This record as markdown: /tools/0xka13b-microsoft-mcps/reply-to-email.md
What reply_to_email does on Microsoft MCP
AI agents use reply_to_email to create or update resources in Microsoft MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Microsoft MCP environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
body | string | Yes | Reply body |
email_id | string | Yes | Message ID to reply to |
body_type | string | — | Body content type. Defaults to text. |
Parameters from the server's own tool schema.
Why reply_to_email is rated Medium
Replying to an email creates a new outbound message, which is a reversible write/create operation. It does not delete data, execute code, or involve financial transactions. The blast radius is medium because an AI agent could send unintended or sensitive replies to external parties on the user's behalf.
From the tool's definition "Reply to an email (sender only)" — creates a new reply message directed to the original sender
Risk signalsAccepts raw HTML/template content (body)
Attacks that exploit this kind of access
The rule that runs reply_to_email safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Microsoft MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For reply_to_email, this is the rule to start with:
reply_to_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.
The button opens the PolicyLayer dashboard: create your workspace, connect Microsoft MCP, apply this rule, and every reply_to_email call is checked against it from then on.
Questions about reply_to_email
Reply to an email (sender only). It is categorised as a Write tool in the Microsoft MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
reply_to_email accepts 3 parameters: body, email_id, body_type. Required: body, email_id. The full parameter table on this page comes from the server's own tool schema.
Register the Microsoft MCP server in PolicyLayer and add a rule for reply_to_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 Microsoft MCP. Nothing to install.
reply_to_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 reply_to_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 reply_to_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.
reply_to_email is provided by the Microsoft MCP server (0xka13b/microsoft-mcps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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