Normandy.Behaviours.PolicyEngine behaviour (normandy v1.2.0)

Contract for per-tool-call policy decisions, consulted at the dispatch chokepoint via Normandy.Behaviours.Config.to_pipeline/1.

check/2 returns one of:

{:allow, meta} — proceed; meta is opaque allow-context.
{:deny, info} — block; info may carry :reason, :rule_id, :rationale. The rationale is fed back into the model context by the chokepoint, so the model learns why a constraint exists.
{:needs_approval, info} — park for human approval (interim-tagged in Phase 1; real parking lands in Phase 4).

The default impl AllowAll preserves current (allow-everything) behavior.

Summary

call()

ctx()

decision()

check(call, ctx)

@type call() :: term()

@type ctx() :: map()

@type decision() :: {:allow, map()} | {:deny, map()} | {:needs_approval, map()}

@callback check(call(), ctx()) :: decision()