rucio_approve_rule · Rucio MCP: Risk & Policy

WHAT IT DOES

What rucio_approve_rule does on Rucio

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

WHY IT NEEDS A POLICY

Why rucio_approve_rule needs a policy

This tool changes the state of a replication rule by approving it, which affects data replication policies. This is a Write operation because it modifies data/configuration state reversibly—the approval can theoretically be revoked or the rule adjusted. It is not Destructive (rule remains intact), not Financial (no monetary implications), not Execute (no arbitrary code execution), and not Read (has side effects).

From the tool's definition Tool description states 'Approve a replication rule that is waiting for approval.' This modifies the state of a replication rule from pending/waiting to approved, which is a reversible state change in a data management system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

rucio_approve_rule Rate-limited

rucio_approve_rule 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": {
    "rucio_approve_rule": {
      "limits": [
        {
          "counter": "rucio_approve_rule_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 Rucio, so you can run agents against it safely.

FAQ

Questions about rucio_approve_rule

What does the rucio_approve_rule tool do? +

Approve a replication rule that is waiting for approval. It is categorised as a Write tool in the Rucio MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on rucio_approve_rule? +

Register the Rucio MCP server in PolicyLayer and add a rule for rucio_approve_rule: 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 Rucio. Nothing to install.

What risk level is rucio_approve_rule? +

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

Can I rate-limit rucio_approve_rule? +

Yes. Add a rate_limit block to the rucio_approve_rule 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 rucio_approve_rule completely? +

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

rucio_approve_rule is provided by the Rucio MCP server (kratsg/rucio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.