Team Practices

Two Doors, One Gate Onboarding guardrails and power-user friction look like the same problem. They aren’t. June 2026 · 7 min · Karl-Heinz Reichel Table of Contents The Setup The Category Error We Already Made Once Two Layers, Not One Document Letting the Data Set the Threshold Accountability Instead of a Badge Closing Thought A few weeks ago we wrote about why we run AI coding sessions with two developers instead of one. Triplet programming works well as a transitional structure — a way to build shared fluency while the risk of agent-driven, codebase-wide changes is still high. ...

Over the past months, a question has been making the rounds in engineering circles: Is anyone doing “triplet programming” — two humans and an AI agent? We are. Here is why. The Setup When we introduced GitHub Copilot as an agentic coding assistant, the default assumption was that each developer would work one-on-one with the agent. That is not what we ended up doing. Instead, we run sessions with two developers and one agent. ...