# shader.write

> Talos next · Since next

[editor or disk] Check a *.shader.wgsl, then save it: errors come back as {code, line, col, message, hint}, nothing written.

Answers {hash, cost, variants, params}.

| | |
|---|---|
| Title | Write a shader |
| Mode |  |
| Token cost | about 148 tokens (listed only when its toolset is enabled) |
| Toolset | `shaders` |

## Arguments

| Argument | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `dryRun` | `boolean` | no |  |  | Check only |
| `material` | `object` | no |  |  | {path, params}: also write a .material.json |
| `path` | `string` | yes |  |  | A `*.shader.wgsl` file, such as `shaders/glow.shader.wgsl`. |
| `source` | `string` | yes |  |  | //! header lines, then WGSL with fn surface() |

## Example

An MCP `tools/call` with the required arguments (placeholders in angle brackets).

```json
{
  "name": "shader.write",
  "arguments": {
    "path": "<path>",
    "source": "<source>"
  }
}
```