snow_create_flow_action

Create custom IntegrationHub action for Flow Designer

SERVERSerac SOURCEserac-labs/serac

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/serac/snow-create-flow-action.md

WHAT IT DOES

What snow_create_flow_action does on Serac

AI agents use snow_create_flow_action 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.

RISK

Why snow_create_flow_action is rated Medium

This tool creates a custom action within ServiceNow's Flow Designer (IntegrationHub), which is a write operation that modifies the platform configuration. While reversible (can be deleted), it has high severity because flow actions can be integrated into production workflows and automations. Misuse could create unauthorized integrations or actions that execute unintended business logic.

From the tool's definition Tool name 'snow_create_flow_action' and description 'Create custom IntegrationHub action for Flow Designer' indicate creation of a new flow action in ServiceNow—a reversible data creation operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs snow_create_flow_action safely

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

snow_create_flow_action Rate-limited

snow_create_flow_action 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_create_flow_action": {
      "limits": [
        {
          "counter": "snow_create_flow_action_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 Serac, apply this rule, and every snow_create_flow_action call is checked against it from then on.

FAQ

Questions about snow_create_flow_action

What does the snow_create_flow_action tool do? +

Create custom IntegrationHub action for Flow Designer. 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_create_flow_action? +

Register the Serac MCP server in PolicyLayer and add a rule for snow_create_flow_action: 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_create_flow_action? +

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

Can I rate-limit snow_create_flow_action? +

Yes. Add a rate_limit block to the snow_create_flow_action 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_create_flow_action completely? +

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

snow_create_flow_action 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.

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