Find all the email addresses corresponding to a website or company name.
AI agents call hunter_domain_search to retrieve information from Hunter Io MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the Hunter.io API to search for and retrieve email addresses. It performs data retrieval with no side effects, no code execution, no data modification, and no destructive actions. The action is informational (finding emails for a domain) and analogous to a search or list operation.
From the tool's definition Tool is described as 'Find all the email addresses corresponding to a website or company name' — a lookup/search operation that retrieves data without modification.
Attacks that exploit this kind of access
Find all the email addresses corresponding to a website or company name. It is categorised as a Read tool in the Hunter Io MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Hunter Io MCP Server MCP server in PolicyLayer and add a rule for hunter_domain_search: 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 Hunter Io MCP Server. Nothing to install.
hunter_domain_search 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 hunter_domain_search 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 hunter_domain_search. 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.
hunter_domain_search is provided by the Hunter Io MCP Server MCP server (meerkats-ai/hunter-io-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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