List Firefox Relay random masks with optional filtering.
AI agents call relay_list_random_masks to retrieve information from Firefox Relay without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing Firefox Relay masks without modifying, creating, deleting, or executing anything. It is a read-only operation that returns data to the user.
From the tool's definition Tool name contains 'list' and description states 'List Firefox Relay random masks with optional filtering' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
List Firefox Relay random masks with optional filtering. It is categorised as a Read tool in the Firefox Relay MCP Server, which means it retrieves data without modifying state.
Register the Firefox Relay MCP server in PolicyLayer and add a rule for relay_list_random_masks: 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 Firefox Relay. Nothing to install.
relay_list_random_masks 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 relay_list_random_masks 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 relay_list_random_masks. 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.
relay_list_random_masks is provided by the Firefox Relay MCP server (nazar256/firefox-relay-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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