Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Auto ModeArea: what it touches
Internal ChangesKind: in v2.1.278,
What probably matters to youSection of the release
What
The logic that decides whether auto mode uses the server-side classifier (versus falling back to local-only classification) now excludes a specific case of first-party providers from that fallback path, and explicitly checks the CLAUDE_CODE_AUTO_MODE_SERVER environment variable as an override when deciding whether the feature is enabled at all.
Why
This narrows exactly which sessions are eligible for server-side classifier fallback, and makes sure an explicit CLAUDE_CODE_AUTO_MODE_SERVER setting is respected rather than being overridden by other logic.
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 v2.1.278: 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.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Added sinceA small documentation edit on Environment variables touched a line naming CLAUDE_CODE_AUTO_MODE_SERVER after this was published.| `CLAUDE_CODE_AUTO_MODE_SERVER` | Controls whether Claude Code asks the server to [review auto mode actions](/docs/en/permission-modes#server-side-classifier-review). Set to `0` to use Claude Code's own classifier requests instead. On a d…env-varssee the edit
Confirmed sinceAnthropic's documentation has since written up CLAUDE_CODE_AUTO_MODE_SERVER, on Claude Code changelog.* Changed `CLAUDE_CODE_AUTO_MODE_SERVER` to also apply on a direct Anthropic API connection: `0` opts out of the server-side auto mode classifier (the local classifier then counts toward usage), `1` opts inchangelogsee the edit
How sure we are
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up CLAUDE_CODE_AUTO_MODE_SERVER, on Claude Code changelog.
Anthropic's release notes agreeChanged auto mode for Claude API and Enterprise users, and on Bedrock, Vertex, Foundry and gateways, to default to the server-side…
The name it cites is new in this buildNew in this build: tengu_quiet_lantern
