spawn-waiter

A deny rule by default: it refuses a spawn whose child exists to wait on, poll or watch other work, and names what to run instead.

What it catches

A spawn whose child exists to wait on, poll or watch other work.

Why

A host tells a parent when each child ends, and a root waits on a job with magus job wait, so an agent spawned to wait spends a context on a notice that already comes. It reads only the title and the opening of the brief: one that opens on wait, poll, monitor, watch or babysit, or says to wait for, on or until an agent, worker or job. It cannot tell a brief opening on a feature named for watching ("Monitor endpoint: add a route") from one whose child only waits.

Default and override

By default this rule takes the decision deny. A workspace sets it by name, in its root magusfile, to deny, advise or off:

magus\guard.builtins({"spawn-waiter": "advise"})

A loosening takes effect once it is committed; a tightening applies at once.

Seeing it

A verdict names its rule in brackets, which is how you got here:

deny [spawn-waiter]: ...

A workspace that sets this rule to advise sees advise [spawn-waiter]: ... instead.

magus describe rule spawn-waiter prints the same entry at a terminal, and magus describe rules lists every rule this workspace enforces.

See also

• All rules - what this workspace enforces, deny first
• The guard - how a verdict is reached and wired
• Setting a built-in rule - how a workspace changes this default