Regression Check

Use this skill when

• reviewing a change before merge
• evaluating a refactor
• modifying runtime-critical code
• changing schemas, statuses, or behaviour

Goals

• expose hidden breakage risk
• protect existing behaviour
• define follow-up checks clearly

Regression areas to inspect

• public contracts
• cross-module contracts
• state transitions
• event ordering
• retry behaviour
• resume behaviour
• trace completeness
• audit/logging
• tool or MCP payloads

Output contract

Return:

• likely regression areas
• why each is at risk
• recommended checks
• confidence level