Send a transactional email (Sidemail API). This tools can only be used for sending transactional emails, not marketing emails (for that, use the Messenger tool).
AI agents use send-email to create or update resources in Sidemail MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sidemail MCP Server environment.
Sending email is a Write operation—it creates new data (the email record and transmission) with reversible side effects. While email sending has real-world consequences (it reaches recipients and may trigger business processes), it is not Destructive (emails aren't permanently unrecoverable by the sender) nor Financial (no money moves).
From the tool's definition Tool description states it "Send[s] a transactional email" which creates a new email message. This is a write operation that modifies email state.
Attacks that exploit this kind of access
Send a transactional email (Sidemail API). This tools can only be used for sending transactional emails, not marketing emails (for that, use the Messenger tool). It is categorised as a Write tool in the Sidemail MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sidemail MCP Server MCP server in PolicyLayer and add a rule for 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 Sidemail MCP Server. Nothing to install.
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 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 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.
send-email is provided by the Sidemail MCP Server MCP server (sidemail/sidemail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
send-email is one line of Sidemail MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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