mongodb_create_index · Multi-Database MCP Server MCP

WHAT IT DOES

What mongodb_create_index does on Multi-Database MCP Server

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

WHY IT NEEDS A POLICY

Why mongodb_create_index needs a policy

Creating an index is a reversible write operation that modifies the collection's metadata and structure but does not delete or alter existing documents. While indexes can impact performance, they are not destructive (can be dropped) and do not permanently remove data. The FULL mode requirement suggests intentional permissioning.

From the tool's definition Tool name 'mongodb_create_index' and description 'Create an index on a MongoDB collection (requires FULL mode)' indicate a data structure modification operation that creates a new index.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mongodb_create_index Rate-limited

mongodb_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": {
    "mongodb_create_index": {
      "limits": [
        {
          "counter": "mongodb_create_index_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about mongodb_create_index

What does the mongodb_create_index tool do? +

Create an index on a MongoDB collection (requires FULL mode). It is categorised as a Write tool in the Multi-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 mongodb_create_index? +

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

What risk level is mongodb_create_index? +

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

Can I rate-limit mongodb_create_index? +

Yes. Add a rate_limit block to the mongodb_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 mongodb_create_index completely? +

Set action: deny in the PolicyLayer policy for mongodb_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 mongodb_create_index? +

mongodb_create_index is provided by the Multi-Database MCP Server MCP server (nam088/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.