AI agents call list_hooks 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.
The tool retrieves and queries existing webhook configurations without modifying, executing, or deleting any data. It is purely informational and fits the 'Read' category for data retrieval with no side effects. Severity is low because disclosing webhook metadata poses limited risk compared to other operations available on this server (create, delete operations exist separately).
From the tool's definition Tool name is 'list_hooks' and description states it 'List all webhooks configured in the Zhook account. Returns hook IDs, URLs, and active status.' This is a retrieval operation with no side effects.
Attacks that exploit this kind of access
List all webhooks configured in the Zhook account. Returns hook IDs, URLs, and active status. 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 list_hooks: 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.
list_hooks 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 list_hooks 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 list_hooks. 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.
list_hooks 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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