AI agents call get-webhook-item to retrieve information from Mcp Dev without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves webhook configuration data from Umbraco CMS without creating, modifying, deleting, or executing any operations. It is purely a query/read operation that returns existing webhook items. The potential blast radius is low as it only exposes existing webhook metadata without capability to trigger webhooks or alter system behavior.
From the tool's definition Tool description states 'Gets webhooks by IDs' - a retrieval operation with no side effects. The verb 'gets' and the read-only nature of querying webhook configurations indicate this is a data retrieval action.
Attacks that exploit this kind of access
Gets webhooks by IDs (or empty array if no IDs are provided). It is categorised as a Read tool in the Mcp Dev MCP Server, which means it retrieves data without modifying state.
Register the Mcp Dev MCP server in PolicyLayer and add a rule for get-webhook-item: 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 Mcp Dev. Nothing to install.
get-webhook-item is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get-webhook-item 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 get-webhook-item. 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.
get-webhook-item is provided by the Mcp Dev MCP server (@umbraco-cms/mcp-dev). 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.
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