AI agents call get_mailbox_webhook 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 retrieves webhook configuration details by ID. It is a read-only query operation that returns data without side effects. The action is purely informational and does not create, modify, delete, or execute any operations. Severity is low because webhook configuration data, while potentially sensitive, is not executable code and does not directly impact infrastructure or financial systems when merely viewed.
From the tool's definition Tool name 'get_mailbox_webhook' and description 'Get details of a specific webhook by ID' both indicate retrieval of configuration data without modification.
Attacks that exploit this kind of access
Get details of a specific webhook by ID. 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 get_mailbox_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 Run402. Nothing to install.
get_mailbox_webhook 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_mailbox_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 get_mailbox_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.
get_mailbox_webhook 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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