create_rest_message
Create a new outbound REST Message definition (requires WRITE_ENABLED=true)
This record as markdown: /tools/nowaikit-servicenow-ai-toolkit/create-rest-message.md
What create_rest_message does on NowAIKit — ServiceNow AI Toolkit
AI agents use create_rest_message 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 create_rest_message is rated Medium
This tool creates a new outbound REST message definition in ServiceNow, which is a reversible write operation. The risk is medium because creating REST message definitions could potentially be misused to exfiltrate data or trigger unauthorized integrations, but the operation is not destructive and doesn't directly move money or execute arbitrary code.
From the tool's definition Tool name 'create_rest_message' and description 'Create a new outbound REST Message definition' explicitly indicate creating a new definition.
Attacks that exploit this kind of access
The rule that runs create_rest_message 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 create_rest_message, this is the rule to start with:
create_rest_message 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 create_rest_message call is checked against it from then on.
Questions about create_rest_message
Create a new outbound REST Message definition (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 create_rest_message: 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.
create_rest_message 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 create_rest_message 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 create_rest_message. 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.
create_rest_message 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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