preview_bulk_migration

SERVERTrekMail MCP Server SOURCEtrekmail/mcp-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trekmail-mcp-server/preview-bulk-migration.md

WHAT IT DOES

What preview_bulk_migration does on TrekMail MCP Server

AI agents call preview_bulk_migration to retrieve information from TrekMail MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why preview_bulk_migration is rated Low

This tool only validates and previews migration data, returning categorized results without making any changes. It is a dry-run/read-only operation explicitly designed to be run before the actual migration starts. No data is created, modified, or deleted.

From the tool's definition 'Validate and preview a bulk migration batch. Returns categorized results showing which rows are valid, invalid, or have warnings. Always run this before start_bulk_migration.'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs preview_bulk_migration safely

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

preview_bulk_migration Allowed

preview_bulk_migration is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "preview_bulk_migration": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about preview_bulk_migration

What does the preview_bulk_migration tool do? +

Validate and preview a bulk migration batch. Returns categorized results showing which rows are valid, invalid, or have warnings. Always run this before start_bulk_migration. Requires TREKMAIL_ALLOW_MIGRATION=true. It is categorised as a Read tool in the TrekMail MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on preview_bulk_migration? +

Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for preview_bulk_migration: 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 TrekMail MCP Server. Nothing to install.

What risk level is preview_bulk_migration? +

preview_bulk_migration is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit preview_bulk_migration? +

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

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

preview_bulk_migration is provided by the TrekMail MCP Server MCP server (trekmail/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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