AI agents call audit_tail to retrieve information from Mcpx without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical audit log data without modifying, executing, or destroying anything. It is a read-only query operation with minimal security risk. The 'Tier 0' designation and read-only constraint further confirm its benign nature.
From the tool's definition The tool is explicitly described as 'read-only' and returns audit log records. The operation is purely retrieval with no side effects: 'Return the last N records from the audit log.'
Attacks that exploit this kind of access
Return the last N records from the audit log (Tier 0, read-only). It is categorised as a Read tool in the Mcpx MCP Server, which means it retrieves data without modifying state.
Register the Mcpx MCP server in PolicyLayer and add a rule for audit_tail: 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 Mcpx. Nothing to install.
audit_tail 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 audit_tail 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 audit_tail. 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.
audit_tail is provided by the Mcpx MCP server (rmednitzer/relay-shell). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
audit_tail is one line of Mcpx's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →