db_create_index · Database MCP Server MCP: Risk & Policy

WHAT IT DOES

What db_create_index does on Database MCP Server

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

WHY IT NEEDS A POLICY

Why db_create_index needs a policy

Creating an index is a reversible structural modification to a database schema. While it affects performance and schema composition, it can be undone via DROP INDEX. This places it in the Write category rather than Destructive (which requires irreversibility).

From the tool's definition Tool name 'db_create_index' and description 'Create an index' indicate a database modification operation. Index creation is a DDL (Data Definition Language) statement that modifies database schema structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

db_create_index Rate-limited

db_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": {
    "db_create_index": {
      "limits": [
        {
          "counter": "db_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 Database MCP Server, so you can run agents against it safely.

FAQ

Questions about db_create_index

What does the db_create_index tool do? +

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

How do I enforce a policy on db_create_index? +

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

What risk level is db_create_index? +

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

Can I rate-limit db_create_index? +

Yes. Add a rate_limit block to the db_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 db_create_index completely? +

Set action: deny in the PolicyLayer policy for db_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 db_create_index? +

db_create_index is provided by the Database MCP Server MCP server (roilanrodriguez55/database-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.