> For the complete documentation index, see [llms.txt](https://docs.talordata.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.talordata.com/serp-api/mcp-server/troubleshooting.md).

# Troubleshooting

#### **"missing user token" / "missing bearer token"**

Please provide your authentication token via the URL path <kbd>/{YOUR\_API\_TOKEN}/mcp</kbd>, Authorization: <kbd>Bearer YOUR\_API\_TOKEN</kbd>, or X-Talor-Serp-Token: <kbd>YOUR\_API\_TOKEN</kbd>.

#### "unknown engine"

Please first invoke the `list_engines` tool to view the list of available engines, or consult the `talor://engines` resource to retrieve the engine schema.

#### "Rate limit exceeded"

Please wait or upgrade your Talordata plan.

#### "No Results"

Please try a different query or switch search engines.