31 tools. 21 can modify or destroy data without limits.
1 destructive tool with no built-in limits. Policy required.
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Financial operations (transfer_subscription) can move real money. An agent caught in a loop could drain accounts before anyone notices.
Write operations (create_alias_by_subscription, create_or_update_alias, create_segment) modify state. Without rate limits, an agent can make hundreds of changes in seconds — faster than any human can review or revert.
Execute tools (start_live_activity) trigger processes with side effects. Builds, notifications, workflows — all fired without throttling.
transfer_subscription:
rules:
- action: deny Financial tools should be explicitly enabled per use case, not open by default.
create_alias_by_subscription:
rules:
- rate_limit: 30/hour Prevents bulk unintended modifications from agents caught in loops.
get_segment:
rules:
- rate_limit: 60/minute Controls API costs and prevents retry loops from exhausting upstream rate limits.
Yes. The OneSignal server exposes 1 financial tools including transfer_subscription. Without a policy, an autonomous agent can call these with no spend caps, no rate limits, and no approval flow. Intercept lets you block financial tools by default or set per-tool rate limits.
The OneSignal server has 19 write tools including create_alias_by_subscription, create_or_update_alias, create_segment. Set rate limits in your policy file -- for example, rate_limit: 10/hour prevents an agent from making more than 10 modifications per hour. Intercept enforces this at the transport layer.
31 tools across 4 categories: Execute, Financial, Read, Write. 10 are read-only. 21 can modify, create, or delete data.
One line change. Instead of running the OneSignal server directly, prefix it with Intercept: intercept -c onesignal-onesignal.yaml -- npx -y @onesignal/onesignal. Download a pre-built policy from policylayer.com/policies/onesignal-onesignal and adjust the limits to match your use case.
Starter policies available for each. Same risk classification, same one-command setup.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.