snow_delete_attachment
Permanently delete a file attachment by its sys_id via the /api/now/attachment endpoint. Removes the file from its parent record.
This record as markdown: /tools/serac/snow-delete-attachment.md
What snow_delete_attachment does on Serac
AI agents call snow_delete_attachment to permanently remove resources in Serac, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why snow_delete_attachment is rated Critical
This tool irreversibly deletes data (file attachments) from ServiceNow records. Once deleted via sys_id, the attachment cannot be recovered through normal means. While scoped to individual attachments rather than bulk destructive operations, the permanent nature and irreversibility warrant the Destructive category over Write.
From the tool's definition Tool name explicitly includes 'delete'; description states 'Permanently delete a file attachment' and 'Removes the file from its parent record.' The use of 'Permanently' and the irreversible nature of deletion clearly establish this as destructive.
Attacks that exploit this kind of access
The rule that runs snow_delete_attachment 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_delete_attachment, this is the rule to start with:
snow_delete_attachment is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Serac, apply this rule, and every snow_delete_attachment call is checked against it from then on.
Questions about snow_delete_attachment
Permanently delete a file attachment by its sys_id via the /api/now/attachment endpoint. Removes the file from its parent record. It is categorised as a Destructive tool in the Serac MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Serac MCP server in PolicyLayer and add a rule for snow_delete_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 Serac. Nothing to install.
snow_delete_attachment is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the snow_delete_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 snow_delete_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.
snow_delete_attachment 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.
More on Serac, and thousands of servers like it.
Across the catalogue