List conversation threads, optionally filtered by query
AI agents call gmail.listThreads 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.
The tool performs a read-only operation by listing and filtering conversation threads. It has no side effects on data (no creation, modification, deletion, or external code execution). While it accesses potentially sensitive email content, the severity is low because the damage from misuse is limited to information disclosure rather than destructive or system-level impact.
From the tool's definition Tool name is 'gmail.listThreads' with description 'List conversation threads, optionally filtered by query' — this is a retrieval operation that queries and lists existing data without modification, deletion, or execution of code.
Attacks that exploit this kind of access
List conversation threads, optionally filtered by query. 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.listThreads: 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.listThreads 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.listThreads 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.listThreads. 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.listThreads is provided by the Gmail MCP Server MCP server (shcallaway/gmail-mcp-server). 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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