Marlene Mhangami
Senior Developer Advocate specializing in Python and AI at Microsoft; computer scientist, keynote speaker, ACM Practitioner Board chair, former Python Software Foundation vice chair, and organizer of the first PyCon Africa.
VS Code Can Render MCP Tool Results as Interactive Apps
GitHub’s Marlene Mhangami and Liam Hampton argue that MCP apps turn chat from a text response surface into a place where tool output can be operated directly. In their VS Code demo, an MCP server profiles a Go app, returns data plus a reference to a bundled HTML UI, and VS Code renders the result as a sandboxed interactive flame graph inside Copilot chat. Their case is that the useful boundary is precise: tools provide data, resources provide the interface, and the host contains the app while keeping the user in context.
Playwright Lets Agents Test Feature Requests Before They Write Code
Microsoft’s Marlene Mhangami argues that AI-generated tests can make a codebase look healthier than it is, because agents often write tests that confirm their own implementation rather than validate the user-visible behavior a feature is meant to deliver. Her prescription is to reverse the common workflow: start from the feature request, have the agent write failing Playwright tests against expected behavior, then generate code to pass them. In a GitHub Copilot demo using the Playwright MCP server, she applies that approach to a toy-store search and filtering feature, with the browser showing the agent exercise the product experience directly.