Bug Report: Invalid typecast in TMS.MCP.HTTPServer.General.pas causes EInvalidPointer crash

DEV TMS AI Studio
1

Hi,

I’d like to report a bug in TMS MCP (AI Studio)

File: TMS.MCP.HTTPServer.General.pas

In TTMSMCPGeneralHTTPServer.DoCommandGet, there is an invalid typecast that causes memory corruption and EInvalidPointer crashes when clients connect to the MCP HTTP server.

Bug location (line 177-178):

if not Assigned(AContext.Data) then
AContext.Data := TTMSMCPGeneralHTTPServerConnection(AContext); // BUG: typecast instead of Create
Expected (compare with DoCommandOther at line 196-197):

if not Assigned(AContext.Data) then
AContext.Data := TTMSMCPGeneralHTTPServerConnection.Create(AContext); // Correct

This causes EInvalidPointer in TIdContext.Destroy when Indy frees the connection context.

Reproduction:

Start MCP server using TTMSMCPStreamableHTTPTransport with Indy (General HTTP server)
Connect an MCP client, in my case it’s Claude Desktop.
Application crashes with EInvalidPointer

Thank you!

2

Hi,

Thank you for reporting. This had already been fixed internally just not yet synced to TMS AI Studio. We’ll make sure this is synced in the next release.

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