AI agents call search_gmail_emails to retrieve information from VaultAssist without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries Gmail messages without creating, modifying, deleting, or executing any operations. It is purely a data retrieval function. Severity is low because search operations have minimal blast radius—an AI agent misuse would expose existing data the user already has access to, not create new vulnerabilities or cause irreversible harm.
From the tool's definition Tool name 'search_gmail_emails' and description 'Search emails using Gmail query syntax' indicate a read-only query operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access search_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 search_gmail_emails:
{
"version": "1",
"default": "deny",
"tools": {
"search_gmail_emails": {}
}
}search_gmail_emails is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search emails using Gmail query syntax. It is categorised as a Read tool in the VaultAssist MCP Server, which means it retrieves data without modifying state.
Register the VaultAssist MCP server in PolicyLayer and add a rule for search_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.
search_gmail_emails 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 search_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 search_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.
search_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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79 VaultAssist tools catalogued and risk-classified — across an index of 43,000+ MCP servers.