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.

load ./chilkat.dll

set success 0

set mcp [new_CkMcp]

#  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.
set success [CkMcp_Connect $mcp "https://learn.microsoft.com/api/mcp"]
if {$success == 0} then {
    puts [CkMcp_lastErrorText $mcp]
    delete_CkMcp $mcp
    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.
set args [new_CkJsonObject]

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.
set result [new_CkJsonObject]

set success [CkMcp_CallTool $mcp "microsoft_docs_search" $args $result]
if {$success == 0} then {
    puts [CkMcp_lastErrorText $mcp]
    delete_CkMcp $mcp
    delete_CkJsonObject $args
    delete_CkJsonObject $result
    exit
}

CkJsonObject_put_EmitCompact $result 0
puts [CkJsonObject_emit $result]
#  JSON parsing code for this result can be generated at Chilkat's online tool:
#  https://tools.chilkat.io/jsonParse

delete_CkMcp $mcp
delete_CkJsonObject $args
delete_CkJsonObject $result