List users in a room
AI agents call agent_communication_list_room_users to retrieve information from Agent Communication 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 user presence/membership information from a room without modifying, executing, or deleting anything. It performs a simple enumeration of existing data, which is characteristic of Read-category tools. The blast radius is minimal as misuse would only expose room membership information, not enable destructive or financial actions.
From the tool's definition Tool name 'list_room_users' and description 'List users in a room' indicate a retrieval operation with no side effects. This is a query operation that returns information about room participants.
Attacks that exploit this kind of access
List users in a room. It is categorised as a Read tool in the Agent Communication MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Agent Communication MCP Server MCP server in PolicyLayer and add a rule for agent_communication_list_room_users: 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 Agent Communication MCP Server. Nothing to install.
agent_communication_list_room_users 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 agent_communication_list_room_users 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 agent_communication_list_room_users. 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.
agent_communication_list_room_users is provided by the Agent Communication MCP Server MCP server (mkxultra/agent-communication-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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