指定したmessageIdのメール本文と詳細を取得します。 引数: messageId (GmailのメッセージID)
AI agents call gmail_get_message to retrieve information from Mcp Gmail Gas without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns Gmail message content without modifying, deleting, or executing any operations. It is a straightforward read operation that retrieves existing data from a Gmail account. The severity is low because while it accesses user email content, the impact is limited to information disclosure without side effects or destructive capability.
From the tool's definition Tool description states it 'retrieves' (取得します) email body and details for a specified messageId. The function name 'gmail_get_message' and lack of modification language indicate data retrieval only.
Documented attack patterns abuse exactly the kind of access gmail_get_message gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Gmail Gas, and nothing reaches the server without passing your rules. This is the rule we recommend for gmail_get_message:
{
"version": "1",
"default": "deny",
"tools": {
"gmail_get_message": {}
}
}gmail_get_message is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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指定したmessageIdのメール本文と詳細を取得します。 引数: messageId (GmailのメッセージID). It is categorised as a Read tool in the Mcp Gmail Gas MCP Server, which means it retrieves data without modifying state.
Register the Mcp Gmail Gas MCP server in PolicyLayer and add a rule for gmail_get_message: 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 Mcp Gmail Gas. Nothing to install.
gmail_get_message 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_message 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_message. 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_message is provided by the Mcp Gmail Gas MCP server (kazuph/mcp-gmail-gas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Gmail Gas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
3 Mcp Gmail Gas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.