Repeatability
Medium
The structural pattern — extract classes, apply DI, write docs — is repeatable, but the specific judgment calls (where to draw class boundaries, what to inject vs. instantiate, how to handle legacy globals) vary with every codebase and require reading the actual code carefully each time.
Ambiguity Tolerance
Medium
'Clean OOP structure' and 'proper class hierarchy' are partially defined but leave significant room for interpretation; success criteria like 'unit-testable' are clearer, but there is no explicit test suite or acceptance criteria to verify against, so the agent cannot self-validate completeness.
Data & Tool Availability
Medium
The agent needs the actual 400-line file (and ideally the surrounding 12 files for context on shared globals and dependencies), which the user has not yet provided; assuming file access is granted, the agent has everything it needs to produce the refactor, but cannot run tests or execute the code to verify behavior.
Error Cost
High
This is payment-processing code — a subtle behavioral regression (rounding error, missed validation, altered transaction flow) could cause financial loss, compliance failures, or silent data corruption; errors are reversible only if version control is in place and the regression is caught before deployment.
Human Judgment Required
Medium
Architectural decisions (e.g., how to handle legacy side effects, whether to introduce a gateway abstraction layer, PCI-DSS surface area) benefit from domain knowledge and organizational context that an agent lacks; the mechanical refactoring is automatable, but the design choices need a senior developer's sign-off.