Scope check

• This is core LLM communication (not application logic)
• This benefits most users (not just my use case)
• This can't be solved in application code with current RubyLLM
• I read the Contributing Guide

Due diligence

• I searched existing issues
• I checked the documentation

What problem does this solve?

Every tool defined takes up tokens. There are times when an agent may need more tools (in which case I can call with_tool) but then later need less tools (in which case I have to start the conversation from scratch).

Proposed solution

Provide a method like without_tool or remove_tool to remove the tool from the array.

Why this belongs in RubyLLM

I don't see a way to affect the tools array aside from adding to it.