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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 v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→
Claude Code v2.1.221

/autocompact ungated, plus an --autocompact CLI option

Use it now
Useful5 Signal0
Compaction Notable

You can now set when auto-compaction kicks in with a new --autocompact flag, and /autocompact works for everyone.

Feature flag
tengu_amber_redwood2 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 v2.1.221: not a boolean we can read

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.

tengu_amber_redwood3 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 v2.1.221: not a boolean we can read

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 v2.1.221. It isn't a statement about your account. What a flag value here can and cannot tell you

--autocompact/autocompact
What

The autocompact slash command no longer checks remote config, and there is now a real --autocompact flag whose value is applied to the session instead of being discarded.

Details
  • isEnabled for the slash command dropped its remote-config check, which previously required tengu_amber_redwood2 or tengu_amber_redwood3; it is now enabled outside the thin-client case.
  • New CLI option --autocompact <auto|tokens> sets how full the context gets before auto-summarizing.
  • The parsed value now reaches the session's auto-compact window; the previous code hardcoded undefined and always fell back to the stored setting.
Usage
claude --autocompact auto
claude --autocompact 120000
Evidence

Set how full the context gets before auto-summarizing

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 v2.1.221 →