resend_send_batch_emails · Integrations MCP: Risk & Policy

WHAT IT DOES

What resend_send_batch_emails does on Integrations MCP

AI agents use resend_send_batch_emails to create or update resources in Integrations MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Integrations MCP environment.

WHY IT NEEDS A POLICY

Why resend_send_batch_emails needs a policy

Sending emails is a write operation that creates new outbound messages and modifies system state (email queue/logs). While not destructive, this has a 'high' severity due to blast radius: an agent could spam thousands of recipients, damage reputation, violate regulations (CAN-SPAM, GDPR), or be used for phishing.

From the tool's definition Tool name 'resend_send_batch_emails' indicates sending bulk emails through the Resend email service API. The 'send' verb and 'batch' qualifier demonstrate write operations that create/dispatch email messages.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resend_send_batch_emails Rate-limited

resend_send_batch_emails stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "resend_send_batch_emails": {
      "limits": [
        {
          "counter": "resend_send_batch_emails_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Integrations MCP, so you can run agents against it safely.

FAQ

Questions about resend_send_batch_emails

What does the resend_send_batch_emails tool do? +

resend_send_batch_emails. It is categorised as a Write tool in the Integrations MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on resend_send_batch_emails? +

Register the Integrations MCP server in PolicyLayer and add a rule for resend_send_batch_emails: 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.

What risk level is resend_send_batch_emails? +

resend_send_batch_emails is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit resend_send_batch_emails? +

Yes. Add a rate_limit block to the resend_send_batch_emails 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.

How do I block resend_send_batch_emails completely? +

Set action: deny in the PolicyLayer policy for resend_send_batch_emails. 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.

What MCP server provides resend_send_batch_emails? +

resend_send_batch_emails 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.