tengu_tether_decision
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.
New gated 'tether' system can thread API requests together server-side instead of resending full context each turn
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.265.
In the changelogs
4Releases whose published page names tengu_tether_decision.
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v2.1.280
Tether decision telemetry gains dropHeldStateless field
Tether decision telemetry now also records whether held state was dropped
found in this entry's text
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v2.1.275
New telemetry event tengu_tether_unrecognised_400
Claude Code added a new telemetry event, tengu_tether_unrecognised_400, for the thread-continuation system
found in this entry's text
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v2.1.265
New "tether" request-threading protocol for API continuity (gated, off by default)
New gated 'tether' system can thread API requests together server-side instead of resending full context each turn
gate cited by this entry
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v2.1.265
New telemetry: tether decision/outcome/echo-audit events
New telemetry events track the tether feature's threading decisions, outcomes, and echo audits
gate cited by this entry
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
1The earliest release whose published evidence quoted tengu_tether_decision was v2.1.265, 8 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
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.