AI agents use servicenow_attachment to create or update resources in Servicenow Api — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Servicenow Api environment.
Attachment operations on ServiceNow are Write-category actions because they create or add new attachments/files to records. This is reversible (attachments can be removed) and does not delete data. Severity is medium due to potential for uploading malicious files or attaching sensitive content to records unintentionally, affecting data integrity and compliance.
From the tool's definition Tool name 'servicenow_attachment' suggests file attachment operations (create, upload, associate). Description is empty, limiting certainty. ServiceNow attachment operations typically involve creating or modifying attachments linked to records.
Documented attack patterns abuse exactly the kind of access servicenow_attachment gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Servicenow Api, and nothing reaches the server without passing your rules. This is the rule we recommend for servicenow_attachment:
{
"version": "1",
"default": "deny",
"tools": {
"servicenow_attachment": {
"limits": [
{
"counter": "servicenow_attachment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}servicenow_attachment 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.
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servicenow_attachment. It is categorised as a Write tool in the Servicenow Api MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Servicenow Api MCP server in PolicyLayer and add a rule for servicenow_attachment: 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 Servicenow Api. Nothing to install.
servicenow_attachment 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 servicenow_attachment 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 servicenow_attachment. 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.
servicenow_attachment is provided by the Servicenow Api MCP server (knuckles-team/servicenow-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Servicenow Api, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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