create_index · MCP Server MySQL MCP: Risk & Policy

WHAT IT DOES

What create_index does on MCP Server MySQL

AI agents use create_index to create or update resources in MCP Server MySQL — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Server MySQL environment.

WHY IT NEEDS A POLICY

Why create_index needs a policy

Creating an index modifies database schema and structure in a way that is reversible (indices can be dropped), but affects performance and storage. This is a Write operation because it creates/modifies database objects.

From the tool's definition Tool name 'create_index' and description 'Create an index on a table' indicate a schema modification operation that alters database structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_index Rate-limited

create_index stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_index": {
      "limits": [
        {
          "counter": "create_index_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Server MySQL, so you can run agents against it safely.

FAQ

Questions about create_index

What does the create_index tool do? +

Create an index on a table. It is categorised as a Write tool in the MCP Server MySQL MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_index? +

Register the MCP Server MySQL MCP server in PolicyLayer and add a rule for create_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 MCP Server MySQL. Nothing to install.

What risk level is create_index? +

create_index is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_index? +

Yes. Add a rate_limit block to the create_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 create_index completely? +

Set action: deny in the PolicyLayer policy for create_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 create_index? +

create_index is provided by the MCP Server MySQL MCP server (nilsir/mcp-server-mysql). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.