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.

require 'chilkat'

success = false

mcp = Chilkat::CkMcp.new()

#  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 == false)
    print mcp.lastErrorText() + "\n";
    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 = Chilkat::CkJsonObject.new()
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 = Chilkat::CkJsonObject.new()
success = mcp.CallTool("microsoft_docs_search",args,result)
if (success == false)
    print mcp.lastErrorText() + "\n";
    exit
end

result.put_EmitCompact(false)
print result.emit() + "\n";
#  JSON parsing code for this result can be generated at Chilkat's online tool:
#  https://tools.chilkat.io/jsonParse