AI agents use snow_create_atf_test_step 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 data (test steps) in a ServiceNow table, which is a reversible write operation. It does not delete data (Destructive), execute arbitrary scripts (Execute), move money (Financial), or merely read (Read).
From the tool's definition The tool 'Adds a test step to an existing ATF test' via the 'sys_atf_step table' – this creates new records in ServiceNow's Automated Test Framework without deleting or executing arbitrary code.
Attacks that exploit this kind of access
Adds a test step to an existing ATF test. Steps define the actions and assertions for testing using the sys_atf_step table. 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_atf_test_step: 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_atf_test_step 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_atf_test_step 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_atf_test_step. 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_atf_test_step 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_atf_test_step 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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