R018 · drift-guardrail

Code: R018
Slug: drift-guardrail
Tier: heuristic
Default severity: warning
Packages: recommended, strict
Locked: No
Doc: https://doraval.dev/reference/rules/R018

Guardrail presence (heuristic)


What	Heuristic: body states hard constraints with MUST / MUST NOT (or equivalent guardrails).
Why	Preferences without bounds leave the agent free to invent unsafe shortcuts. Constraints set the right level of freedom.

How to fix

Add a short guardrail section:

## Constraints
- MUST run tests before opening a PR.
- MUST NOT push directly to main.

Put “do not use when…” in the description when over-trigger is the risk (R014).