# list_labels

List labels defined on a board.

Agent View of the PolicyLayer registry record for `list_labels`. HTML page: https://policylayer.com/tools/artemnikov-trello-mcp/list-labels

## Facts

- Tool: `list_labels`
- Server: Trello (`artemnikov/trello-mcp`) — https://policylayer.com/tools/artemnikov-trello-mcp.md
- Homepage: https://github.com/Artemnikov/Trello-mcp
- Risk category: Read (Low risk)
- Registry record: grade B, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list_labels",
    "arguments": {}
  }
}
```

## Why list_labels is rated Low

This tool queries and returns existing label definitions from a Trello board. It performs no modifications, deletions, or external actions. The operation is read-only and has minimal security impact even if misused by an AI agent, as it only exposes metadata about board labels already known to users with board access.

From the tool's own definition: "Tool name 'list_labels' and description 'List labels defined on a board' indicate a retrieval operation with no side effects."

## Use case

AI agents call list_labels to retrieve information from Trello without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Trello:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_labels": {}
  }
}
```

## Other tools on Trello (15)

- `get_card` — Read — https://policylayer.com/tools/artemnikov-trello-mcp/get-card.md
- `list_board_members` — Read — https://policylayer.com/tools/artemnikov-trello-mcp/list-board-members.md
- `list_boards` — Read — https://policylayer.com/tools/artemnikov-trello-mcp/list-boards.md
- `list_cards` — Read — https://policylayer.com/tools/artemnikov-trello-mcp/list-cards.md
- `list_lists` — Read — https://policylayer.com/tools/artemnikov-trello-mcp/list-lists.md
- `add_checklist` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/add-checklist.md
- `add_checklist_item` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/add-checklist-item.md
- `add_comment` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/add-comment.md
- `add_label` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/add-label.md
- `archive_card` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/archive-card.md
- `assign_member` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/assign-member.md
- `create_card` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/create-card.md
- `move_card` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/move-card.md
- `set_check_item` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/set-check-item.md
- `update_card` — Write — https://policylayer.com/tools/artemnikov-trello-mcp/update-card.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=artemnikov-trello-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/artemnikov-trello-mcp