#bun
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Claude Code spends up to a fifth of your tokens on a three-word status line
Independent developers found that Claude Code's background agent_summary feature eats roughly 15–20% of tokens to produce a short status line. There is no built-in way to turn it off, so they published a Bun hook that does.
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Claude Code has switched to a Rust-rewritten Bun
Bun developer Jarred Sumner has stated that, starting with version 2.1.181, Claude Code uses the Rust port of Bun. Simon Willison found confirmation of this in his own installation.
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Bun Rewritten from Zig to Rust with the Help of AI Agents
Bun's creator, Jarred Sumner, has described how he rewrote the runtime from Zig to Rust, handing off a significant share of the work to agents built on language models. The trigger was elusive memory-management bugs.