Call a Tool on an MCP Server

See more MCP Client Examples

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.

--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @mcp int
    EXEC @hr = sp_OACreate 'Chilkat.Mcp', @mcp OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  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.
    EXEC sp_OAMethod @mcp, 'Connect', @success OUT, 'https://learn.microsoft.com/api/mcp'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mcp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mcp
        RETURN
      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.
    DECLARE @args int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @args OUT

    EXEC sp_OAMethod @args, 'UpdateString', @success OUT, '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.
    DECLARE @result int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @result OUT

    EXEC sp_OAMethod @mcp, 'CallTool', @success OUT, 'microsoft_docs_search', @args, @result
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mcp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mcp
        EXEC @hr = sp_OADestroy @args
        EXEC @hr = sp_OADestroy @result
        RETURN
      END

    EXEC sp_OASetProperty @result, 'EmitCompact', 0
    EXEC sp_OAMethod @result, 'Emit', @sTmp0 OUT
    PRINT @sTmp0
    --  JSON parsing code for this result can be generated at Chilkat's online tool:
    --  https://tools.chilkat.io/jsonParse

    EXEC @hr = sp_OADestroy @mcp
    EXEC @hr = sp_OADestroy @args
    EXEC @hr = sp_OADestroy @result


END
GO