12 tools. 7 can modify or destroy data without limits.
4 destructive tools with no built-in limits. Policy required.
Last updated:
Verified server · catalogue entry verified 05/07/2026 · full schemas captured for 9 of 12 tools
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Full per-tool breakdown → Model it in the token calculator →
7 of Z Zero's 12 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.
PolicyLayer is an MCP gateway — it sits between your AI agents and Z Zero, and nothing reaches the server without passing your rules. These are the rules we recommend:
{
"auto_pay_checkout": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
} Financial tools should be explicitly enabled per use case, not open by default.
{
"report_checkout_fail": {
"limits": [
{
"counter": "report_checkout_fail_per_hour",
"window": "hour",
"max": 30,
"scope": "grant"
}
]
}
} Prevents bulk unintended modifications from agents caught in loops.
{
"check_balance": {
"limits": [
{
"counter": "check_balance_per_minute",
"window": "minute",
"max": 60,
"scope": "grant"
}
]
}
} Controls API costs and prevents retry loops from exhausting upstream rate limits.
Instant setup, no code required.
Other MCP servers with similar tools — same risk classification, starter policies for each.
Yes. The Z Zero server exposes 4 financial tools including auto_pay_checkout, cancel_payment_token, execute_payment. Without a policy, an autonomous agent can call these with no spend caps, no rate limits, and no approval flow. PolicyLayer lets you block financial tools by default, require human approval, or set per-tool rate limits — enforced on every call.
The Z Zero server has 2 write tools including report_checkout_fail, set_api_key. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach Z Zero.
12 tools across 5 categories: Destructive, Execute, Financial, Read, Write. 5 are read-only. 7 can modify, create, or delete data.
Register the Z Zero MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.
Deterministic rules across all 12 Z Zero tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Instant setup, no code required.
12 Z Zero tools catalogued and risk-classified — across an index of 43,000+ MCP servers.