Repeatability
High
This is a well-understood engineering pattern — webhook deduplication, signature validation, and exponential backoff are solved problems with established implementations. The structure is nearly identical across projects, making it highly repeatable.
Ambiguity Tolerance
High
The four deliverables are explicitly named: signature validation, deduplication table, retry logic, and unit tests covering failure scenarios. Success is objectively verifiable by running the tests and inspecting the implementation.
Data & Tool Availability
Medium
The agent needs the existing Flask app code, PostgreSQL schema, and Stripe webhook secret to produce accurate, non-generic output. Without these, it will write plausible but potentially mismatched code that requires significant human rework.
Error Cost
Medium
Bugs in a payment webhook handler can cause missed charges, duplicate invoices, or silent failures — real financial consequences. However, the task is additive and the existing tests plus code review before deployment make errors recoverable before they hit production.
Human Judgment Required
Low
The engineering decisions here — idempotency key strategy, backoff parameters, table schema — are conventional and well-documented. No significant taste, ethics, or relationship judgment is needed; a senior engineer review of the output is sufficient.