move_message_to_folder

THE RISK

Medium Risk

Why move_message_to_folder needs a policy

This tool creates or modifies data reversibly by relocating messages between folders/workspaces. It does not delete data (Destructive), execute external operations (Execute), involve financial transactions (Financial), or merely retrieve data (Read).

From the tool's definition Tool description states 'Move a message to a folder by its ID' and 'Move a Message into another Folder or into a Workspace.' This modifies the organizational structure and location of messages.

Documented attack patterns abuse exactly the kind of access move_message_to_folder gives an agent:

POLICY

How to control move_message_to_folder

PolicyLayer is an MCP gateway — it sits between your AI agents and Carbon Voice, and nothing reaches the server without passing your rules. This is the rule we recommend for move_message_to_folder:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "move_message_to_folder": {
      "limits": [
        {
          "counter": "move_message_to_folder_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

move_message_to_folder 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.

Create a free account and register Carbon Voice — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Carbon Voice tools

Destructive delete_folder Delete a folder by its ID. Deleting a folder will also delete nested folders and all the m Execute run_ai_action Run an AI Action (Prompt) for a message. You can run an AI Action for a message by its ID Execute run_ai_action_for_shared_link Run an AI Action (Prompt) for a shared link. You can run an AI Action for a shared link by Write add_attachments_to_message Add attachments to a message. In order to add attachments to a message, you must provide a Write create_conversation_message Sends a message to an existing conversation or any type with a conversation_id. Write create_direct_message Send a Direct Message (DM) to a User or a Group of Users. Write create_folder Create a new folder. Write create_voicememo_message Create a VoiceMemo Message. In order to create a VoiceMemo Message, you must provide a tra

All 28 Carbon Voice tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about move_message_to_folder

What does the move_message_to_folder tool do? +

Move a message to a folder by its ID. Move a Message into another Folder or into a Workspace. It is categorised as a Write tool in the Carbon Voice MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on move_message_to_folder? +

Register the Carbon Voice MCP server in PolicyLayer and add a rule for move_message_to_folder: 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 Carbon Voice. Nothing to install.

What risk level is move_message_to_folder? +

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

Can I rate-limit move_message_to_folder? +

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

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

move_message_to_folder is provided by the Carbon Voice MCP server (phononx/cv-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Carbon Voice tool call.

Start from Carbon Voice, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →