Apple’s macOS 27.3 beta adds native Markdown rendering to Quick Look

This is a small but telling platform move: Markdown previews in Finder lower the friction for anyone who reads or writes documentation, notes or agent-readable skill files, and the tie-in to Siri app skills signals Apple treating Markdown as infrastructure rather than a niche format. It matters most to developers building Siri integrations and to note-taking and documentation tooling that currently relies on extensions for previews. Whether Markdown's role in Apple's AI tooling expands beyond skill files is the open question worth watching.