Call a Tool on an MCP Server

See more MCP Client Examples

Demonstrates Mcp.CallTool, which calls the MCP tools/call method for a named tool, passing a JSON arguments object and receiving the tool's result. The example calls the Microsoft Learn microsoft_docs_search tool.

Tip: Code to parse the returned JSON can be generated with Chilkat's online tool at https://tools.chilkat.io/jsonParse.

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Mcp;

public class ChilkatExample {

    public static void main(String[] args) {
        Mcp mcp = new Mcp();

        // Connect to a public MCP (Model Context Protocol) server over its Streamable HTTP endpoint.  The
        // Microsoft Learn MCP server is public and requires no authentication.
        try {
            mcp.connect("https://learn.microsoft.com/api/mcp");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Build the tool's input arguments.  The members required depend on the tool's input schema (see
        // ListTools).  Here the Microsoft Learn "microsoft_docs_search" tool takes a search query.
        JsonObject args_ = new JsonObject();
        args_.updateString("query", "How do I create an Azure storage account?");

        // Call the MCP tools/call method for the named tool.  The tool's result is placed in the result
        // JsonObject.
        JsonObject result = new JsonObject();
        try {
            mcp.callTool("microsoft_docs_search", args_, result);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        result.setEmitCompact(false);
        System.out.println(result.emit());
        // JSON parsing code for this result can be generated at Chilkat's online tool:
        // https://tools.chilkat.io/jsonParse
    }
}