Glossary
Agent Regression
Definition
A website or interface change that causes an agent task or machine-facing capability that previously worked to fail or materially degrade.
Context
Regressions are the agent-era counterpart of a broken build — a deploy that a human tester would wave through can silently break an automated flow the site never explicitly tests. Common causes include a renamed form field, a restructured DOM an agent's selectors relied on, or a new anti-bot check that blocks the very traffic a site meant to allow. Detecting these requires re-running the same agent task after every deploy and comparing outcomes, the same way a CI pipeline reruns unit tests.