update_plan_step · Melo MCP: Risk & Policy

WHAT IT DOES

What update_plan_step does on Melo

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

WHY IT NEEDS A POLICY

Why update_plan_step needs a policy

This tool creates or modifies plan metadata reversibly. It does not execute scripts, delete data, or trigger financial transactions. While it could have downstream effects if a malformed plan is created, the direct action is data modification (Write category).

From the tool's definition Tool name 'update_plan_step' and description 'Set a step' indicate modification of plan data. In the context of an agentic Roblox Studio server managing development cycles, this writes/modifies plan state rather than executing external operations or deleting…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_plan_step Rate-limited

update_plan_step 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": {
    "update_plan_step": {
      "limits": [
        {
          "counter": "update_plan_step_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 Melo, so you can run agents against it safely.

FAQ

Questions about update_plan_step

What does the update_plan_step tool do? +

Set a step. It is categorised as a Write tool in the Melo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_plan_step? +

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

What risk level is update_plan_step? +

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

Can I rate-limit update_plan_step? +

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

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

update_plan_step is provided by the Melo MCP server (yannyhl/linkedsword-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.