Create a new checkitem on a checklist. Use this tool to add a new item to a checklist.
AI agents use create_checkitem 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.
The tool creates new data (a check item) within a checklist, which is a reversible write operation. It does not execute arbitrary code, delete data irreversibly, move money, or retrieve data. The blast radius is minimal as it only adds a single item to a checklist. Severity is 'low' because creating checklist items is a low-impact, easily-reversible action with no destructive consequences.
From the tool's definition Tool name 'create_checkitem' and description states 'Create a new checkitem on a checklist' and 'add a new item to a checklist' — these are explicit create/write operations that add new data to an existing checklist in Trello.
Documented attack patterns abuse exactly the kind of access create_checkitem 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_checkitem:
{
"version": "1",
"default": "deny",
"tools": {
"create_checkitem": {
"limits": [
{
"counter": "create_checkitem_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_checkitem 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 checkitem on a checklist. Use this tool to add a new item to a checklist. 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_checkitem: 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_checkitem 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_checkitem 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_checkitem. 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_checkitem 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.