Task-Specific vs. Native MCP Servers: What a Google Ads Benchmark Actually Showed
A task-specific MCP server and a vendor-native one returned byte-identical Google Ads data and scored the same on accuracy. Across 60 benchmarked runs the real difference was determinism: 3.4-4.5x fewer tool calls, 93.3% vs 66.7% answer stability, and 6.3% vs 47.6% run-to-run token variance.