upload_attachment
Upload a base64-encoded attachment to a ServiceNow record (requires WRITE_ENABLED=true).
This record as markdown: /tools/nowaikit-servicenow-ai-toolkit/upload-attachment.md
What upload_attachment does on NowAIKit — ServiceNow AI Toolkit
AI agents use upload_attachment to create or update resources in NowAIKit — ServiceNow AI Toolkit, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your NowAIKit — ServiceNow AI Toolkit environment.
Why upload_attachment is rated Medium
This tool creates or modifies data by attaching files to ServiceNow records. While attachments can technically be deleted, the primary action is additive and reversible (attachment removal). It does not execute code, destroy data, or move money.
From the tool's definition Tool description states 'Upload a base64-encoded attachment to a ServiceNow record' with requirement 'WRITE_ENABLED=true'. The term 'upload' and explicit WRITE_ENABLED flag indicate this creates/adds data to existing records.
Attacks that exploit this kind of access
The rule that runs upload_attachment safely
PolicyLayer is an MCP gateway: it sits between your AI agents and NowAIKit — ServiceNow AI Toolkit, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For upload_attachment, this is the rule to start with:
upload_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.
The button opens the PolicyLayer dashboard: create your workspace, connect NowAIKit — ServiceNow AI Toolkit, apply this rule, and every upload_attachment call is checked against it from then on.
Questions about upload_attachment
Upload a base64-encoded attachment to a ServiceNow record (requires WRITE_ENABLED=true). It is categorised as a Write tool in the NowAIKit — ServiceNow AI Toolkit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the NowAIKit — ServiceNow AI Toolkit MCP server in PolicyLayer and add a rule for upload_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 NowAIKit — ServiceNow AI Toolkit. Nothing to install.
upload_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 upload_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 upload_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.
upload_attachment is provided by the NowAIKit — ServiceNow AI Toolkit MCP server (nowaikit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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