AI agents use draft_gmail_email to create or update resources in VaultAssist — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your VaultAssist environment.
This tool creates email drafts, which are reversible modifications to user data. It falls under Write rather than Execute because it does not trigger external operations (sending emails), and it is not destructive since drafts can be modified or deleted.
From the tool's definition Tool name 'draft_gmail_email' and description 'Create a draft email using Gmail API' indicate creation of email content. Drafts are reversible (can be deleted or modified before sending), and do not constitute actual message transmission.
Documented attack patterns abuse exactly the kind of access draft_gmail_email gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VaultAssist, and nothing reaches the server without passing your rules. This is the rule we recommend for draft_gmail_email:
{
"version": "1",
"default": "deny",
"tools": {
"draft_gmail_email": {
"limits": [
{
"counter": "draft_gmail_email_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}draft_gmail_email 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.
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Create a draft email using Gmail API. It is categorised as a Write tool in the VaultAssist MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the VaultAssist MCP server in PolicyLayer and add a rule for draft_gmail_email: 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 VaultAssist. Nothing to install.
draft_gmail_email 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 draft_gmail_email 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 draft_gmail_email. 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.
draft_gmail_email is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VaultAssist, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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79 VaultAssist tools catalogued and risk-classified — across an index of 43,000+ MCP servers.