---
id: PLAY-1
family: RT-PLAY
level: core
profiles: [runtime, editor-client]
posture: normative-target
added: "1.0"
changed: "1.0"
source: https://flowdrop.io/spec/rules/rt-play/play-1
specification: FlowDrop Workflow Specification 1.0-draft
licence: CC BY 4.0
---

# PLAY-1 — Playground sessions and messages are addressed and published by UUID

*RT-PLAY (Part II) · level: core · profiles: runtime, editor-client · added in 1.0*

## The rule

> **Normative.** This is the rule.
>
> 1. Every playground route parameter naming a session or a message is a UUID, and every `id` published (a session row's, a message row's, and a message row's `sessionId`) is that UUID, never an internal record identifier.
>
> 2. The single exception is the session list's `ids` filter, which takes a comma-separated list of internal identifiers, dropping values that are not positive integers: it is a narrowing of what the caller can already see, not a client-facing identifier.
>
> 3. So that one door accepts internal identifiers inbound and answers UUIDs outbound, deliberately.

## Related rules

- Names: PLAY-5
- Referenced by: PLAY-2, PLAY-5

---

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.