mongo_update_one · Mcp Database MCP: Risk & Policy

WHAT IT DOES

What mongo_update_one does on Mcp Database

AI agents use mongo_update_one 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_update_one needs a policy

This tool modifies existing MongoDB documents through an update operation. Updates are reversible (can be undone by updating back to previous values), distinguishing this from destructive operations. The severity is medium because a misconfigured update could affect one or more documents, but the scope is limited to a single document update operation.

From the tool's definition Tool name 'mongo_update_one' and description 'Update one document in a MongoDB collection' indicate a modification operation that creates or modifies data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mongo_update_one Rate-limited

mongo_update_one 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_update_one": {
      "limits": [
        {
          "counter": "mongo_update_one_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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_update_one

What does the mongo_update_one tool do? +

Update one document in 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_update_one? +

Register the Mcp Database MCP server in PolicyLayer and add a rule for mongo_update_one: 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_update_one? +

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

Can I rate-limit mongo_update_one? +

Yes. Add a rate_limit block to the mongo_update_one 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_update_one completely? +

Set action: deny in the PolicyLayer policy for mongo_update_one. 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_update_one? +

mongo_update_one 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.