tengu_flag
A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
A plan approval can only be answered once, and a mismatched answer no longer hangs.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.251.
In the changelogs
7Releases whose published page names tengu_flag.
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v2.1.269
Web search tool's model selection gated behind tengu_plum_vx3
Web search tool's model choice now goes through a feature-flag check instead of always using the main model
gate cited by this entry
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v2.1.267
New CCR telemetry gate: upload hold marker
New telemetry gate can add upload-hold details to Claude Code Remote's upload data
gate cited by this entry
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v2.1.267
New env var forwarded for memory-context system reminders
New SYSTEM_REMINDER_MEMORY_CONTEXT environment variable can force-enable background memory fetches
gate cited by this entry
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v2.1.265
MCP connections gain legacy HTTP+SSE fallback on initialize failure
MCP servers using newer HTTP now automatically retry with an older HTTP+SSE connection method if the newer one fails
gate cited by this entry
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v2.1.260
New /diff command toggle wording behind tengu_jazzy_ripple
/diff's description wording can change to reflect a toggle, behind an internal flag.
gate cited by this entry
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v2.1.257
Sync-transport auth handshake option (feature-flagged)
Behind a flag, the sync-transport handshake can use a sync token instead of the existing live subscription token.
gate cited by this entry
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v2.1.251
Plan approvals cannot be answered twice
A plan approval can only be answered once, and a mismatched answer no longer hangs.
gate cited by this entry, found in this entry's text
Gate readings
0No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.
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
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
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.