# get_board_custom_fields Get all custom field definitions on a board. Returns field IDs, names, and types. Agent View of the PolicyLayer registry record for `get_board_custom_fields`. HTML page: https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-board-custom-fields ## Facts - Tool: `get_board_custom_fields` - Server: Trello (`@delorenj/mcp-server-trello`) — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello.md - Install: `npx -y @delorenj/mcp-server-trello` - Homepage: https://github.com/delorenj/mcp-server-trello - Risk category: Read (Low risk) - Registry record: grade F, 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": "get_board_custom_fields", "arguments": {} } } ``` ## Why get_board_custom_fields is rated Low This tool queries and retrieves metadata about custom field definitions on a Trello board. It performs a read-only operation that fetches information without modifying, deleting, or executing any operations. The low severity reflects that exposure of field metadata poses minimal risk, as it does not enable data manipulation, deletion, or financial operations. From the tool's own definition: "Tool name contains 'get_' prefix and description states it 'Returns field IDs, names, and types' - a retrieval operation with no side effects or modifications." ## Use case AI agents call get_board_custom_fields 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": { "get_board_custom_fields": {} } } ``` ## Other tools on Trello (49) - `archive_list` — Destructive — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/archive-list.md - `delete_checklist_item` — Destructive — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/delete-checklist-item.md - `delete_comment` — Destructive — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/delete-comment.md - `delete_label` — Destructive — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/delete-label.md - `download_attachment` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/download-attachment.md - `find_checklist_items_by_description` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/find-checklist-items-by-description.md - `get_acceptance_criteria` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-acceptance-criteria.md - `get_active_board_info` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-active-board-info.md - `get_board_labels` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-board-labels.md - `get_board_members` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-board-members.md - `get_card` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-card.md - `get_card_comments` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-card-comments.md - `get_card_history` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-card-history.md - `get_cards_by_list_id` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-cards-by-list-id.md - `get_checklist_by_name` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-checklist-by-name.md - `get_checklist_items` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-checklist-items.md - `get_lists` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-lists.md - `get_my_cards` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-my-cards.md - `get_recent_activity` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/get-recent-activity.md - `list_boards` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/list-boards.md - `list_boards_in_workspace` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/list-boards-in-workspace.md - `list_workspaces` — Read — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/list-workspaces.md - `add_card_to_list` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/add-card-to-list.md - `add_cards_to_list` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/add-cards-to-list.md - `add_checklist_item` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/add-checklist-item.md - `add_comment` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/add-comment.md - `add_list_to_board` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/add-list-to-board.md - `archive_card` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/archive-card.md - `assign_member_to_card` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/assign-member-to-card.md - `attach_data_to_card` — Write — https://policylayer.com/tools/io-github-delorenj-mcp-server-trello/attach-data-to-card.md - …and 19 more: https://policylayer.com/tools/io-github-delorenj-mcp-server-trello.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=io-github-delorenj-mcp-server-trello · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-delorenj-mcp-server-trello