List all sending domains configured in Resend.
AI agents call resend_list_domains to retrieve information from Integrations MCP 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 domain configuration data from Resend (an email service provider). It performs a read-only operation that retrieves information without creating, modifying, deleting, or executing any actions. The blast radius of misuse is minimal — an AI agent could only view domain configurations, which typically contains non-sensitive metadata about which domains are authorized for sending.
From the tool's definition Tool name contains 'list' and description states 'List all sending domains configured in Resend' — a pure retrieval operation with no data modification or side effects.
Attacks that exploit this kind of access
List all sending domains configured in Resend. It is categorised as a Read tool in the Integrations MCP MCP Server, which means it retrieves data without modifying state.
Register the Integrations MCP server in PolicyLayer and add a rule for resend_list_domains: 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 Integrations MCP. Nothing to install.
resend_list_domains 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 resend_list_domains 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 resend_list_domains. 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.
resend_list_domains is provided by the Integrations MCP server (shriram-vasudevan/integrations-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.
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