Glossary

Term	Meaning
Runtime	The single object that owns the graph. Frond.createRuntime(). See Runtime and graph.
Graph	The set of live nodes and their dependency edges.
Node	One slot in the graph: an identity, a result, and a lifecycle. A class extending Frond.NodeBase. See Spec and class.
Node spec	The static configuration on a node — tag, key, dependencies, driver. static readonly spec.
Kind	The spec category (resource, service, facade, or node), labeling intent. See Kinds.
Tag	A stable, path-like string naming the kind of node. Frond.tag(value).
Args	The typed input passed when requesting a node. Frond.Args.None for none.
Key	The pure, deterministic identity value from key(args). See Identity and keys.
Graph node id	tag:key — the identity a node resolves to.
Dependency	An edge to another node, declared with Frond.dep. See Dependencies.
Driver	The side-effect implementation behind a node. Frond.Driver.Async / Effect. See Drivers.
Acquire	The driver hook that produces the initial result.
Refresh	A background re-load of a ready node’s result.
Action	A runtime-mediated method on a node. Frond.ActionContract, Frond.Driver.Action. See Actions.
Result	The value a ready node holds. this.result.
Result validity	Whether the result may be shown — Current, Stale, Expired. See Result validity.
Readiness	Whether a node has loaded data. Crossed with ensureReady().
Operation	Background work on a ready node — action, refresh, or args reconciliation. See Lifecycle.
Handle	A reference to a node by id from runtime.client.node(...).
Release	Cleaning a node’s resources while keeping its graph wiring.
Eviction	Removing a node and its dependents from the graph. See Eviction and release.
Liveness	Demand for a node’s driver live work. See Liveness.
Live lease	A recorded demand for live work — mobx or manual.
Snapshot	The passive, inspectable state of a node or the graph.
Signal	A runtime message on a channel. Frond.Signals.
Sink	A consumer of runtime events. See Tags and diagnostics.

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Next: Runtime invariants.