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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 v2.1.242

The bundle is split into chunks loaded on demand

Under the hood
Useful2 Signal1
Bundle

The program is split into pieces loaded as needed, changing startup shape but nothing you interact with.

What

Code that previously all lived in one file is now split across separate chunk files pulled in as they are needed, which changes startup and memory shape but nothing you interact with.

Details
  • Over a thousand call sites now load a chunk by path; the previous build had none and resolved everything inline.
  • The large design-sync skill prompts have moved out of the main file into a chunk and are still shipped in full.
  • Deep-link handling, config enabling, and the two directory-sync engines are now opened this way, which means those paths can fail at load time. The sync engines record _engine_open_failed and _engine_open_timeout for that case.
Evidence

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 →