-By default, the MCP server provides a simple set of tools for Actor discovery and Actor calling. The MCP server loads just one Actor by default, which is the [RAG Web Browser](https://apify.com/apify/rag-web-browser) Actor. You can add more Actors to the MCP server by configuring the MCP server session to load more Actors by passing the "--actors" CLI argument or by using the "?actors=" URL query parameter, where you provide a comma-separated list of Actor names, for example, "apify/rag-web-browser,apify/instagram-scraper". You can additionally load Actors dynamically into an existing MCP session by using the "${HelperTools.ACTOR_ADD}" tool, which loads the Actor by its name as an MCP tool and allows you to call it (**the MCP client must support the [tools list changed notification](https://modelcontextprotocol.io/specification/2025-06-18/server/tools#list-changed-notification); otherwise, the tool call will not work**). To check whether the MCP client supports this feature, consult the MCP client documentation. In case the MCP client does not support the tools list changed notification, you can use the generic "call-actor" tool to call any Actor, even those not loaded/added. Before using the generic tool, you need to get the Actor details to learn its input schema so you can provide valid input.
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