At what tool count does your agent start getting dumber?

Reddit r/AI_Agents News

Summary

The author discusses how AI agents' reasoning degrades with too many tools, noting a cap of 20 tools by Genie Code, and invites community discussion on solutions.

Been noticing that past a certain number of tools, my agents stop picking the right one and start picking the plausible one. Somewhere around 15-20 the reasoning gets mushy and I start seeing weird choices — calling a search tool when it already has the answer in context, that kind of thing. Interesting to me that Genie Code caps MCP at 20 tools across all connected servers. First reaction was "that's annoying." Second reaction was that someone probably measured this and picked a number. Curious where other people's ceiling is, and whether you solve it by pruning or by routing to sub-agents with narrow toolsets.
Original Article

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