---
id: EDGE-5
family: GR-EDGE
level: core
profiles: [storage-api]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/gr-edge/edge-5
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# EDGE-5 — A declared edge type wins over the handle, if it is recognised

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

An edge may name its own kind instead of leaving it to the handles. Because a named kind overrides what the handles say, a name nobody recognises is refused rather than carried through.

## The rule

> **Normative.** This is the rule.
>
> 1. An edge is a tool edge when its declared `data.edgeType` is `tool_availability`, or, where there is no declaration, when its target handle ends with `-input-tool`.
>
> 2. A recognised declaration decides in both directions: a declared `tool_availability` makes an edge with an ordinary handle a tool edge, and any other recognised declaration makes an edge with a `-input-tool` handle not one.
>
> 3. A declaration that is absent, empty, or not a string falls back to the handle.
>
> 4. A declared type that is not recognised is refused at save with a validation error: an implementation must not carry an unrecognised type through as a kind of its own, where it matches nothing and so is neither classified nor excluded, and a mistyped kind silently becomes an ordinary ordering edge.

## Why

Recorded under OPEN-17.

## Related rules

- Names: EDGE-7
- Referenced by: EDGE-7, CMP-4

---

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.