knowledge_graph · Exa Websets MCP Server MCP: Risk & Policy

WHAT IT DOES

What knowledge_graph does on Exa Websets MCP Server

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

WHY IT NEEDS A POLICY

Why knowledge_graph needs a policy

The tool maintains (creates/updates) connections in a knowledge graph derived from webset results. This is a Write operation as it builds and modifies graph relationships. It is not purely Read since it actively maintains state.

From the tool's definition 'Maintain connections between webset results in an onboard graph' — 'maintain' implies creating and updating graph relationships

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

knowledge_graph Rate-limited

knowledge_graph 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": {
    "knowledge_graph": {
      "limits": [
        {
          "counter": "knowledge_graph_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 Exa Websets MCP Server, so you can run agents against it safely.

FAQ

Questions about knowledge_graph

What does the knowledge_graph tool do? +

Maintain connections between webset results in an onboard graph. It is categorised as a Write tool in the Exa Websets 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 knowledge_graph? +

Register the Exa Websets MCP Server MCP server in PolicyLayer and add a rule for knowledge_graph: 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 Exa Websets MCP Server. Nothing to install.

What risk level is knowledge_graph? +

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

Can I rate-limit knowledge_graph? +

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

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

knowledge_graph is provided by the Exa Websets MCP Server MCP server (waldzellai/exa-mcp-server-websets). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.