create_entities · Knowledge Graph MCP Server MCP

WHAT IT DOES

What create_entities does on Knowledge Graph MCP Server

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

WHY IT NEEDS A POLICY

Why create_entities needs a policy

This tool creates structured data entries in a persistent knowledge graph. While creation is reversible (entities can be deleted), it modifies the graph's state and could pollute or alter the knowledge base if an AI agent creates entities with incorrect, misleading, or numerous entries. The blast radius is moderate—corruption of the knowledge graph without data loss—making this Write rather than Destructive.

From the tool's definition Tool name and description: 'Create new entities in the knowledge graph' — the verb 'create' indicates irreversible addition of data structures to persistent storage (JSON file-backed knowledge graph).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_entities Rate-limited

create_entities 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": {
    "create_entities": {
      "limits": [
        {
          "counter": "create_entities_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 Knowledge Graph MCP Server, so you can run agents against it safely.

FAQ

Questions about create_entities

What does the create_entities tool do? +

Create new entities in the knowledge graph. It is categorised as a Write tool in the Knowledge Graph 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 create_entities? +

Register the Knowledge Graph MCP Server MCP server in PolicyLayer and add a rule for create_entities: 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 Knowledge Graph MCP Server. Nothing to install.

What risk level is create_entities? +

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

Can I rate-limit create_entities? +

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

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

create_entities is provided by the Knowledge Graph MCP Server MCP server (yuchoe/knowledge-graph-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.