Create a new label on a board. Use this tool when you need to add a new label to a board for categorizing cards.
AI agents use create_label to create or update resources in Trello — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Trello environment.
Creating a label is a reversible write operation that modifies board metadata by adding a new categorization element. It has minimal blast radius—an AI agent misusing this tool might create numerous labels, but the impact is limited to board organization and easily remediated through deletion. This is clearly Write, not Execute (no code/command execution), Destructive (reversible), or Financial.
From the tool's definition Tool description states 'Create a new label on a board', which is a create operation that adds new data to Trello without deletion or financial impact.
Documented attack patterns abuse exactly the kind of access create_label gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Trello, and nothing reaches the server without passing your rules. This is the rule we recommend for create_label:
{
"version": "1",
"default": "deny",
"tools": {
"create_label": {
"limits": [
{
"counter": "create_label_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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.
Free to start. No card required.
Create a new label on a board. Use this tool when you need to add a new label to a board for categorizing cards. It is categorised as a Write tool in the Trello MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Trello MCP server in PolicyLayer and add a rule for 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 Trello. Nothing to install.
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 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 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.
create_label is provided by the Trello MCP server (v4lheru/trello-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Trello, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
76 Trello tools catalogued and risk-classified — across an index of 43,000+ MCP servers.