jules_reject_plan · Jules MCP Server MCP: Risk & Policy

WHAT IT DOES

What jules_reject_plan does on Jules MCP Server

AI agents use jules_reject_plan 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_reject_plan needs a policy

This tool modifies session state by rejecting a plan, which is a Write-category action (reversible data modification). It does not execute code, delete data irreversibly, or move money. Severity is medium because rejecting a plan could disrupt an automated workflow, but the action is reversible—the plan can potentially be resubmitted or the session restarted.

From the tool's definition The tool description states it 'Rejects the current plan for a session and optionally provides feedback.' Rejection modifies the session state by changing the plan status from pending/approved to rejected, which is a reversible state change.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jules_reject_plan Rate-limited

jules_reject_plan 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_reject_plan": {
      "limits": [
        {
          "counter": "jules_reject_plan_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_reject_plan

What does the jules_reject_plan tool do? +

Rejects the current plan for a session and optionally provides feedback. 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_reject_plan? +

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

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

Can I rate-limit jules_reject_plan? +

Yes. Add a rate_limit block to the jules_reject_plan 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_reject_plan completely? +

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

jules_reject_plan 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.