Spent two hours installing a tool to make my coding agent smarter. Then it refused to use it.

Spent two hours installing a tool to make my coding agent smarter. Then it refused to use it. The tool let the agent read code like an IDE: jump to any symbol, find every caller, no grep. Got it installed, indexed the whole repo, ready to go. Then I watched the agent ignore it. Asked it to find where a function was used: it ran grep. Pointed it at the tool directly, it used it once, next task went straight back to grep. The tool was fine. The agent had a habit and my one-line reminder didn't beat it. So I ripped it out. Native search plus the agent's own file reader - worse on paper, but it actually uses them, beat the better tool it wouldn't touch. Giving an agent a capability and getting it to use that capability are two different problems. The second one is harder, and it's the one that decides whether any of this works. Anyone got a coding agent that actually changed its default tool once you handed it a better one? Genuinely asking.