I Asked My AI "Who Are You" — It Cost 42,000 Tokens to Answer

I typed a 19-character question into Claude Code: who are you? Then I opened the network logs of what my machine actually sent over the wire. I recommend you never do this. It ruins something in you. The numbers My question was 19 bytes . The request that carried it was 118,693 bytes . That's a 6,200x amplification before the model reads a single word I wrote. My actual message was 0.016% of the payload. If this were a letter, I'd be mailing a phone book with a Post-it note inside. Here's the pie, byte for byte: What Bytes Share 38 tool JSON schemas 78,935 66.8% System prompt (behavior manual, safety rules, my git status) 22,178 18.8% A list of 60 more tools it could load, plus 25 skill descriptions 16,844 14.3% My memory files, my email address, today's date 1,126 1.0% My question 19 0.016% And the tool schemas aren't even schemas, mostly. Of those 78,935 bytes, only 29,164 are machine-readable JSON schema. The other 44,392 bytes are English prose — instruction manuals for the model, shipped on every single request. One tool alone, Workflow , carries a 19,012-byte description. That's a small essay. It rides along on every message I send, forever, whether I orchestrate a multi-agent workflow or just say "hi." Sixteen of the 38 tools are for driving a browser preview I never opened. There's an iOS Simulator controller in there. I was asking a chatbot its name. The full manifest, since you asked Every tool schema in that request, largest first. "Prose" is the English description; "schema" is the actual machine-readable part. Approximate tokens = bytes ÷ 4. Tool Bytes Prose Schema ~Tokens Did I need it? Workflow (multi-agent orchestration) 21,609 19,012 1,833 ~5,400 No Artifact (publish web pages) 10,679 6,358 4,002 ~2,670 No AskUserQuestion 4,371 1,097 3,149 ~1,090 No iOS Simulator control 3,976 1,307 2,518 ~990 No ScheduleWakeup (self-pacing loops) 3,942 2,685 1,068 ~985 No visualize show_widget 3,038 648 2,259 ~760 No Agent (spawn subagents) 3,037 1,574 1,342 ~760 N