Stop coding agents from repeating mistakes the project already learned.

Code can compile and tests can pass while architecture boundaries, data assumptions, or user flows quietly regress. The validation plan should be selected from the part of the system affected by the run, including the checks that previously caught similar failures.

Kaplira keeps known errors with their prevention references. When a future task touches the same surface, the run can acknowledge those constraints and report the exact validation evidence used.

• Known errors attached to affected files and architecture blocks
• Guardrails available before implementation begins
• Required tests selected from the actual blast radius
• Failed repeated approaches detected by an anti-loop gate

A line-by-line diff cannot always explain which behavior was added, preserved, replaced, or left unresolved. A structured before-and-after representation gives reviewers the product meaning of the change alongside the source evidence.

That representation also helps future agents avoid restoring behavior that was intentionally removed.

Regression prevention improves over time when the outcome of one run becomes context for the next. Accepted fixes become protections, unresolved risks remain attributable, and validation commands stay connected to the conditions they prove.