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id: 9c980dd0-e76b-4ff9-876f-40eec632d434 title: Unknown top-level subcommand exits 0 state: closed labels:

• kind:build assignees: [] milestone: null created: 2026-10-27T18:40:27.937158000Z updated: 2026-10-27T19:53:10.547894027Z

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Problem

An unknown top-level subcommand prints an error and help, then exits 0. Scripts that typo build/serve continue as if the command succeeded.

Verified:

$ hu13 nope
hu13: unknown subcommand 'nope'
...
$ echo $?
0

src/main.rs:493-497. Unknown options and unknown inbox subcommands correctly return 2, so this is inconsistent.

Fix

Return 2 from the unknown-subcommand arm; add a CLI exit-code test.