mongo_create_index · Mcp Database MCP: Risk & Policy

WHAT IT DOES

What mongo_create_index does on Mcp Database

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

WHY IT NEEDS A POLICY

Why mongo_create_index needs a policy

Index creation is a structural modification that persists in the database, making it a Write operation rather than Read. It is not Destructive because indexes can be dropped without data loss, nor Execute because it doesn't run arbitrary code or shell commands. Severity is medium because index creation can impact query performance and resource usage if misapplied, but doesn't directly expose or delete data.

From the tool's definition Tool name 'mongo_create_index' and description 'Create an index on a MongoDB collection' indicate creation/modification of database metadata.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mongo_create_index Rate-limited

mongo_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": {
    "mongo_create_index": {
      "limits": [
        {
          "counter": "mongo_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 Database, so you can run agents against it safely.

FAQ

Questions about mongo_create_index

What does the mongo_create_index tool do? +

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

How do I enforce a policy on mongo_create_index? +

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

What risk level is mongo_create_index? +

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

Can I rate-limit mongo_create_index? +

Yes. Add a rate_limit block to the mongo_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 mongo_create_index completely? +

Set action: deny in the PolicyLayer policy for mongo_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 mongo_create_index? +

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