update-script

Updates a script by path

SERVERMcp Dev SOURCE@umbraco-cms/mcp-dev

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-dev/update-script.md

WHAT IT DOES

What update-script does on Mcp Dev

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

RISK

Why update-script is rated Medium

The tool modifies (not deletes) script files, placing it in Write category. Severity is high because updating scripts in a CMS can have broad runtime consequences—malicious script changes could compromise site functionality, inject malicious code, or alter business logic. However, it is reversible (scripts can be updated again), so it does not reach Destructive or Execute severity.

From the tool's definition Tool name 'update-script' and description 'Updates a script by path' indicate modification of script files, which are executable code artifacts in a CMS environment.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update-script safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Dev, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update-script, this is the rule to start with:

update-script Rate-limited

update-script 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-script": {
      "limits": [
        {
          "counter": "update-script_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Dev, apply this rule, and every update-script call is checked against it from then on.

FAQ

Questions about update-script

What does the update-script tool do? +

Updates a script by path. It is categorised as a Write tool in the Mcp Dev 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-script? +

Register the Mcp Dev MCP server in PolicyLayer and add a rule for update-script: 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 Mcp Dev. Nothing to install.

What risk level is update-script? +

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

Can I rate-limit update-script? +

Yes. Add a rate_limit block to the update-script 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-script completely? +

Set action: deny in the PolicyLayer policy for update-script. 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-script? +

update-script is provided by the Mcp Dev MCP server (@umbraco-cms/mcp-dev). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Mcp Dev, and thousands of servers like it.

This server

All 419 Mcp Dev tools →

Across the catalogue

aroflo_create_or_update_record on AroFlo MCP →team_manager_update_budget on Team Manager MCP → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →