List Gmail labels (requires OAuth2 config)
AI agents call 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 queries and retrieves Gmail label information without creating, modifying, or deleting any data. It has no side effects and returns read-only information. The requirement for OAuth2 config is an authentication mechanism, not an indication of higher risk. The 'list' operation is inherently a Read category action with minimal blast radius if misused by an agent.
From the tool's definition Tool name 'list_labels' and description 'List Gmail labels' indicates retrieval of label metadata with no modification or deletion capability.
Attacks that exploit this kind of access
List Gmail labels (requires OAuth2 config). 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 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.
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 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 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.
list_labels is provided by the Gmail MCP Server MCP server (nasirhuss86/gmail-mcp). 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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