# list_custom_fields

List custom field definitions in the workspace. Returns fields with their labels, types, and owner class info. Custom fields are created in the Huly UI on Card types, Issue types, or other classes. Use targetClass to filter fields for a specific class.

Agent View of the PolicyLayer registry record for `list_custom_fields`. HTML page: https://policylayer.com/tools/dugynoo-huly-mcp/list-custom-fields

## Facts

- Tool: `list_custom_fields`
- Server: Huly (`dugynoo/huly-mcp`) — https://policylayer.com/tools/dugynoo-huly-mcp.md
- Homepage: https://github.com/dugynoo/huly-mcp
- 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": "list_custom_fields",
    "arguments": {}
  }
}
```

## Why list_custom_fields is rated Low

This tool queries and returns metadata about custom fields without modifying, deleting, or executing any operations. It is a straightforward read operation that retrieves existing configuration data from the workspace. The use of 'List' and 'Returns' confirms data retrieval semantics. Severity is low because exposure of field definitions poses minimal risk to the system.

From the tool's own definition: "Tool name 'list_custom_fields' and description stating it 'List[s] custom field definitions' and 'Returns fields with their labels, types, and owner class info.' This is a retrieval operation with no side effects."

## Use case

AI agents call list_custom_fields to retrieve information from Huly 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 Huly:

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

## Other tools on Huly (217)

- `dedup_planner_todos` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/dedup-planner-todos.md
- `delete_attachment` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-attachment.md
- `delete_card` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-card.md
- `delete_channel` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-channel.md
- `delete_channel_message` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-channel-message.md
- `delete_comment` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-comment.md
- `delete_component` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-component.md
- `delete_dm_message` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-dm-message.md
- `delete_document` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-document.md
- `delete_event` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-event.md
- `delete_issue` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-issue.md
- `delete_issue_template` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-issue-template.md
- `delete_label` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-label.md
- `delete_milestone` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-milestone.md
- `delete_notification` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-notification.md
- `delete_organization` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-organization.md
- `delete_person` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-person.md
- `delete_project` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-project.md
- `delete_relation` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-relation.md
- `delete_tag_category` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-tag-category.md
- `delete_teamspace` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-teamspace.md
- `delete_test_case` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-case.md
- `delete_test_plan` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-plan.md
- `delete_test_result` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-result.md
- `delete_test_run` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-run.md
- `delete_test_suite` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-suite.md
- `delete_thread_reply` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-thread-reply.md
- `delete_workspace` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-workspace.md
- `remove_issue_relation` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/remove-issue-relation.md
- `remove_organization_member` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/remove-organization-member.md
- …and 187 more: https://policylayer.com/tools/dugynoo-huly-mcp.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`

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