This record as markdown: /tools/3xcaffeine-mcp-server/list-gmail-labels.md
What list_gmail_labels does on VaultAssist
AI agents call list_gmail_labels to retrieve information from VaultAssist without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why list_gmail_labels is rated Low
This tool performs a simple query/list operation on Gmail labels, returning information with no side effects. It does not create, modify, delete, or execute operations. The blast radius is minimal—an AI agent misusing this tool could only observe label structure, not compromise user data or accounts. Classification as Read is appropriate.
From the tool's definition Tool name 'list_gmail_labels' and description 'List all Gmail labels' indicate a read-only operation that retrieves label metadata without modifying, deleting, or executing any actions.
Attacks that exploit this kind of access
The rule that runs list_gmail_labels safely
PolicyLayer is an MCP gateway: it sits between your AI agents and VaultAssist, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_gmail_labels, this is the rule to start with:
list_gmail_labels is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect VaultAssist, apply this rule, and every list_gmail_labels call is checked against it from then on.
Questions about list_gmail_labels
List all Gmail labels. 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 list_gmail_labels: 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.
list_gmail_labels 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 list_gmail_labels 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 list_gmail_labels. 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.
list_gmail_labels 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.
More on VaultAssist, and thousands of servers like it.
This server
Across the catalogue