Target
A named operation (build, test, ...) you invoke with magus run <target>; it may compose a spell's tool-native operations and depend on other targets. Target in full.
Spell
A language/runtime adapter (e.g. go, md) that maps generic targets onto a toolchain's real commands. Spell in full.
Affected
The set of projects touched by a change; magus affected <target> runs a target only over them. Affected 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.
Output reference
A short, shareable id such as out1a2b3c for one target execution's captured output; magus query output prints those exact bytes. In OpenTelemetry terms it names a span. Output reference in full.
Concurrency
How many targets run at once. It is bounded by the pool's capacity and set with --concurrency, MAGUS_CONCURRENCY, or the concurrency config key. Concurrency in full.
Knowledge graph
The queryable graph of a workspace's spells, targets, docs, and code relationships; query it with magus query/explain/path. Knowledge graph in full.
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.
Invocation
One magus process's recorded facts (the targets it finished, their outcomes, the lease it acted as, and the session it ran in when a host delivered one), kept in a repo-scoped store every worktree shares. magus session lists them; the store prunes itself by last-fact age. Invocation 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.
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.
Lease
The grant a holder takes on a job: the write and read paths that job declared, enforced in the checkout that took it with magus job exec. A job is the piece of work; a lease is permission over it. Lease in full.