Send an email to multiple recipients via SendGrid. Args: to_emails: Comma-separated list of recipient email addresses. subject: Email subject. body: Email body (plain text).
AI agents invoke sendgrid_send_bulk to trigger actions in autoMate. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Sending bulk emails triggers an external operation (email delivery) that cannot be undone. It could be misused to spam or phish multiple recipients at scale. This is an Execute category action (triggering external operations) with high severity due to the bulk nature and potential for mass communication abuse.
From the tool's definition Send an email to multiple recipients via SendGrid
Documented attack patterns abuse exactly the kind of access sendgrid_send_bulk gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and autoMate, and nothing reaches the server without passing your rules. This is the rule we recommend for sendgrid_send_bulk:
{
"version": "1",
"default": "deny",
"tools": {
"sendgrid_send_bulk": {
"limits": [
{
"counter": "sendgrid_send_bulk_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}sendgrid_send_bulk stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Send an email to multiple recipients via SendGrid. Args: to_emails: Comma-separated list of recipient email addresses. subject: Email subject. body: Email body (plain text). It is categorised as a Execute tool in the autoMate MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the autoMate MCP server in PolicyLayer and add a rule for sendgrid_send_bulk: 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 autoMate. Nothing to install.
sendgrid_send_bulk is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the sendgrid_send_bulk 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 sendgrid_send_bulk. 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.
sendgrid_send_bulk is provided by the autoMate MCP server (yuruotong1/automate). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 128 autoMate tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
128 autoMate tools catalogued and risk-classified — across an index of 42,500+ MCP servers.