Repeatability
High
The task is structurally identical every time: given a set of file types, size limits, and attack vectors, produce middleware and tests. There is no unique judgment required per instance—the pattern is stable and well-understood.
Ambiguity Tolerance
High
Success criteria are concrete: multer/joi integration, magic-byte checking, 50 MB limit, 8 named attack vector tests. An agent can verify its own output against these criteria without subjective interpretation.
Data & Tool Availability
High
The agent needs only the existing codebase (or a description of the 12 endpoints) and access to npm package documentation, both of which are readily available. No live credentials, external APIs, or proprietary data are required to write and test the middleware.
Error Cost
Medium
Incorrect validation logic could leave security gaps or break legitimate uploads, but the output is code that must be reviewed and tested before deployment—errors are catchable before they reach production. The reversibility is high, but the security context means a bad merge has real consequences.
Human Judgment Required
Low
No taste, ethics, or relationship context is needed. The decisions—which MIME types to allow, what constitutes a corrupted header, how to structure test fixtures—are technical and well-documented in the security and Node.js ecosystem.