AI agents call get_aggregated_hook_metrics to retrieve information from Zhook without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves historical metrics for a webhook hook—a read-only operation that has no impact on the webhook configuration, data, or system state. It allows filtering by date ranges but does not create, modify, or delete any resources. The action is informational and non-destructive.
From the tool's definition Tool name 'get_aggregated_hook_metrics' and description 'Get historical aggregated metrics for a specific hook with custom date ranges' indicate retrieval of existing metrics data without modification or side effects.
Attacks that exploit this kind of access
Get historical aggregated metrics for a specific hook with custom date ranges. It is categorised as a Read tool in the Zhook MCP Server, which means it retrieves data without modifying state.
Register the Zhook MCP server in PolicyLayer and add a rule for get_aggregated_hook_metrics: 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 Zhook. Nothing to install.
get_aggregated_hook_metrics 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 get_aggregated_hook_metrics 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 get_aggregated_hook_metrics. 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.
get_aggregated_hook_metrics is provided by the Zhook MCP server (zhookteam/zhook-mcp). 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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