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.

var
success: Boolean;
mcp: HCkMcp;
args: HCkJsonObject;
result: HCkJsonObject;

begin
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) then
  begin
    Memo1.Lines.Add(CkMcp__lastErrorText(mcp));
    Exit;
  end;

//  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) then
  begin
    Memo1.Lines.Add(CkMcp__lastErrorText(mcp));
    Exit;
  end;

CkJsonObject_putEmitCompact(result,False);
Memo1.Lines.Add(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);