reorder_blocks · Pl MCP: Risk & Policy

WHAT IT DOES

What reorder_blocks does on Pl

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

WHY IT NEEDS A POLICY

Why reorder_blocks needs a policy

This tool modifies the arrangement/ordering of blocks within a project. It is a reversible write operation (reordering can be undone by reordering again), not destructive since no data is deleted. Misuse could disrupt project structure but data remains intact.

From the tool's definition Reorder blocks in a project. Must provide ALL block IDs in the desired order.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reorder_blocks Rate-limited

reorder_blocks 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": {
    "reorder_blocks": {
      "limits": [
        {
          "counter": "reorder_blocks_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 Pl, so you can run agents against it safely.

FAQ

Questions about reorder_blocks

What does the reorder_blocks tool do? +

Reorder blocks in a project. Must provide ALL block IDs in the desired order. It is categorised as a Write tool in the Pl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on reorder_blocks? +

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

What risk level is reorder_blocks? +

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

Can I rate-limit reorder_blocks? +

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

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

reorder_blocks is provided by the Pl MCP server (@milaboratories/pl-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.