Add a label to a Gmail message. Common labels: STARRED (star), IMPORTANT, INBOX. Use listGmailLabels to see all available labels. WARNING: Draft message IDs are ephemeral and may change after draft modifications (e.g., adding/removing attachments). If labeling a draft, perform label operations BE...
AI agents use addGmailLabel to create or update resources in Google Workspace MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Google Workspace MCP Server environment.
The tool modifies Gmail message state by applying labels, which is a standard write operation. It does not delete, execute code, move money, or trigger external processes. The warning about draft message IDs is an implementation detail that does not change the fundamental nature of the operation. Severity is low because mislabeling messages has minimal blast radius and is easily reversible via removing the label.
From the tool's definition Tool name 'addGmailLabel' and description states it 'Add[s] a label to a Gmail message', which is a reversible modification of message metadata. Labels can be removed, making this a non-destructive write operation.
Attacks that exploit this kind of access
Add a label to a Gmail message. Common labels: STARRED (star), IMPORTANT, INBOX. Use listGmailLabels to see all available labels. WARNING: Draft message IDs are ephemeral and may change after draft modifications (e.g., adding/removing attachments). If labeling a draft, perform label operations BEFORE modifying draft attachments, or re-fetch the draft to get the current message ID. It is categorised as a Write tool in the Google Workspace MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for addGmailLabel: 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.
addGmailLabel is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the addGmailLabel 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 addGmailLabel. 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.
addGmailLabel 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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