Source Intelligence

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 v2.1.229 Home All releases olderv2.1.228 v2.1.231newer
Claude Code v2.1.229

Global mutable state replaced with per-host containers

Under the hood
Useful2 Signal3
Session State

Shared process-wide state moved into per-session containers, so parallel sessions stop stepping on each other.

What

Session cost and usage counters, telemetry providers, auth state, prompt-cache-break state, skill health and dump-prompt state moved out of one shared mutable object into classes fetched per host through a WeakMap-backed container with an explicit reset. Several ad-hoc caches, including tool-search descriptions, fetched web URLs and agent definitions, are now class instances cleared through that container.

Evidence

ToolSearchTool: cache invalidated - deferred tools changed

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 v2.1.229 →