Unarchive a list. Use this tool to restore a previously archived list.
AI agents use unarchive_list 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.
Unarchiving is a Write operation as it modifies data state reversibly—the list transitions from archived to active. It is not Read (no data retrieval), not Execute (no code execution), not Destructive (the action is reversible by re-archiving), and not Financial.
From the tool's definition Tool performs 'unarchive' operation which restores/modifies the state of a previously archived list by making it active again. This is a state-changing operation that is reversible (can be re-archived).
Documented attack patterns abuse exactly the kind of access unarchive_list 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 unarchive_list:
{
"version": "1",
"default": "deny",
"tools": {
"unarchive_list": {
"limits": [
{
"counter": "unarchive_list_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unarchive_list 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.
Unarchive a list. Use this tool to restore a previously archived list. 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 unarchive_list: 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.
unarchive_list 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 unarchive_list 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 unarchive_list. 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.
unarchive_list 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.