MCP Server Schema Bloat Can Consume 60% of Claude Code Context Before Work Begins

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A developer discovered that running 10 MCP servers in Claude Code was injecting over 111,000 tokens of schema data at the start of every conversation, consuming roughly 60% of the available context window before any actual work began. Measuring each server individually revealed that three were used zero times per week and two more only once or twice, yet all loaded their full schemas every session. The developer estimated this silent overhead cost approximately $2,500 per year based on per-conversation token pricing. Reducing active MCP servers from 10 to 3 cut context overhead by 97%, extending usable conversation length from around 15 messages to 45. An open-source tool called mcptoon was also highlighted as a way to audit server token costs and compress remaining schemas to reduce waste further.

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