delete_index

THE RISK

Critical Risk

Why delete_index needs a policy

Deleting an index irreversibly removes a database object and cannot be undone without recreation. While not as severe as dropping tables or data, it permanently alters the database schema and can degrade query performance. This qualifies as Destructive (irreversible modification) rather than Write (reversible changes).

From the tool's definition Tool name: 'delete_index'; description: 'Delete an index'. The verb 'Delete' combined with 'index' indicates irreversible removal of a database object.

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

POLICY

How to control delete_index

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

policy.json

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

delete_index 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 MSSQL 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 MSSQL MCP Server tools

Destructive delete_procedure Delete a stored procedure Destructive delete_view Delete a view Execute execute_procedure Execute a stored procedure with optional parameters Write create_index Create a new index Write create_procedure Create a new stored procedure Write create_table Create a new table in the database Write create_view Create a new view Write modify_procedure Modify an existing stored procedure

All 23 MSSQL 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 MSSQL 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_index

What does the delete_index tool do? +

Delete an index. It is categorised as a Destructive tool in the MSSQL 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_index? +

Register the MSSQL MCP Server MCP server in PolicyLayer and add a rule for delete_index: 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 MSSQL MCP Server. Nothing to install.

What risk level is delete_index? +

delete_index 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_index? +

Yes. Add a rate_limit block to the delete_index 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_index completely? +

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

delete_index is provided by the MSSQL MCP Server MCP server (jensenloke/mcp-sqlserver-pro). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MSSQL MCP Server tool call.

Start from MSSQL 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 →