MGS3024: a hook names no agent host
A hook script (magus-command, magus-path, magus-observe or
magus-checkpoint, in either its sh or Buzz form) ran without being told which
agent host called it:
[MGS3024] this hook passed no --agent-name, so magus cannot tell which host it
answers: merge what `magus describe harness` prints into the host's hook configuration.
On a guard hook the call is denied. On the observe and checkpoint hooks nothing is recorded and the message goes to stderr.
Why
The glue picks the reply a host can parse from the host's name. Claude Code
takes permissionDecision: "ask" and prompts; Codex marks the same reply a
failed hook and runs the call. So a reply chosen for the wrong host can let a
call through that should have been stopped.
magus does not work the host out from the event's shape or default to one
host. The host says who it is, and the configuration magus describe harness
prints for each host passes its name, the harness spell's own
mgs_getName(), on every hook command: -- --agent-name claude-code after a
Buzz script, --agent-name codex after an sh one. See
Told, never guessed.
What to do
Run magus describe harness <host> and the merge command it prints, or
add --agent-name <host> to the hook command by hand if you wrote the
configuration yourself.