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 <C_CkMcp.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMcp mcp;
    HCkJsonObject args;
    HCkJsonObject result;

    success = FALSE;

    mcp = CkMcp_Create();

    //  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 = CkMcp_Connect(mcp,"https://learn.microsoft.com/api/mcp");
    if (success == FALSE) {
        printf("%s\n",CkMcp_lastErrorText(mcp));
        CkMcp_Dispose(mcp);
        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.
    args = CkJsonObject_Create();
    CkJsonObject_UpdateString(args,"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.
    result = CkJsonObject_Create();
    success = CkMcp_CallTool(mcp,"microsoft_docs_search",args,result);
    if (success == FALSE) {
        printf("%s\n",CkMcp_lastErrorText(mcp));
        CkMcp_Dispose(mcp);
        CkJsonObject_Dispose(args);
        CkJsonObject_Dispose(result);
        return;
    }

    CkJsonObject_putEmitCompact(result,FALSE);
    printf("%s\n",CkJsonObject_emit(result));
    //  JSON parsing code for this result can be generated at Chilkat's online tool:
    //  https://tools.chilkat.io/jsonParse


    CkMcp_Dispose(mcp);
    CkJsonObject_Dispose(args);
    CkJsonObject_Dispose(result);

    }