Fetch a Gmail thread by ID.
AI agents call get_thread to retrieve information from Google Workspace Mcp Sidecar without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/queries email thread data from Gmail. It has no side effects—it does not create, modify, delete, or execute operations. The action is a simple fetch operation, which falls squarely under the Read category. Severity is low because retrieving existing email data poses minimal risk, especially given the server's policy-enforcing design that controls visibility.
From the tool's definition Tool name 'get_thread' and description 'Fetch a Gmail thread by ID' indicate data retrieval with no modification, deletion, or execution.
Attacks that exploit this kind of access
Fetch a Gmail thread by ID. It is categorised as a Read tool in the Google Workspace Mcp Sidecar MCP Server, which means it retrieves data without modifying state.
Register the Google Workspace Mcp Sidecar MCP server in PolicyLayer and add a rule for get_thread: 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 Google Workspace Mcp Sidecar. Nothing to install.
get_thread 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 get_thread 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 get_thread. 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.
get_thread is provided by the Google Workspace Mcp Sidecar MCP server (milad/google-mcp-sidecar). 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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