tengu_velvet_heron
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.278, including the newest one read.
A new dialog warns some users that auto mode is still billing them for classifier requests
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.278.
In the changelogs
6Releases whose published page names tengu_velvet_heron.
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v2.1.278
New 'auto mode classifier billing notice' dialog, built but tier-gated
A new dialog warns some users that auto mode is still billing them for classifier requests
gate cited by this entry
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v2.1.278
Declining the billing notice cancels the in-flight tool call
Pressing Escape on the new billing notice cancels the tool call it interrupted
gate cited by this entry
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v2.1.278
Billing notice surfaces as a stderr/stream-json warning in headless (print) mode
The classifier billing notice prints to stderr or a stream-json warning when there's no dialog to show
gate cited by this entry
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v2.1.278
Auto-mode permission decision flow reworked around the new billing notice
Auto mode's core permission check was rebuilt to run the new billing-notice logic before falling back to the local classifier
gate cited by this entry
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v2.1.278
Non-interactive/stream-json sessions get a stderr/warning-event billing notice instead of a dialog
Non-interactive sessions now get the billing notice as stderr text or a stream-json warning event instead of a popup
gate cited by this entry
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v2.1.278
Gateway/proxy detection feeding the billing notice message
Claude Code now detects LLM gateways and swaps the billing notice for a gateway-specific message with a docs link
gate cited by this entry
Gate readings
1| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.278 read on another version | Not enough to say | no value returned | no value returned | on |
Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
1Build by build
38One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.