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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.

← All of v2.1.242 Home All releases ←olderv2.1.241 v2.1.243newer→
Claude Code v2.1.242

The binary is now genuinely code-split

Under the hood
Useful2 Signal1
Bundle

Onboarding, worktrees, tmux, Bedrock, Vertex and more now load on demand instead of at startup.

What

Deferred module loads across the CLI, onboarding, worktree and tmux launch, Chrome MCP wiring, machine-id lookup, the SDK, Bedrock, Vertex and Foundry clients, sandbox install, the daemon hub and AWS SSO now load separate chunk files on demand instead of running an inline initialiser. Nothing behaves differently; first-use cost for those paths moves from module init to loading a chunk.

Details
  • Hundreds of module-init wrappers were removed and their contents inlined or relocated.
  • The worktree launch path now pins storage and initialises the debug log and feature-flag credentials before handing off.
Evidence

HOOKS_WORKER_URL, await import("/$bunfs/root/chunk-XXXXXXXX.js")

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.242 →