AI agents call vast_list_zones to retrieve information from AdButler without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
limit | number | — | Max results to return (default 100, max 100) |
offset | number | — | Pagination offset |
Parameters from the server's own tool schema.
The verb 'list' combined with the passive information retrieval context (zones are configuration/organizational entities) confirms this is a Read operation. Listing zones does not modify, delete, or execute any actions—it only retrieves existing data. Severity is low because accessing a list of advertising zones poses minimal risk even if exposed to an untrusted agent.
From the tool's definition Tool name 'vast_list_zones' with description 'List all VAST zones' indicates a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
List all VAST zones. It is categorised as a Read tool in the AdButler MCP Server, which means it retrieves data without modifying state.
vast_list_zones accepts 2 parameters: limit, offset. The full parameter table on this page comes from the server's own tool schema.
Register the AdButler MCP server in PolicyLayer and add a rule for vast_list_zones: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches AdButler. Nothing to install.
vast_list_zones is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the vast_list_zones rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for vast_list_zones. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
vast_list_zones is provided by the AdButler MCP server (adbutler/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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