AI agents call list_mailbox_webhooks to retrieve information from Run402 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns existing webhook configurations. It retrieves data without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—exposure of webhook URLs or configurations could inform further attacks but does not directly enable unauthorized actions.
From the tool's definition Tool name 'list_mailbox_webhooks' with description 'List all webhooks registered on the project' indicates a read-only retrieval operation. The verb 'list' is a query operation with no side effects.
Attacks that exploit this kind of access
List all webhooks registered on the project. It is categorised as a Read tool in the Run402 MCP Server, which means it retrieves data without modifying state.
Register the Run402 MCP server in PolicyLayer and add a rule for list_mailbox_webhooks: 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 Run402. Nothing to install.
list_mailbox_webhooks 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 list_mailbox_webhooks 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 list_mailbox_webhooks. 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.
list_mailbox_webhooks is provided by the Run402 MCP server (kychee-com/run402). 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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