Use when the user asks about Marc Sloan's talk "Harness engineering beyond code — product & design constraints for agents" (Tessl DevCon, June 2026) — including questions about why product/design context lives outside the codebase, how agent harnesses should evolve to handle Figma/Notion/Linear/CRM context, Figma Code Connect and Dev Mode lessons, MCP servers as a bridge, context drift between design systems and code, dedicated design-system maintenance teams, the three (or four) directions the harness might evolve, non-developers contributing PRs, or verbatim quotes from the talk.