Retrieve a list of contacts from Omnisend. Each contact can be identified by multiple identifiers (email, phone) with corresponding channels. The response includes pagination information (next/previous cursor, limit, offset).
AI agents call listContacts to retrieve information from Omnisend MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves contact data without side effects. It queries existing data and returns paginated results. There is no capability to create, modify, delete, or execute operations. The blast radius of misuse is limited to potential exposure of contact information, which is a read-level risk.
From the tool's definition Tool name 'listContacts' and description explicitly states 'Retrieve a list of contacts' with pagination support. No modification, deletion, or execution capabilities mentioned.
Attacks that exploit this kind of access
Retrieve a list of contacts from Omnisend. Each contact can be identified by multiple identifiers (email, phone) with corresponding channels. The response includes pagination information (next/previous cursor, limit, offset). It is categorised as a Read tool in the Omnisend MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Omnisend MCP Server MCP server in PolicyLayer and add a rule for listContacts: 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 Omnisend MCP Server. Nothing to install.
listContacts 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 listContacts 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 listContacts. 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.
listContacts is provided by the Omnisend MCP Server MCP server (plutzilla/omnisend-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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