update_transformation · Zhook MCP: Risk & Policy

WHAT IT DOES

What update_transformation does on Zhook

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

WHY IT NEEDS A POLICY

Why update_transformation needs a policy

This tool modifies existing transformation configurations but does not delete or destroy data (which would be Destructive), nor does it execute arbitrary code (which would be Execute). The modification is reversible—transformations can be updated again or reverted.

From the tool's definition Tool name is 'update_transformation' and description states 'Update an existing transformation.' The verb 'update' indicates modification of existing data in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_transformation Rate-limited

update_transformation 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_transformation": {
      "limits": [
        {
          "counter": "update_transformation_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 Zhook, so you can run agents against it safely.

FAQ

Questions about update_transformation

What does the update_transformation tool do? +

Update an existing transformation. It is categorised as a Write tool in the Zhook 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_transformation? +

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

What risk level is update_transformation? +

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

Can I rate-limit update_transformation? +

Yes. Add a rate_limit block to the update_transformation 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_transformation completely? +

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

update_transformation is provided by the Zhook MCP server (zhookteam/zhook-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.