Move emails to Archive folder using UIDs for long-term storage. UIDs are permanent identifiers.
AI agents use archive_emails to create or update resources in Yahoo Mail — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Yahoo Mail environment.
Archiving is a write operation that modifies email state/location reversibly. While it changes data organization, it does not delete or destroy data (which would be Destructive), nor does it execute arbitrary code (Execute). The severity is medium because misuse could hide important emails from the inbox, disrupting workflow, but the action is fully reversible through unarchiving or moving emails back to the inbox.
From the tool's definition Tool description states 'Move emails to Archive folder' — this is a reversible modification operation. The emails remain accessible in the Archive folder and can be moved back.
Documented attack patterns abuse exactly the kind of access archive_emails gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Yahoo Mail, and nothing reaches the server without passing your rules. This is the rule we recommend for archive_emails:
{
"version": "1",
"default": "deny",
"tools": {
"archive_emails": {
"limits": [
{
"counter": "archive_emails_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}archive_emails 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.
Free to start. No card required.
Move emails to Archive folder using UIDs for long-term storage. UIDs are permanent identifiers. It is categorised as a Write tool in the Yahoo Mail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Yahoo Mail MCP server in PolicyLayer and add a rule for archive_emails: 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 Yahoo Mail. Nothing to install.
archive_emails 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 archive_emails 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 archive_emails. 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.
archive_emails is provided by the Yahoo Mail MCP server (jtokib/yahoo-mail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Yahoo Mail, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
11 Yahoo Mail tools catalogued and risk-classified — across an index of 43,000+ MCP servers.