# Code Review — Step 4: Add tests

## Verdict

**Approve.** The Step 4 test additions cover the requested registration, success, response-shaping, strict argument validation, error mapping, cancellation, context propagation, and forbidden-output cases. The two gaps from the prior code review have been addressed: full-mode output is included in the forbidden-field assertion, and the handler test now verifies the request context reaches the fake profile client via a sentinel value.

## Findings

No blocking findings.

## Validation run

- `go test ./internal/tools ./...` — passed
