AI agents use liara_send_email to create or update resources in Liara MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Liara MCP Server environment.
Sending an email creates a new message and commits it to delivery, which is a reversible write operation. It is not Financial (no money moves), not Destructive (the email can theoretically be recalled or marked as spam), and not Execute (it doesn't run arbitrary code, though it could be abused to spam).
From the tool's definition Tool name is 'liara_send_email' with description 'Send an email via a mail server'. The action creates/sends a new email message, which is a write operation that modifies state (adds a message to a mailbox/queue).
Documented attack patterns abuse exactly the kind of access liara_send_email gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Liara MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for liara_send_email:
{
"version": "1",
"default": "deny",
"tools": {
"liara_send_email": {
"limits": [
{
"counter": "liara_send_email_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}liara_send_email 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.
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Send an email via a mail server. It is categorised as a Write tool in the Liara MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Liara MCP Server MCP server in PolicyLayer and add a rule for liara_send_email: 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 Liara MCP Server. Nothing to install.
liara_send_email is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the liara_send_email 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 liara_send_email. 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.
liara_send_email is provided by the Liara MCP Server MCP server (razavioo/liara-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Liara MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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108 Liara MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.