PureBasic Requires Chilkat v11.6.0+

Call a Tool on an MCP Server

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.

Background. The members of the arguments object are defined by the tool's input schema, which is reported by ListTools. This example uses the public, no-authentication Microsoft Learn MCP server.

Chilkat PureBasic Downloads

Download Chilkat for PureBasic

PureBasic

IncludeFile "CkJsonObject.pb"
IncludeFile "CkMcp.pb"

Procedure ChilkatExample()

    success.i = 0

    mcp.i = CkMcp::ckCreate()
    If mcp.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  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::ckConnect(mcp,"https://learn.microsoft.com/api/mcp")
    If success = 0
        Debug CkMcp::ckLastErrorText(mcp)
        CkMcp::ckDispose(mcp)
        ProcedureReturn
    EndIf

    ;  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.i = CkJsonObject::ckCreate()
    If args.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckUpdateString(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.i = CkJsonObject::ckCreate()
    If result.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkMcp::ckCallTool(mcp,"microsoft_docs_search",args,result)
    If success = 0
        Debug CkMcp::ckLastErrorText(mcp)
        CkMcp::ckDispose(mcp)
        CkJsonObject::ckDispose(args)
        CkJsonObject::ckDispose(result)
        ProcedureReturn
    EndIf

    CkJsonObject::setCkEmitCompact(result, 0)
    Debug CkJsonObject::ckEmit(result)
    ;  JSON parsing code for this result can be generated at Chilkat's online tool:
    ;  https://tools.chilkat.io/jsonParse


    CkMcp::ckDispose(mcp)
    CkJsonObject::ckDispose(args)
    CkJsonObject::ckDispose(result)


    ProcedureReturn
EndProcedure