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Eli FosterandClaude Opus 5
dbcdd39a1a
A disposable HOME gives hermit, rustup, npm, and pub a cold cache, so every Claude session re-downloaded its whole toolchain: 13.4s and a 278MB hermit/node fetch for a session that does nothing. The caches now point at a Buzz-owned directory outside the profile, which drops a warm session to 0.6s. The directory is Buzz's own rather than the operator's cache: agents write to it, and a poisoned toolchain must not reach the operator's builds. CARGO_HOME stays unset because it holds credentials.toml and cargo has no cache-only knob, so a shared registry would also share registry tokens. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Signed-off-by: Eli Foster <efoster@squareup.com>