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.
AI agents call preview_bulk_migration to retrieve information from TrekMail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
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
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.
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.
preview_bulk_migration is a Read tool with low risk. Read-only tools are generally safe to allow by default.
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.
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.
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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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