Extract unique email addresses from messages matching a Gmail query. Useful for building contact lists.
AI agents call extract_addresses 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 only queries and extracts data from existing emails without creating, modifying, deleting, or executing operations. It fits the Read category: 'retrieves or queries data; no side effects.' Severity is low because extracting contact information poses minimal risk even if misused by an agent; the worst outcome is exposure of email addresses already contained in accessible messages.
From the tool's definition The tool 'extract_addresses' extracts email addresses from matching messages—a retrieval operation with no modification. The description states it is 'Useful for building contact lists,' indicating a read-only aggregation task. No side effects mentioned.
Attacks that exploit this kind of access
Extract unique email addresses from messages matching a Gmail query. Useful for building contact lists. 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 extract_addresses: 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.
extract_addresses 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 extract_addresses 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 extract_addresses. 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.
extract_addresses is provided by the Gmail MCP Server MCP server (neutral-stage/gmail-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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