Call a Tool on an MCP Server

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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.

integer li_rc
integer li_Success
oleobject loo_Mcp
oleobject loo_Args
oleobject loo_Result

li_Success = 0

loo_Mcp = create oleobject
li_rc = loo_Mcp.ConnectToNewObject("Chilkat.Mcp")
if li_rc < 0 then
    destroy loo_Mcp
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  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.
li_Success = loo_Mcp.Connect("https://learn.microsoft.com/api/mcp")
if li_Success = 0 then
    Write-Debug loo_Mcp.LastErrorText
    destroy loo_Mcp
    return
end if

//  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.
loo_Args = create oleobject
li_rc = loo_Args.ConnectToNewObject("Chilkat.JsonObject")

loo_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.
loo_Result = create oleobject
li_rc = loo_Result.ConnectToNewObject("Chilkat.JsonObject")

li_Success = loo_Mcp.CallTool("microsoft_docs_search",loo_Args,loo_Result)
if li_Success = 0 then
    Write-Debug loo_Mcp.LastErrorText
    destroy loo_Mcp
    destroy loo_Args
    destroy loo_Result
    return
end if

loo_Result.EmitCompact = 0
Write-Debug loo_Result.Emit()
//  JSON parsing code for this result can be generated at Chilkat's online tool:
//  https://tools.chilkat.io/jsonParse


destroy loo_Mcp
destroy loo_Args
destroy loo_Result