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.

#include <CkMcpW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkMcpW 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.
    success = mcp.Connect(L"https://learn.microsoft.com/api/mcp");
    if (success == false) {
        wprintf(L"%s\n",mcp.lastErrorText());
        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.
    CkJsonObjectW args;
    args.UpdateString(L"query",L"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.
    CkJsonObjectW result;
    success = mcp.CallTool(L"microsoft_docs_search",args,result);
    if (success == false) {
        wprintf(L"%s\n",mcp.lastErrorText());
        return;
    }

    result.put_EmitCompact(false);
    wprintf(L"%s\n",result.emit());
    //  JSON parsing code for this result can be generated at Chilkat's online tool:
    //  https://tools.chilkat.io/jsonParse
    }