AI agents use gmail_create_label to create or update resources in Sage MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sage MCP environment.
Creating a label is a reversible write operation that organizes existing emails but does not read sensitive data, execute external code, delete content, or move money. The blast radius of misuse is low—an attacker could create unwanted labels but could not access emails, delete messages, or cause significant harm. Reversibility via label deletion keeps this in Write rather than Execute.
From the tool's definition Tool name contains 'create' and description states 'Create a new label in the user' (presumed 'in the user's account'), indicating creation of a new organizational entity with no data destruction or irreversible side effects.
Documented attack patterns abuse exactly the kind of access gmail_create_label 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_create_label:
{
"version": "1",
"default": "deny",
"tools": {
"gmail_create_label": {
"limits": [
{
"counter": "gmail_create_label_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gmail_create_label stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create a new label in the user. It is categorised as a Write tool in the Sage MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sage MCP server in PolicyLayer and add a rule for gmail_create_label: 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_create_label 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_create_label 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_create_label. 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_create_label 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.
Free to start. No card required.
359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.