Adds and/or removes specified gmail labels for a message; ensure message id and all label ids are valid (use 'listlabels' for custom label ids).
Part of the Gmail server.
Free to start. No card required.
AI agents use GMAIL_ADD_LABEL_TO_EMAIL to create or modify resources in Gmail. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call GMAIL_ADD_LABEL_TO_EMAIL repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Gmail.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"GMAIL_ADD_LABEL_TO_EMAIL": {
"limits": [
{
"counter": "gmail_add_label_to_email_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Gmail policy for all 20 tools.
These attack patterns abuse exactly the kind of access GMAIL_ADD_LABEL_TO_EMAIL gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Adds and/or removes specified gmail labels for a message; ensure message id and all label ids are valid (use 'listlabels' for custom label ids).. It is categorised as a Write tool in the Gmail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Gmail MCP server in PolicyLayer and add a rule for GMAIL_ADD_LABEL_TO_EMAIL: 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 Gmail. Nothing to install.
GMAIL_ADD_LABEL_TO_EMAIL 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 GMAIL_ADD_LABEL_TO_EMAIL 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_ADD_LABEL_TO_EMAIL. 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_ADD_LABEL_TO_EMAIL is provided by the Gmail MCP server (gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 20 Gmail tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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