add_knowledge · MemoDB MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_knowledge does on MemoDB MCP Server

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

WHY IT NEEDS A POLICY

Why add_knowledge needs a policy

The tool creates or adds new knowledge entries, which is a reversible Write operation. It does not execute code, delete data, or move financial resources. Severity is medium because unauthorized knowledge base modifications could corrupt user data or introduce malicious information into a knowledge base, but the operation is reversible via deletion or updates.

From the tool's definition Tool name 'add_knowledge' and description 'Add new knowledge' indicate creation of new data entries in a knowledge base. Context shows this is part of a knowledge management system within MemoDB MCP Server.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_knowledge Rate-limited

add_knowledge 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": {
    "add_knowledge": {
      "limits": [
        {
          "counter": "add_knowledge_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 MemoDB MCP Server, so you can run agents against it safely.

FAQ

Questions about add_knowledge

What does the add_knowledge tool do? +

Add new knowledge. It is categorised as a Write tool in the MemoDB 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 add_knowledge? +

Register the MemoDB MCP Server MCP server in PolicyLayer and add a rule for add_knowledge: 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 MemoDB MCP Server. Nothing to install.

What risk level is add_knowledge? +

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

Can I rate-limit add_knowledge? +

Yes. Add a rate_limit block to the add_knowledge 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 add_knowledge completely? +

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

add_knowledge is provided by the MemoDB MCP Server MCP server (wuyunmei/momedb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.