List all configured domains on the Faber server
AI agents call faber_list_domains to retrieve information from Faber 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 and lists existing domain configurations. It has no side effects, does not modify data, does not execute operations, and does not delete anything. It is a simple read operation with minimal blast radius if misused by an AI agent—at worst it exposes information about configured domains.
From the tool's definition Tool name is 'faber_list_domains' and description states 'List all configured domains on the Faber server' — a query operation that retrieves information without modification or execution.
Attacks that exploit this kind of access
List all configured domains on the Faber server. It is categorised as a Read tool in the Faber MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Faber MCP Server MCP server in PolicyLayer and add a rule for faber_list_domains: 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 Faber MCP Server. Nothing to install.
faber_list_domains 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 faber_list_domains 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 faber_list_domains. 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.
faber_list_domains is provided by the Faber MCP Server MCP server (joshtrebilco/faber-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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