---
title: "act: keep play"
description: "a play for a brand, written once by the platform as an original or by the tenant: its goal, its condition as a predicate over its population, its class, its tactic, the move it proposes, its measure, its window, its forecast rule, its comparison, when it stops, and its graph of moves as edges (`KeepPlayInput`); the…"
section: reference
address: /reference/act/keep_play
contract: 0476e35e6e275db5
---
# act: keep play
a play for a brand, written once by the platform as an original or by the tenant: its goal, its condition as a predicate over its population, its class, its tactic, the move it proposes, its measure, its window, its forecast rule, its comparison, when it stops, and its graph of moves as edges (`KeepPlayInput`); the…
[figure: The caller sends KeepPlayInput to /v1/act/keep_play. The platform returns a card whose body is Play.]
POST/v1/act/keep_play
Keep a play. The call needs the brand rung under a token with the act grant, and it is served by the platform.
The route takes [KeepPlayInput](/concepts/keepplayinput) and returns a card whose body is [Play](/concepts/play).
## Request body
The request body is [KeepPlayInput](/concepts/keepplayinput).
| field | type | required | note |
|---|---|---|---|
| `play` | [Play](/concepts/play) | yes | its condition and its edges carry their predicates by hash; a predicate given in full under `predicates` is kept first |
| `predicates` | [Predicate](/concepts/predicate) | no | the condition's and the edges' predicates in full, kept by their hashes before the play |
## Response
The route returns a card whose body is [Play](/concepts/play). Every card ends with a foot that states the basis of each number, the scope of the call, and the time when the facts were true.
## Headers
| header | required | meaning |
|---|---|---|
| `Scale-Scope` | yes | the scope the call runs in: tenant/, then /brand/, then /strategy/ |
| `Scale-As-True-On` | no | the date the facts must have been true on; defaults to now |
| `Scale-As-Known-On` | no | the date the facts must have been known on; defaults to now |
| `Scale-Key` | no | for a change, the key made from the input; a repeat under the same key returns the unit held and writes nothing |
A caller needs the brand rung and a token with the act grant. The platform serves this route.
## Example
The example sends the smallest body that KeepPlayInput allows. The build validates it against the schema of KeepPlayInput.
Example
```sh
curl -X POST https://api.scaleintelligence.co/v1/act/keep_play \
-H "Scale-Key: $SCALE_KEY" -H "Scale-Scope: tenant/" \
-H "content-type: application/json" \
-d '{ "play": { "name": "…", "brand": "…", "goal": "…", "condition": { "tree": { "form": "group" }, "population": "…", "tree_hash": "…", "register_hash": "…", "compiler_version": "…", "comparator_versions": {} }, "class": "…", "tactic": "…", "proposes": "…", "measure": "…", "window": "…", "forecast_rule": "…", "comparison": "…", "stop": "…", "armed": false, "kind_of_move": "…", "graph": [], "share": 0, "holdout": 0, "trigger": "a match" } }'
```
```typescript
import { client } from "@scale/sdk";
const answer = await client.act.keep_play({
"play": {
"name": "…",
"brand": "…",
"goal": "…",
"condition": {
"tree": {
"form": "group"
},
"population": "…",
"tree_hash": "…",
"register_hash": "…",
"compiler_version": "…",
"comparator_versions": {}
},
"class": "…",
"tactic": "…",
"proposes": "…",
"measure": "…",
"window": "…",
"forecast_rule": "…",
"comparison": "…",
"stop": "…",
"armed": false,
"kind_of_move": "…",
"graph": [],
"share": 0,
"holdout": 0,
"trigger": "a match"
}
});
// answer.body is a Play. answer.foot holds the basis, the scope and the time.
```
```python
import requests
answer = requests.post("https://api.scaleintelligence.co/v1/act/keep_play",
headers={"Scale-Key": KEY, "Scale-Scope": "tenant/"},
json={
"play": {
"name": "…",
"brand": "…",
"goal": "…",
"condition": {
"tree": {
"form": "group"
},
"population": "…",
"tree_hash": "…",
"register_hash": "…",
"compiler_version": "…",
"comparator_versions": {}
},
"class": "…",
"tactic": "…",
"proposes": "…",
"measure": "…",
"window": "…",
"forecast_rule": "…",
"comparison": "…",
"stop": "…",
"armed": false,
"kind_of_move": "…",
"graph": [],
"share": 0,
"holdout": 0,
"trigger": "a match"
}
}).json()
```
```rust
let answer: Card = client.post("https://api.scaleintelligence.co/v1/act/keep_play")
.header("Scale-Key", key).header("Scale-Scope", "tenant/")
.json(&KeepPlayInput { /* the fields of the page */ }).send().await?.json().await?;
```