Tool count degrades selection accuracy: 98% at 10 tools → 88% at 100
The HumanMCP study measured a decline in function selection accuracy from 98% with 10 tools to 88% with 100 tools.
Supporting evidence
Voice Agent Function Calling: Real-Time Data Lookup Guide
Original excerpt
The HumanMCP study measured a drop from 98% at 10 tools to 88% at 100.
Context
When the toolset grows, selection accuracy falls. Add functions one at a time and re-check selection accuracy after each. One lookup, three failure lines, and a filler function make a complete first release.
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