Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.278 ·

Third-party server classifier gating tightened

Auto mode's server-classifier eligibility check adds a new exclusion and respects CLAUDE_CODE_AUTO_MODE_SERVER as an override

TierUnder the hoodhow much it should matter to you
Useful2my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaAuto Modewhat it touches
KindInternal Changesin v2.1.278,
Under the hood Notable

Auto mode's server-classifier eligibility check adds a new exclusion and respects CLAUDE_CODE_AUTO_MODE_SERVER as an override

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.

Read from
Names in the bundleCLAUDE_CODE_AUTO_MODE_SERVER
Feature flag
tengu_quiet_lantern 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 v2.1.278: 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.

Read once, for one account on one subscription tier, against v2.1.278. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Two sources agreeTwo things we can check say the same as this entry.
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

See this entry in the whole of v2.1.278 →