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 v2.1.233 Home All releases olderv2.1.232 v2.1.234newer
Claude Code v2.1.233

REPL contexts moved into per-session tool state

Under the hood
Useful2 Signal2
REPL

REPL contexts moved to a registry that releases timers even on error paths.

Feature flag
tengu_slate_harbor Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.233: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.233. It isn't a statement about your account. What a flag value here can and cannot tell you

What

REPL contexts no longer live on the session object. They sit in a registry with explicit release, wired into session teardown and into a finally block on the MCP server tool path so timers get cleared on the error route too.

Details
  • getReplContexts() and setReplContext() are gone from tool-use context objects, including both non-interactive builders; the REPL tool and the fork/replay-log path now read a keyed entry in tool state instead.
  • A teardown step is literally named replContext.
  • The REPL feature stays behind tengu_slate_harbor, which falls back to false, or CLAUDE_CODE_REPL.
Evidence

replContext, getReplContexts: () => ({}),

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 v2.1.233 →