Pragma Labs ยท BlogPragma Labs is an indie studio from Vietnam building developer tools and MCP applications.https://pragmalabs.techChatGPT's Real Session ID Isn't Where MCP Says It Should Behttps://pragmalabs.tech/blog/chatgpt-real-session-in-metahttps://pragmalabs.tech/blog/chatgpt-real-session-in-metaChatGPT throws away the standard MCP session on every tool call. But it carries its own session ID inside the JSON-RPC body, in a place no header-based proxy can see. Here's where it lives, why OpenAI put it there, and how mcpr surfaces it.Tue, 05 May 2026 00:00:00 GMTChatGPT Creates a New MCP Session for Every Tool Call. Claude Doesn't.https://pragmalabs.tech/blog/chatgpt-vs-claude-mcp-sessionshttps://pragmalabs.tech/blog/chatgpt-vs-claude-mcp-sessionsI caught ChatGPT and Claude red-handed using the same MCP server completely differently. One creates a fresh session per tool call. The other reuses one. Here's the data from the proxy dashboard, and why it matters for every MCP server developer.Tue, 07 Apr 2026 00:00:00 GMTMCP App CSP Explained: Why Your Widget Won't Render in ChatGPT and Claudehttps://pragmalabs.tech/blog/mcp-app-csp-explainedhttps://pragmalabs.tech/blog/mcp-app-csp-explainedYour MCP App widget loads a blank iframe. No error. No hint. Here's exactly what's happening: the five CSP domain arrays, the mistakes that break your widget, and how to debug them.Fri, 03 Apr 2026 00:00:00 GMTIntroducing MCPR: Open-Source Proxy for MCP Appshttps://pragmalabs.tech/blog/introducing-mcprhttps://pragmalabs.tech/blog/introducing-mcprMCPR is an open-source, MCP-aware reverse proxy that fixes CSP issues, handles auth, and observes every tool call, so you can ship MCP apps without the infrastructure headaches.Thu, 02 Apr 2026 00:00:00 GMT