> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agents.labs.bandwidth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# List node types

> MCP reference for list_node_types.

Tool: `list_node_types`. Requires **Viewer or higher** in the applicable workspace and a connected [OAuth session](https://docs.agents.labs.bandwidth.com/mcp/authentication.md).

Returns `spec_version` and available node types with summary, category, and display name. Inspect `get_node_type` for configuration before authoring a node. Keep track of the specification version when generating definitions.

## Arguments

Send an empty arguments object: `{}`.

## Example arguments

Replace sample resource IDs with IDs returned in your selected workspace.

```json theme={null}
{}
```

## Result and errors

The schema below describes MCP `structuredContent`, including the `result` wrapper where present. Your client may also display a text representation. Read success flags and structured errors before continuing; transport success alone does not prove the operation succeeded. Authentication, missing membership, and insufficient role can fail before a tool result is produced. See [troubleshooting](https://docs.agents.labs.bandwidth.com/mcp/troubleshooting.md).

**Effect:** Reads data. **Retry:** Declared idempotent. Discovery annotations describe behavior; they do not grant permission or replace confirmation for consequential actions.

> [accordion] Input schema
>
> ```json theme={null}
> {
>   "additionalProperties": false,
>   "properties": {},
>   "type": "object"
> }
> ```

> [accordion] Result schema
>
> ```json theme={null}
> {
>   "properties": {
>     "node_types": {
>       "items": {
>         "properties": {
>           "category": {
>             "type": "string"
>           },
>           "description": {
>             "type": "string"
>           },
>           "display_name": {
>             "type": "string"
>           },
>           "name": {
>             "type": "string"
>           }
>         },
>         "required": [
>           "name",
>           "display_name",
>           "description",
>           "category"
>         ],
>         "type": "object"
>       },
>       "type": "array"
>     },
>     "spec_version": {
>       "type": "string"
>     }
>   },
>   "required": [
>     "spec_version",
>     "node_types"
>   ],
>   "type": "object"
> }
> ```


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