replication_update

THE RISK

Medium Risk

Why replication_update needs a policy

This tool modifies an existing replication task configuration, which could alter backup/recovery schedules, target destinations, or data transfer parameters. While reversible (hence Write rather than Destructive), misconfiguration could redirect backups to wrong locations, skip critical data, or interfere with disaster recovery capabilities.

From the tool's definition Tool name 'replication_update' and description 'Update an existing replication task' indicate modification of a replication configuration. Replication tasks manage data synchronization/backup operations in TrueNAS SCALE.

Documented attack patterns abuse exactly the kind of access replication_update gives an agent:

POLICY

How to control replication_update

PolicyLayer is an MCP gateway — it sits between your AI agents and Truenas, and nothing reaches the server without passing your rules. This is the rule we recommend for replication_update:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "replication_update": {
      "limits": [
        {
          "counter": "replication_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

replication_update 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.

Create a free account and register Truenas — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about replication_update

What does the replication_update tool do? +

Update an existing replication task. It is categorised as a Write tool in the Truenas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on replication_update? +

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

What risk level is replication_update? +

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

Can I rate-limit replication_update? +

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

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

replication_update is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Truenas tool call.

Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →