AI agents call drupal_list_taxonomy_terms to retrieve information from Drupal 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 taxonomy terms from a Drupal vocabulary. Listing is a read-only query that does not create, modify, delete, or execute external operations. The risk is minimal as it only surfaces existing data without causing any state changes.
From the tool's definition Tool description explicitly states 'List terms in a vocabulary' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
List terms in a vocabulary (e.g. It is categorised as a Read tool in the Drupal MCP Server, which means it retrieves data without modifying state.
Register the Drupal MCP server in PolicyLayer and add a rule for drupal_list_taxonomy_terms: 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 Drupal. Nothing to install.
drupal_list_taxonomy_terms 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 drupal_list_taxonomy_terms 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 drupal_list_taxonomy_terms. 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.
drupal_list_taxonomy_terms is provided by the Drupal MCP server (lucaspretti/drupal-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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