MCP Tool Overhead, Measured: 26 Tools, $0.03 Every Call
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Connecting one MCP server to your agent adds a per-call tax before anything happens: the GitHub server's 26 tools cost $0.0302 on every single Claude Opus 4.8 call, whether or not a tool is used. The mechanism is invisible until you read the meter, the size depends more on which model you run than on how many tools you connect, and most of it is recoverable. We measured the whole chain: five model families, five real MCP servers, synthetic ladders from 0 to 40 tools, and the caching and…
1Key Takeaways
- Connecting one MCP server to your agent adds a per-call tax before anything happens: the GitHub server's 26 tools cost $0.0302 on every single Claude Opus 4.8 call, whether or not a tool is used.
- The mechanism is invisible until you read the meter, the size depends more on which model you run than on how many tools you connect, and most of it is recoverable.
- We measured the whole chain: five model families, five real MCP servers, synthetic ladders from 0 to 40 tools, and the caching and….
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — AI reports that connecting one MCP server to your agent adds a per-call tax before anything happens: the GitHub server's 26 tools cost $0.0302 on every single Claude Opus 4.8 call, whether or not a tool is used.
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