# road.edit

> Talos next · Since next

Set or remove .road.json fields by dotted path (null removes), e.g.

{"markings.start": {"atS": 0}} for the start/finish chequer. Checked by the road parser: a bad path or value writes nothing. One change for revert. No set: shows the file.

| | |
|---|---|
| Title | Edit a road file |
| Mode | `disk` |
| Token cost | about 154 tokens (listed only when its toolset is enabled) |
| Toolset | `measure` |

## Arguments

| Argument | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `agent` | `string` | no |  |  | The name of the agent making the call, when several agents share one connection: each named agent is its own actor and plays its own game. Leave it out when there is one agent. |
| `road` | `string` | yes |  |  | The road entity, or a .road.json path |
| `scene` | `string` | no |  |  | The scene file to act on. The open scene when absent. |
| `set` | `object` | no |  |  | Dotted path to value; null removes |

## Example

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

```json
{
  "name": "road.edit",
  "arguments": {
    "road": "<road>"
  }
}
```