unarchive_card

THE RISK

Medium Risk

Why unarchive_card needs a policy

This tool modifies card state by unarchiving (restoring) it. This is a Write operation because it creates or modifies data reversibly—the action can be undone by re-archiving the card. It's not Destructive because archiving is not data loss. Severity is medium because misuse could restore many cards inappropriately, causing workflow disruption, but the impact is limited to Trello board organization and reversible.

From the tool's definition Tool description states 'restore a previously archived card', which is a reversible modification operation. The action changes the state of a card from archived to active.

Documented attack patterns abuse exactly the kind of access unarchive_card gives an agent:

POLICY

How to control unarchive_card

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_card:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "unarchive_card": {
      "limits": [
        {
          "counter": "unarchive_card_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

unarchive_card 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.

Create a free account and register Trello — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Trello tools

Destructive delete_attachment Delete an attachment from a card. Use this tool to remove a file or link from a card. Destructive delete_board Permanently delete a board. Use this tool with caution as deletion cannot be undone. Destructive delete_card Permanently delete a card. Use this tool with caution as deletion cannot be undone. Destructive delete_checkitem Delete a checkitem from a checklist. Use this tool to remove an item from a checklist. Destructive delete_checklist Delete a checklist. Use this tool to remove a checklist from a card. Destructive delete_label Permanently delete a label. Use this tool with caution as deletion cannot be undone. Destructive close_board Close (archive) a board. Use this tool to archive a board without deleting it. Write remove_label Remove a label from a card. Use this tool to update the categorization of a card.

All 76 Trello tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about unarchive_card

What does the unarchive_card tool do? +

Unarchive a card. Use this tool to restore a previously archived card. 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.

How do I enforce a policy on unarchive_card? +

Register the Trello MCP server in PolicyLayer and add a rule for unarchive_card: 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.

What risk level is unarchive_card? +

unarchive_card is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit unarchive_card? +

Yes. Add a rate_limit block to the unarchive_card 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.

How do I block unarchive_card completely? +

Set action: deny in the PolicyLayer policy for unarchive_card. 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.

What MCP server provides unarchive_card? +

unarchive_card 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.

Enforce policy on every Trello tool call.

Start from Trello, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →