jules_send_message · Jules MCP Server MCP: Risk & Policy

WHAT IT DOES

What jules_send_message does on Jules MCP Server

AI agents use jules_send_message 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_send_message needs a policy

This tool sends a message to an existing session, which is a write operation. It creates/posts new data (a message) to an active session. While it could potentially trigger AI actions depending on the message content, the primary action described is sending a message, not executing code or commands directly.

From the tool's definition Sends a message to an active Jules session

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jules_send_message Rate-limited

jules_send_message 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_send_message": {
      "limits": [
        {
          "counter": "jules_send_message_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_send_message

What does the jules_send_message tool do? +

Sends a message to an active Jules session. 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_send_message? +

Register the Jules MCP Server MCP server in PolicyLayer and add a rule for jules_send_message: 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_send_message? +

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

Can I rate-limit jules_send_message? +

Yes. Add a rate_limit block to the jules_send_message 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_send_message completely? +

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

jules_send_message 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.

// THE FULL RECORD

jules_send_message is one line of Jules MCP Server's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →