天狗 · Claude Code's internal name

Tengu

Tengu is what Anthropic engineers call Claude Code — the terminal coding agent. Not a model. The product. Every tengu_ flag in your config is Claude Code under the hood.

Claude Code = Tengu tengu_* flags npm · claude CLI
Sōjōbō, King of the Tengu — traditional Japanese woodblock print of a red-faced daitengu with long nose and yamabushi robes
Sōjōbō, King of the Tengu · Katsukawa Shuntei, late Edo period The mountain teacher spirit — Anthropic's codename for Claude Code