The MCP Tax Hit 42,000 Tokens on a Single Server. Here's What I Did About It.

Short summary

MCP server schemas consumed 80% of context window before optimization, costing $2,000+ extra monthly. Four solutions—lazy-loading schemas only when referenced, trimming descriptions to 80 chars, allowlisting tools, and using bash for simple operations—reduced overhead from 70-80% to 37%. Lazy-loading alone saved 38% of tokens across mixed workloads.

• •MCP schema overhead reached 80% of context window, adding $2K/month in unnecessary costs
• •Lazy-loading schemas when referenced saved 38%, description trimming reduced size 67%, allowlisting cut tools from 70 to 8
• •Combined optimizations reduced overhead from 70-80% to 37% while maintaining full agent capability

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