delete_ontology

THE RISK

Critical Risk

Why delete_ontology needs a policy

This tool irreversibly deletes entire ontology objects, which are foundational metadata structures in Microsoft Fabric. The deletion is permanent and will break any dependent relationships, entity types, and data bindings. This is a core destructive operation that cannot be reversed through normal means, making it Destructive rather than merely Write.

From the tool's definition Tool name 'delete_ontology' and description 'Delete an ontology' directly indicate irreversible deletion of data structures. Confirmed by server description stating 'full CRUD control of Ontology items' where 'D' = Delete.

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

POLICY

How to control delete_ontology

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

policy.json

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

delete_ontology 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 Fabric Ontology 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 Fabric Ontology MCP Server tools

Destructive remove_contextualization Remove a contextualization from a relationship type. Destructive remove_data_binding Remove a data binding from an entity type. Destructive remove_document Remove a document from an entity type by its URL. Destructive remove_entity_type Remove an entity type from an ontology. Destructive remove_property Remove a property from an entity type. Destructive remove_relationship_type Remove a relationship type from an ontology. Write add_contextualization add_contextualization Write add_data_binding add_data_binding

All 45 Fabric Ontology MCP Server tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Fabric Ontology 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 delete_ontology

What does the delete_ontology tool do? +

Delete an ontology. It is categorised as a Destructive tool in the Fabric Ontology 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 delete_ontology? +

Register the Fabric Ontology MCP Server MCP server in PolicyLayer and add a rule for delete_ontology: 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 Fabric Ontology MCP Server. Nothing to install.

What risk level is delete_ontology? +

delete_ontology 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 delete_ontology? +

Yes. Add a rate_limit block to the delete_ontology 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 delete_ontology completely? +

Set action: deny in the PolicyLayer policy for delete_ontology. 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 delete_ontology? +

delete_ontology is provided by the Fabric Ontology MCP Server MCP server (tmdaidevs/ontology-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Fabric Ontology MCP Server tool call.

Start from Fabric Ontology 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 →