tengu_subagent_type_miss
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.
The Task tool now rejects launches missing subagent_type instead of silently picking a default agent
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.235.
In the changelogs
2Releases whose published page names tengu_subagent_type_miss.
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v2.1.265
Subagent type-matching telemetry now records requested name length; fork override marks parent system prompt
Subagent-type mismatch telemetry now records the length of the requested name; forked teammates flag an inherited system prompt
gate cited by this entry
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v2.1.235
Task tool: omitting subagent_type now fails with the list of available agents
The Task tool now rejects launches missing
subagent_typeinstead of silently picking a default agentgate 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.