AI agents call list_agents to retrieve information from Retellai without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates existing agent resources without modifying, executing, or deleting anything. It is a straightforward Read operation. Severity is low because listing agents presents minimal risk; it may expose metadata about available agents but does not execute code, modify state, or cause irreversible changes.
From the tool's definition Tool name is 'list_agents' and description states 'Lists all Retell agents' — a pure query/retrieval operation with no side effects.
Attacks that exploit this kind of access
Lists all Retell agents. It is categorised as a Read tool in the Retellai MCP Server, which means it retrieves data without modifying state.
Register the Retellai MCP server in PolicyLayer and add a rule for list_agents: 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 Retellai. Nothing to install.
list_agents 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_agents 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_agents. 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_agents is provided by the Retellai MCP server (@abhaybabbar/retellai-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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