snow_impersonate_user · Serac MCP: Risk & Policy

WHAT IT DOES

What snow_impersonate_user does on Serac

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

WHY IT NEEDS A POLICY

Why snow_impersonate_user needs a policy

An AI agent can call snow_impersonate_user faster than any human can review — one bad instruction and it creates or modifies resources in Serac by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

snow_impersonate_user Rate-limited

snow_impersonate_user 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": {
    "snow_impersonate_user": {
      "limits": [
        {
          "counter": "snow_impersonate_user_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 Serac, so you can run agents against it safely.

FAQ

Questions about snow_impersonate_user

What does the snow_impersonate_user tool do? +

Generate a ServiceNow impersonation deep-link for ACL / role debugging. Verifies the caller has the. It is categorised as a Write tool in the Serac MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on snow_impersonate_user? +

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

What risk level is snow_impersonate_user? +

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

Can I rate-limit snow_impersonate_user? +

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

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

snow_impersonate_user is provided by the Serac MCP server (serac-labs/serac). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

snow_impersonate_user is one line of Serac's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →