Use cases

What people build mirrors for: checks before a merge, prompt changes, new tools, demos.

• Pre-merge checks for agents Run an agent's recorded conversations against a twin before a prompt or tool change merges.
• Trying prompt changes safely Compare an agent's decisions before and after a prompt change on the same seeded world.
• Adding a tool Give a new tool a twin-side implementation before the real backend exists.
• Demo environments A twin seeded with a scenario is a demo backend that never runs out of state.
• Tracking regressions over time Each build reports drift per tool; the builds screen shows what changed between two builds.