AI agents call list_regexes to retrieve information from Firegex without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays configuration data (regex patterns) without modifying system state or triggering external operations. It is a straightforward query operation with no side effects, fitting the Read category. Severity is low because exposure of regex patterns alone poses minimal risk—they are configuration artifacts rather than sensitive credentials or system controls.
From the tool's definition Tool name is 'list_regexes' and description states it 'List[s] regexes attached to a service' with read-only output ('plain text'). No creation, modification, deletion, execution, or financial operations are implied.
Attacks that exploit this kind of access
List regexes attached to a service. The regex field is plain text. It is categorised as a Read tool in the Firegex MCP Server, which means it retrieves data without modifying state.
Register the Firegex MCP server in PolicyLayer and add a rule for list_regexes: 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 Firegex. Nothing to install.
list_regexes 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_regexes 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_regexes. 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_regexes is provided by the Firegex MCP server (umbra2728/firegex-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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