---
id: CFG-4
family: GR-CFG
level: core
profiles: [storage-api]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-cfg/cfg-4
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# CFG-4 — Priority 1, a value delivered on a wire

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

The first place a parameter's value can come from is the run itself: a value another node sent down a wire, or a value the launch payload supplied.

## The rule

> **Normative.** This is the rule.
>
> 1. A parameter takes its value from the runtime inputs when the parameter is internal, or is both connectable and exposed, and the runtime inputs contain a key of that name.
>
> 2. A key present with a null value counts as supplied (CFG-7).
>
> 3. A parameter that fails this test falls through to priority 2 (CFG-5).

## Related rules

- Names: CFG-5, CFG-6, CFG-7, EXPO-10
- Referenced by: CFG-5, CFG-6, CFG-7, CFG-8, CFG-16, CFG-17, EXPO-10, DATA-7

---

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.