List all Gmail labels including both system labels (INBOX, SENT, etc.) and user-created labels. Returns label names and IDs.
AI agents call gmail_list_labels to retrieve information from Gmail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists data without side effects. It does not create, modify, delete, or execute any operations. The action is informational only, consistent with the Read category. Severity is low because disclosing available labels poses minimal risk—label names are typically user-visible metadata with no direct impact on data confidentiality or system integrity.
From the tool's definition Tool 'gmail_list_labels' returns label names and IDs with no modification, creation, or deletion capabilities. The server description states 'read-only access to your inbox.' The operation is a straightforward query that retrieves existing labels.
Attacks that exploit this kind of access
List all Gmail labels including both system labels (INBOX, SENT, etc.) and user-created labels. Returns label names and IDs. It is categorised as a Read tool in the Gmail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for gmail_list_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 Gmail MCP Server. Nothing to install.
gmail_list_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 gmail_list_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 gmail_list_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.
gmail_list_labels is provided by the Gmail MCP Server MCP server (murphy360/mcp_gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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