reply_to_message

Reply to a message; recipients, subject and threading are set automatically.

SERVERAgenticEmail SOURCEhttps://api.agenticemail.dev/mcp

Medium RISK CLASS

Category Write

Parameters 33 required

Recommended Rate-limitedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/dev-agenticemail-mcp/reply-to-message.md

WHAT IT DOES

What reply_to_message does on AgenticEmail

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

Parameter	Type	Required
`text`	string	Yes
`inbox_id`	string	Yes
`message_id`	string	Yes

Parameters from the server's own tool schema.

RISK

Why reply_to_message is rated Medium

This tool creates new email messages and sends them, which constitutes data modification. It is not destructive (messages can be deleted), not financial, and not arbitrary code execution.

From the tool's definition Tool description states 'Reply to a message' which creates and sends a new message. The action of composing and sending a reply modifies email state by adding a new message to a thread, which is reversible (the message can be deleted or recalled depending on…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs reply_to_message safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AgenticEmail, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For reply_to_message, this is the rule to start with:

reply_to_message Rate-limited

reply_to_message 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": {
    "reply_to_message": {
      "limits": [
        {
          "counter": "reply_to_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AgenticEmail, apply this rule, and every reply_to_message call is checked against it from then on.

FAQ

Questions about reply_to_message

What does the reply_to_message tool do? +

Reply to a message; recipients, subject and threading are set automatically. It is categorised as a Write tool in the AgenticEmail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does reply_to_message accept? +

reply_to_message accepts 3 parameters: text, inbox_id, message_id. Required: text, inbox_id, message_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on reply_to_message? +

Register the AgenticEmail MCP server in PolicyLayer and add a rule for reply_to_message: 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 AgenticEmail. Nothing to install.

What risk level is reply_to_message? +

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

Can I rate-limit reply_to_message? +

Yes. Add a rate_limit block to the reply_to_message 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 reply_to_message completely? +

Set action: deny in the PolicyLayer policy for reply_to_message. 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 reply_to_message? +

reply_to_message is provided by the AgenticEmail MCP server (https://api.agenticemail.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on AgenticEmail, and thousands of servers like it.

This server

All 9 AgenticEmail tools →

Across the catalogue

reply-to-email on Meme MCP Server → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →