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installed-skill

A deny rule by default: it refuses a write to an installed skill copy, which re-installing discards, and names what to run instead.

What it catches

A write to an installed skill copy, which re-installing discards.

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({"installed-skill": "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 [installed-skill]: ...

A workspace that sets this rule to advise sees advise [installed-skill]: ... instead.

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

See also

ReferencePages in this section. architecture-unbriefed: an agent's next call after a structure question, or a new directory, before the architecture skillA deny rule by default: it refuses an agent's next call after a structure question, or a new directory, before the architecture skill, and names what to run instead. buzz-unbriefed: the first Buzz a session authors, by file write or `magus buzz -e`, before reading the Buzz skillA deny rule by default: it refuses the first Buzz a session authors, by file write or `magus buzz -e`, before reading the Buzz skill, and names what to run instead. interpreter-script: an ad-hoc script in python, node, perl or ruby, where Buzz is the workspace's scripting languageA deny rule by default: it refuses an ad-hoc script in python, node, perl or ruby, where Buzz is the workspace's scripting language, and names what to run instead.
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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.

Op

A single tool-native command a target composes (long form: operation); the middle of the work hierarchy (Spell to Op to Target). Op 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.

Skill

A packaged set of instructions an agent host loads when a task matches its description: a directory holding a SKILL.md. magus ships its magus-* skills in the binary and writes them with magus agent install. Skill 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

This page uses none of the site's convention markers. The full set is on the conventions page.