Consolidating validation logic into a tested npm package is a clean win for a code agent.

Refactoring scattered regex patterns into a structured utility is a structurally consistent coding task. The pattern of consolidate-test-package is repeatable and well within established conventions.

Success criteria are mostly crisp — passing tests, correct regex per locale, valid npm package structure — but the 6 countries and exact format rules aren't specified, requiring the agent to make reasonable assumptions about which locales and formats to support.

The agent needs access to the existing codebase to extract scattered patterns, plus knowledge of locale-specific validation rules. If given file access and a list of target countries, this is straightforward; without the existing code, the agent must infer or reconstruct.

This is a utility refactor with a test suite as a safety net — errors are caught before deployment and the output is easily reviewed by a developer. No production data or irreversible actions are involved.

Regex patterns for email, phone, and postal codes are well-documented standards. Locale rules are publicly known. A human review pass before merging is prudent but the core work doesn't require intuition or taste.