---
id: SG-2
family: RT-SG
level: core
profiles: [runtime]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/rt-sg/sg-2
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# SG-2 — A node sees run state only where it asks for it, and none of it is persisted

*RT-SG (Part II) · level: core · profiles: runtime · added in 1.0*

## The rule

> **Normative.** This is the rule.
>
> 1. Three separate guarantees.
>
> 2. The runtime input handed to a node carries the reserved internal names `__state__`, `__messages__` and `__data__`, plus `__iterator__` and `__current_item__` whenever the state carries an iterator, and `__interrupt_id__` when the node is being resumed; a node sees one of these only where its own parameter schema declares it, and a declared internal parameter always accepts its runtime value.
>
> 3. Separately, the live state is handed only to a node type that declares itself state-aware, and never to one that does not.
>
> 4. And the input recorded against the node's execution has every reserved internal name removed, so no state or interrupt internal is ever persisted, even though the node received it.

## Related rules

- Names: SG-1

---

Rule identifiers are permanent and are never renumbered. This specification carries
no implementation status: each implementation publishes its own standing against
these rules. Licensed CC BY 4.0.