Read a specific Gmail message by ID. Returns full message content including headers, body, and attachments info.
AI agents call readGmailMessage to retrieve information from Google Workspace MCP Server 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 existing Gmail message data. It performs a read-only operation that does not create, modify, delete, or execute any actions. The worst-case misuse would be unauthorized access to message contents, which is a confidentiality concern but not a destructive or operational risk.
From the tool's definition Tool name 'readGmailMessage' and description 'Read a specific Gmail message by ID. Returns full message content including headers, body, and attachments info' clearly indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Read a specific Gmail message by ID. Returns full message content including headers, body, and attachments info. It is categorised as a Read tool in the Google Workspace MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for readGmailMessage: 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 Server. Nothing to install.
readGmailMessage 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 readGmailMessage 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 readGmailMessage. 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.
readGmailMessage is provided by the Google Workspace MCP Server MCP server (pm990320/google-workspace-mcp). 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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