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What Claude Code sends before you type: 58 versions measured, from July 2025 to this week

This story is from 2026-10-24. It is preserved in the archive; the latest stories are on the live feed.

Every Claude Code request starts with the same fixed block: the system prompt and the definitions of every built-in tool. You pay for it before your own words are counted, and it is a big reason why short sessions and subagents burn through limits faster than you'd expect. I wanted to know how that…

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  1. 2026-10-24 12:18 · DEV Community — AI
    What Claude Code sends before you type: 58 versions measured, from July 2025 to this week

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