variables_delete

THE RISK

Critical Risk

Why variables_delete needs a policy

The naming convention '_delete' combined with the server context (Piwik PRO analytics tag management) strongly suggests this tool permanently removes variables from analytics configuration. This is a destructive operation that cannot be undone and affects analytics infrastructure. High severity due to potential data loss and analytics disruption.

From the tool's definition Tool name is 'variables_delete' with no description provided. The suffix '_delete' indicates irreversible deletion of data.

Documented attack patterns abuse exactly the kind of access variables_delete gives an agent:

POLICY

How to control variables_delete

PolicyLayer is an MCP gateway — it sits between your AI agents and Piwik PRO MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for variables_delete:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "variables_delete"
  ]
}

variables_delete disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Piwik PRO MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Piwik PRO MCP Server tools

Destructive analytics_annotations_delete Delete a user annotation by ID. Destructive tags_delete Delete a tag from Piwik PRO Tag Manager. Destructive tracker_settings_app_delete tracker_settings_app_delete Destructive triggers_delete Delete a trigger from Piwik PRO Tag Manager. Execute analytics_query_execute analytics_query_execute Execute versions_publish_draft versions_publish_draft Write analytics_annotations_create analytics_annotations_create Write analytics_annotations_update analytics_annotations_update

All 66 Piwik PRO MCP Server tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Piwik PRO MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about variables_delete

What does the variables_delete tool do? +

variables_delete. It is categorised as a Destructive tool in the Piwik PRO MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on variables_delete? +

Register the Piwik PRO MCP Server MCP server in PolicyLayer and add a rule for variables_delete: 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 Piwik PRO MCP Server. Nothing to install.

What risk level is variables_delete? +

variables_delete is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit variables_delete? +

Yes. Add a rate_limit block to the variables_delete 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.

How do I block variables_delete completely? +

Set action: deny in the PolicyLayer policy for variables_delete. 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.

What MCP server provides variables_delete? +

variables_delete is provided by the Piwik PRO MCP Server MCP server (piwikpro/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Piwik PRO MCP Server tool call.

Start from Piwik PRO MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →