create_session · FOL Prover MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_session does on FOL Prover MCP Server

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

WHY IT NEEDS A POLICY

Why create_session needs a policy

This tool creates a new session, which is a reversible write operation—sessions can be deleted or cleared. It does not execute arbitrary code, delete data, move money, or cause irreversible harm. The operation is limited in scope (session metadata creation) and poses minimal risk if misused by an AI agent.

From the tool's definition Tool name 'create_session' and description 'Create a new named session for proof building' indicate creation of a new session object/record.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_session Rate-limited

create_session 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_session": {
      "limits": [
        {
          "counter": "create_session_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 FOL Prover MCP Server, so you can run agents against it safely.

FAQ

Questions about create_session

What does the create_session tool do? +

Create a new named session for proof building. It is categorised as a Write tool in the FOL Prover 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_session? +

Register the FOL Prover MCP Server MCP server in PolicyLayer and add a rule for create_session: 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 FOL Prover MCP Server. Nothing to install.

What risk level is create_session? +

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

Can I rate-limit create_session? +

Yes. Add a rate_limit block to the create_session 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_session completely? +

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

create_session is provided by the FOL Prover MCP Server MCP server (newjerseystyle/folprover-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.