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instruction-write

An advisory by default: it explains, and blocks nothing, on a write to a cross-host instruction file, which every session loads whole.

What it catches

A write to a cross-host instruction file, which every session loads whole.

Why

A cross-host instruction file is read in full at the start of every session on every host, so a sentence there costs context forever. A rule the guard already refuses or doctor already reports is restated context: delete it the moment the tool starts saying it.

Default and override

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

magus\guard.builtins({"instruction-write": "off"})

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 [instruction-write]: ...

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

See also

guardrulesinstruction-writeadvise
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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.

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.

Tool

An action a model can call through its host: a name, a description, a typed input and a result. magus serves its tools over MCP, each a read of the workspace model or a run of the CLI it already has. Tool in full.

Session

An agent host's conversation, by the id the host delivers to its hooks. magus never mints one: a record with no session is unattributed, and the OS user it carries says whose account ran it. Session in full.

Advisor

One read-only check from the advice suite: it reads the changeset through magus and writes one titled section of findings. The same advisors run as a pull request comment in CI and inside magus diff --impact locally. Advisor in full.

Conventions

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