AI agents call acf_list_field_groups to retrieve information from Wordpress without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates metadata about ACF (Advanced Custom Fields) field groups without modifying, executing, or destroying anything. It is purely informational and poses minimal risk even if misused by an agent, as it only reveals structural information about custom fields already present on the WordPress site.
From the tool's definition Tool name includes 'list', description explicitly states 'Read-only', and the operation is to 'list ACF field groups registered on the site' — a query operation with no side effects.
Attacks that exploit this kind of access
Use to list ACF field groups registered on the site. Read-only. It is categorised as a Read tool in the Wordpress MCP Server, which means it retrieves data without modifying state.
Register the Wordpress MCP server in PolicyLayer and add a rule for acf_list_field_groups: 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 Wordpress. Nothing to install.
acf_list_field_groups 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 acf_list_field_groups 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 acf_list_field_groups. 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.
acf_list_field_groups is provided by the Wordpress MCP server (@adsim/wordpress-mcp-server). 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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