Strategy — Legacy-Safe Edits

When to use

• The agent is about to edit legacy procedural PHP or an older CMS codebase (e.g. Bitrix CIBlockElement, $APPLICATION, global includes).
• The user wants a bug fixed in old, legacy code and explicitly does not want it rewritten (for example, "поправь баг в старом коде, не переписывай").
• The change must be isolated to the legacy module and easy to revert as a single patch if it misbehaves.

When NOT to use