AI agents use update_gmail_label 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.
Updating a Gmail label is a reversible modification operation (Write category). It does not delete data (Destructive), execute code (Execute), or involve financial transactions (Financial). Severity is medium because misuse could reorganize or obscure email organization across multiple messages, affecting user workflow and potentially hiding important communications, though the action is reversible.
From the tool's definition Tool name 'update_gmail_label' and description 'Update an existing Gmail label' indicate modification of Gmail label configuration. This is a write operation that modifies metadata reversibly.
Documented attack patterns abuse exactly the kind of access update_gmail_label 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 update_gmail_label:
{
"version": "1",
"default": "deny",
"tools": {
"update_gmail_label": {
"limits": [
{
"counter": "update_gmail_label_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_gmail_label 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.
Update an existing Gmail label. 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 update_gmail_label: 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.
update_gmail_label 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 update_gmail_label 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 update_gmail_label. 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.
update_gmail_label 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.
Free to start. No card required.
79 VaultAssist tools catalogued and risk-classified — across an index of 43,000+ MCP servers.