AI agents use batch_modify_gmail_emails 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 modifies Gmail emails in bulk without permanently deleting them. While it affects user data and could be misused by an AI agent to tamper with email content, the modifications are reversible. The 'batch' nature amplifies impact, warranting 'high' severity due to potential for modifying many emails simultaneously, but it remains Write rather than Destructive since the data is not irrevocably lost.
From the tool's definition Tool name 'batch_modify_gmail_emails' and description 'Modify multiple emails at once' indicate the tool creates or modifies data reversibly. The 'batch_' prefix and the sibling tool 'batch_delete_gmail_emails' confirm this operates on multiple items.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access batch_modify_gmail_emails 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 batch_modify_gmail_emails:
{
"version": "1",
"default": "deny",
"tools": {
"batch_modify_gmail_emails": {
"limits": [
{
"counter": "batch_modify_gmail_emails_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}batch_modify_gmail_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.
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Modify multiple emails at once. 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 batch_modify_gmail_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 VaultAssist. Nothing to install.
batch_modify_gmail_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 batch_modify_gmail_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 batch_modify_gmail_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.
batch_modify_gmail_emails 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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