Define a schedule (cmn_schedule) — weekly/monthly/custom recurrence and a time zone. Used downstream by SLAs, on-call shifts, and business-hours calculations. Add spans via snow_add_schedule_entry.
AI agents use snow_create_schedule 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.
This tool creates new schedule records in ServiceNow, which is a reversible write operation. While schedules can be modified or deleted later, their creation establishes persistent data that influences critical business processes (SLAs, on-call routing, business hours).
From the tool's definition "Define a schedule" — creates a new schedule record (cmn_schedule) with recurrence and timezone configuration.
Attacks that exploit this kind of access
Define a schedule (cmn_schedule) — weekly/monthly/custom recurrence and a time zone. Used downstream by SLAs, on-call shifts, and business-hours calculations. Add spans via snow_add_schedule_entry. 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.
Register the Serac MCP server in PolicyLayer and add a rule for snow_create_schedule: 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.
snow_create_schedule is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the snow_create_schedule 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.
Set action: deny in the PolicyLayer policy for snow_create_schedule. 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.
snow_create_schedule 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.
snow_create_schedule 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.
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