AI agents call gmail_get_thread to retrieve information from Sage MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries an existing email thread without creating, modifying, or deleting any data. It is a read-only operation that returns information about messages. The severity is low because exposure allows an attacker to read email content if they can guess or obtain valid thread IDs, but does not enable data modification or financial harm directly.
From the tool's definition Tool name contains 'get' and description states 'Get a specific email thread by ID with all messages' — a retrieval operation with no modification or deletion.
Documented attack patterns abuse exactly the kind of access gmail_get_thread gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for gmail_get_thread:
{
"version": "1",
"default": "deny",
"tools": {
"gmail_get_thread": {}
}
}gmail_get_thread is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a specific email thread by ID with all messages. It is categorised as a Read tool in the Sage MCP MCP Server, which means it retrieves data without modifying state.
Register the Sage MCP server in PolicyLayer and add a rule for gmail_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 Sage MCP. Nothing to install.
gmail_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 gmail_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 gmail_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.
gmail_get_thread is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.