Use to create a webhook subscription. Specify an HTTPS URL and one or more event types to subscribe to. Payloads are signed with HMAC-SHA256. Write operation — requires Pro tier or higher.
AI agents use create_webhook to create or update resources in Rentalot MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rentalot MCP Server environment.
This tool creates a new webhook subscription, which is a reversible modification to system state. It does not execute code, delete data, or involve financial transactions. The medium severity reflects that misconfigured webhooks could potentially expose data to unintended endpoints or cause unwanted notifications, but the effect is limited to webhook management and the operation itself is reversible through deletion.
From the tool's definition Tool description explicitly states "Write operation" and "create a webhook subscription." The tool creates a new resource (webhook) that modifies the system's configuration by adding an event subscription.
Attacks that exploit this kind of access
Use to create a webhook subscription. Specify an HTTPS URL and one or more event types to subscribe to. Payloads are signed with HMAC-SHA256. Write operation — requires Pro tier or higher. It is categorised as a Write tool in the Rentalot MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Rentalot MCP Server MCP server in PolicyLayer and add a rule for create_webhook: 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 Rentalot MCP Server. Nothing to install.
create_webhook 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_webhook 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_webhook. 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_webhook is provided by the Rentalot MCP Server MCP server (rentalot-ai/rentalot-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →