, that sort of thing.

I manually commented out the if parameters[:properties].empty? condition in Langchain::ToolDefinition#add_function and everything worked fine, including my zero-property tools, I tested with OpenAI and Gemini.

If the condition is necessary, can you suggest some sort of no-op property that I could add?

Thanks!