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spawn-above-model-tier

Off by default: once a workspace turns it on, it reports a subagent spawned on a model whose tier ranks above the tier its job was forked at.

What it catches

A subagent spawned on a model whose tier ranks above the tier its job was forked at.

Why

A job row records the model tier it was forked at and why. A spawn of a model the declaration ranks above that tier spends more than the row chose, and the row no longer says why. It compares ranks in the workspace's declaration, never model names or prices, and says nothing for a model no tier maps. It never refuses: work can outgrow its row, and the remedy is re-forking the row at the tier it needs so the choice is recorded, which only the root can judge.

Default and override

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

magus\guard.builtins({"spawn-above-model-tier": "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:

advise [spawn-above-model-tier]: ...

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

See also

ReferencePages in this section. root-context-budget: a session's main thread whose context has grown past its level's sizeOff by default: once a workspace turns it on, it reports a session's main thread whose context has grown past its level's size. root-heavy-command: a main thread running delegable commands one after another without spawningOff by default: once a workspace turns it on, it reports a main thread running delegable commands one after another without spawning. spawn-names-model: a main thread spawning a subagent without naming the model it runs onOff by default: once a workspace turns it on, it reports a main thread spawning a subagent without naming the model it runs on.
guardrulesspawn-above-model-tieroff
Last updated (29d8b3de)
Glossary

Workspace

The magus root directory that owns a set of projects and shared config; the unit magus operates over. Workspace in full.

Magusfile

The magusfile.buzz that declares a project's targets (as export funs) and binds its spells. Magusfile in full.

Buzz

The language magusfiles are written in (the .buzz engine). Buzz in full.

CI

An ordinary target you compose yourself with ctx.needs; magus does not hardcode its stages. It is the anchor magus affected ci keys off, and ci strips the rw charm. CI in full.

Agent

A model working through an agent host such as Claude Code, Codex, Cursor or OpenCode. magus treats an agent as one more caller of its CLI, MCP tools and console, held to the same checks as a person. Agent in full.

Job

The unit of delegated work, and one row of the job store: what an orchestrating agent handed out, with its goal, the checkpoint it was cut against, the paths it may write or must not touch, and the one check it runs. A job's holder is either a session, for work an orchestrator handed out, or the daemon, for its own maintenance. The store records; the agent guard is what reads those facts back when grading a write. Job in full.

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