jules_create_session · Jules MCP Server MCP: Risk & Policy

WHAT IT DOES

What jules_create_session does on Jules MCP Server

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

WHY IT NEEDS A POLICY

Why jules_create_session needs a policy

This tool creates a new session resource, which is a reversible write operation. It initializes a coding task session but does not by itself execute code, delete data, or move money. Severity is medium because creating sessions could trigger downstream AI coding operations that interact with repositories.

From the tool's definition Creates a new Jules session to perform an asynchronous coding task

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jules_create_session Rate-limited

jules_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": {
    "jules_create_session": {
      "limits": [
        {
          "counter": "jules_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 Jules MCP Server, so you can run agents against it safely.

FAQ

Questions about jules_create_session

What does the jules_create_session tool do? +

Creates a new Jules session to perform an asynchronous coding task. It is categorised as a Write tool in the Jules 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 jules_create_session? +

Register the Jules MCP Server MCP server in PolicyLayer and add a rule for jules_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 Jules MCP Server. Nothing to install.

What risk level is jules_create_session? +

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

Can I rate-limit jules_create_session? +

Yes. Add a rate_limit block to the jules_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 jules_create_session completely? +

Set action: deny in the PolicyLayer policy for jules_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 jules_create_session? +

jules_create_session is provided by the Jules MCP Server MCP server (streetquant/jules-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.