Catches the mistakes coding agents repeat before they merge: a pull-request gate with no model call and no API key.
Short answer: Deduplicate event_id with monotonic state transitions. Gateways send an event more than once. Without a check the customer is charged or upgraded twice.
Group: Billing and money. Status: stable. Generated from the rule definitions; do not edit by hand.
Playground: https://brevio.pro/tools/agent-guard-playground?rule=R3.1
Idempotent webhook processing: deduplicate event_id with monotonic state transitions.
Gateways send an event more than once. Without a check the customer is charged or upgraded twice.
await applyEvent(event);
if (await seen(event.id)) return;
await applyEvent(event);
await markSeen(event.id);
dev_rules.slice_micro_rules).A person can silence one finding with brevio-core: ignore R3.1 -- reason on the line or the line above. Without the reason it does not count. An agent cannot silence it: the agent hook and the MCP tools never honour the comment, and a pull request that adds one is reported until a reviewer allows it. Fixing the code is still the better answer.
To change what the rule flags, edit its definition in dev_rules.py or code_rules/__init__.py. That is a code change and is reviewed like one.