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.

<?php

$success = 0;

$mcp = new COM("Chilkat.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 = $mcp->Connect('https://learn.microsoft.com/api/mcp');
if ($success == 0) {
    print $mcp->LastErrorText . "\n";
    exit;
}

//  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 = new COM("Chilkat.JsonObject");
$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.
$result = new COM("Chilkat.JsonObject");
$success = $mcp->CallTool('microsoft_docs_search',$args,$result);
if ($success == 0) {
    print $mcp->LastErrorText . "\n";
    exit;
}

$result->EmitCompact = 0;
print $result->emit() . "\n";
//  JSON parsing code for this result can be generated at Chilkat's online tool:
//  https://tools.chilkat.io/jsonParse

?>