add_clause · Prolog MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_clause does on Prolog MCP Server

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

WHY IT NEEDS A POLICY

Why add_clause needs a policy

An AI agent can call add_clause faster than any human can review — one bad instruction and it creates or modifies resources in Prolog MCP Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_clause Rate-limited

add_clause 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_clause": {
      "limits": [
        {
          "counter": "add_clause_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 Prolog MCP Server, so you can run agents against it safely.

FAQ

Questions about add_clause

What does the add_clause tool do? +

Add a Prolog clause to the server. A clause should solely exist of a single valid Prolog rule or Prolog fact, to be used for following Prolog queries. It is categorised as a Write tool in the Prolog 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_clause? +

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

What risk level is add_clause? +

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

Can I rate-limit add_clause? +

Yes. Add a rate_limit block to the add_clause 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_clause completely? +

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

add_clause is provided by the Prolog MCP Server MCP server (wendelinism/prolog-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.