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brief-command

A deny rule by default: it refuses a spawn or continuation brief that teaches a command the guard denies, and names what to run instead.

What it catches

A spawn or continuation brief that teaches a command the guard denies.

Why

A worker runs the commands in its brief as written, so a denied one is refused in every worker the brief reaches, or teaches each of them a way around the refusal. Only what the brief presents as a command is graded, a fenced shell block or an inline code span, with the same rules a shell line gets. A line naming a command to forbid it (never, do not, denied, instead of) is passed over, and a <placeholder> reads as a word rather than a redirect.

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({"brief-command": "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 [brief-command]: ...

A workspace that sets this rule to advise sees advise [brief-command]: ... instead.

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

See also

guardrulesbrief-commanddeny
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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.

Span

OpenTelemetry's name for one unit of work under a trace: a target execution, whose sub-operations are child spans. An output reference points at a span's captured output. Span 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.

Run

One target executing under one magus invocation, such as magus run test web or magus affected ci. A run keeps its captured output behind an output reference. Every magus run is a run whether or not any job asked for it; see Job for how the two relate. Run in full.

Conventions

Placeholders

Angle brackets mark a value you replace with your own; never type the brackets:

magus run <target>
magus completion <shell>    # e.g. bash, zsh, fish

<target>, <path>, <shell>, <name> and the like are stand-ins, not literal text.