How would you define tool coupling, and why should agents avoid tight coupling to a single tool?

• A. Over-reliance on a single tool.
• B. Relying on a single tool makes the system brittle and harder to recover.
• C. Tool coupling refers to over-reliance on one tool; avoid by using multiple tools for robustness and fallback options.
• D. Tool coupling means combining many tools into a single monolithic interface.

Answer: (C)