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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.10 17 Jan 2026

Improved Command Path Detection

What

Claude Code now uses native which (Unix) or where.exe (Windows) commands instead of the previous findActualExecutable approach for detecting executable paths.

Details

More efficient and reliable command detection
Uses Bun.which() when running under Bun runtime
Falls back to shell-based which/where.exe on other runtimes
Includes both async (GC()) and sync (d1Q()) variants

Evidence

W94() at line 27476 (new which-based implementation, calls where.exe on Windows, which on Unix)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.10 →