---
id: R1.a
family: GR-VAL
level: core
profiles: [storage-api]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-val/r1-a
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# R1.a — A node's executor must exist

*GR-VAL (Part I) · level: core · profiles: storage-api · added in 1.0*

## The rule

> **Normative.** This is the rule.
>
> 1. A node whose node type resolves to an executor the implementation does not provide is refused with the error code `R1_PLUGIN_MISSING`.
>
> 2. The verdict is reached from the executor's declaration alone; the executor is never constructed in order to decide it.

## Related rules

- Names: R9
- Referenced by: R1.b, R1.c, R9

---

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.