relate_knowledge · MemoDB MCP Server MCP: Risk & Policy

WHAT IT DOES

What relate_knowledge does on MemoDB MCP Server

AI agents use relate_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 relate_knowledge needs a policy

This tool creates new associations or connections between knowledge items, which is a write operation that modifies the knowledge base structure. It is reversible (relations can be deleted) and has a medium blast radius - misuse could create unwanted associations or pollute the knowledge graph, but cannot irreversibly destroy data or execute arbitrary code.

From the tool's definition Tool name 'relate_knowledge' and description 'Create relation between knowledge items' indicate creation of new relationships/links between existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

relate_knowledge Rate-limited

relate_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": {
    "relate_knowledge": {
      "limits": [
        {
          "counter": "relate_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 relate_knowledge

What does the relate_knowledge tool do? +

Create relation between knowledge items. 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 relate_knowledge? +

Register the MemoDB MCP Server MCP server in PolicyLayer and add a rule for relate_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 relate_knowledge? +

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

Can I rate-limit relate_knowledge? +

Yes. Add a rate_limit block to the relate_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 relate_knowledge completely? +

Set action: deny in the PolicyLayer policy for relate_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 relate_knowledge? +

relate_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.