tengu_auto_mode_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.
Subagent results can be tagged to show which parts Claude Code wrote versus the model.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.242.
In the changelogs
6Releases whose published page names tengu_auto_mode_decision.
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v2.1.269
Auto-mode permission classifier gets a plugin-origin fast path
Auto mode now auto-allows tool calls that a plugin itself originated, skipping the safety classifier
gate cited by this entry
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v2.1.268
Auto-mode permission telemetry now tags MCP tool calls with connection/ambiguity info
Auto-mode telemetry now tags MCP tool calls with which server they connect to and whether that's ambiguous
gate cited by this entry
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v2.1.267
Auto-mode safety classifier now explicitly blocks when it's unavailable or the transcript is too long, but only for large output schemas
Auto mode now explicitly blocks large tool outputs when its safety classifier can't run
gate cited by this entry
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v2.1.265
Auto mode classifier gains a 'flag instead of block' delivery mode for classifier-only tools
Auto mode classifier can now flag and allow an action instead of blocking it outright
gate cited by this entry
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v2.1.246
Hosts can turn off the auto-mode handback classifier
A host can set classifyHandoff false to skip the classifier deciding whether a subagent hands control back.
gate cited by this entry, found in this entry's text
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v2.1.242
Subagent results can carry a provenance frame that skips the hand-off review
Subagent results can be tagged to show which parts Claude Code wrote versus the model.
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
1The earliest release whose published evidence quoted tengu_auto_mode_decision was v2.1.286, 30 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.