---
title: "validate_widget"
description: "Dry-run validation of a dashboard widget."
sidebarTitle: "validate_widget"
lastUpdated: "2026-09-23"
---

> **For AI agents:** the complete documentation index is at [llms.txt](/llms.txt). Append `.md` to any page URL for its markdown version.

{/* GENERATED FILE: do not edit by hand. Regenerate with: node scripts/generate.mjs */}

Dry-run validation of a dashboard widget.

<Note>
  **Read-only.** Safe to call: this tool does not modify data.
</Note>

## Parameters

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `widget_json` | string | Yes | JSON string of the widget data section (same format as the template output, without _metadata) |

## Example arguments

Illustrative arguments an agent supplies when calling this tool:

```json
{
  "widget_json": "string"
}
```

## Description

```text
Checks type, structure, query fields, placeholder detection, and per-type constraints. Returns errors and warnings without modifying any dashboard.

Use before add_dashboard_widget to catch errors early.
```

## Related

- [`add_dashboard_widget`](/mcp/tools/dashboard-widget/add_dashboard_widget)

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