AI agents use rename-label to create or update resources in Enhanced Gmail MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Enhanced Gmail MCP Server environment.
Renaming a label is a write operation that modifies existing Gmail configuration but does not delete data or trigger financial transactions. The change is reversible (can be renamed again), so it is Write rather than Destructive. While it affects Gmail organization, the blast radius is limited to label metadata changes, justifying medium severity rather than high.
From the tool's definition Tool description states it "Renames an existing label", which modifies metadata of an existing Gmail label. This is a reversible change operation.
Documented attack patterns abuse exactly the kind of access rename-label gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Enhanced Gmail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for rename-label:
{
"version": "1",
"default": "deny",
"tools": {
"rename-label": {
"limits": [
{
"counter": "rename-label_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}rename-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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Renames an existing label. It is categorised as a Write tool in the Enhanced Gmail MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Enhanced Gmail MCP Server MCP server in PolicyLayer and add a rule for rename-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 Enhanced Gmail MCP Server. Nothing to install.
rename-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 rename-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 rename-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.
rename-label is provided by the Enhanced Gmail MCP Server MCP server (theposch/gmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Enhanced Gmail MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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27 Enhanced Gmail MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.