---
title: "read: grounding priors"
description: "a platform, or nothing (`GroundingPriorsInput`) to how often a person supported each kind of suggestion at each breadth, one row per kind, platform and breadth (`GroundingPriors`)"
section: reference
address: /reference/read/grounding_priors
contract: 0476e35e6e275db5
---

# read: grounding priors

a platform, or nothing (`GroundingPriorsInput`) to how often a person supported each kind of suggestion at each breadth, one row per kind, platform and breadth (`GroundingPriors`)

[figure: The caller sends GroundingPriorsInput to /v1/read/grounding_priors. The platform returns a card whose body is GroundingPriors.]

<span class="op-method">POST</span><span class="op-path">/v1/read/grounding_priors</span>

Read the priors of grounding. The call needs the user rung under a token with the read grant, and it is served by the platform.

The route takes [GroundingPriorsInput](/concepts/groundingpriorsinput) and returns a card whose body is [GroundingPriors](/concepts/groundingpriors).



## Request body
The request body is [GroundingPriorsInput](/concepts/groundingpriorsinput).



| field | type | required | note |
|---|---|---|---|
| `platform` | `text` | no |  |



## Response
The route returns a card whose body is [GroundingPriors](/concepts/groundingpriors). 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/<id>, then /brand/<id>, then /strategy/<id> |
| `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 user rung and a token with the read grant. The platform serves this route.

## Example
The example sends the smallest body that GroundingPriorsInput allows. The build validates it against the schema of GroundingPriorsInput.

<details class="wire"><summary>Example</summary>





```sh
curl -X POST https://api.scaleintelligence.co/v1/read/grounding_priors \
  -H "Scale-Key: $SCALE_KEY" -H "Scale-Scope: tenant/<id>" \
  -H "content-type: application/json" \
  -d '{}'
```




```typescript
import { client } from "@scale/sdk";
const answer = await client.read.grounding_priors({});
// answer.body is a GroundingPriors. answer.foot holds the basis, the scope and the time.
```




```python
import requests
answer = requests.post("https://api.scaleintelligence.co/v1/read/grounding_priors",
    headers={"Scale-Key": KEY, "Scale-Scope": "tenant/<id>"},
    json={}).json()
```




```rust
let answer: Card = client.post("https://api.scaleintelligence.co/v1/read/grounding_priors")
    .header("Scale-Key", key).header("Scale-Scope", "tenant/<id>")
    .json(&GroundingPriorsInput { /* the fields of the page */ }).send().await?.json().await?;
```




</details>

## MCP tool
The MCP tool `si.read.grounding_priors` takes the same input and returns the same card. The tool only reads data. An MCP host that renders cards draws this card from `ui://scale-intelligence/cards/GroundingPriors`. The [tool's page](/reference/tools/si-read-grounding_priors) describes it.