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.

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Claude Code v2.1.229

Per-session tool state stops caches leaking between sessions

Under the hood
Useful3 Signal3
Session State

Caches now live per session, so parallel sessions in one process stop contaminating each other.

What

Caches that were previously process-wide now live in a per-session store: the WebFetch URL and domain-check caches, the send-file duplicate set, Bash working-directory tracking, the alias-probe fired set, plus per-host containers holding plugin sync state, the keybinding writer, the diagnostics manager and the binary-check cache. In a process running more than one session at once (SDK, runner, cowork) these no longer bleed across sessions.

Details
  • The store is created with the session context and carried through context construction, forking and agent spawn.
  • Disposing a session installs a fresh store rather than clearing shared maps.
Evidence

toolState: this.toolState, toolState

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 →