# data-europa.reference.theme_list

List the 14 fixed DCAT-AP data themes used by the EU Open Data Portal (e.g. "ENVI" for Environment, "HEAL" for Health, "ECON" for Economy and finance) with localized labels. Use the returned theme code as the theme filter for data-europa.dataset_search. Data: data.europa.eu Hub-Search API, no auth required.

Agent View of the PolicyLayer registry record for `data-europa.reference.theme_list`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/data-europa.reference.theme-list

## Facts

- Tool: `data-europa.reference.theme_list`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 1
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `locale` | string | no | 2-letter language code for theme labels (default "en") |

Parameters from the server's own tool schema.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "data-europa.reference.theme_list",
    "arguments": {}
  }
}
```

## Why data-europa.reference.theme_list is rated Low

Tool retrieves and lists fixed reference data with no side effects or modifications possible.

From the tool's own definition: "List the 14 fixed DCAT-AP data themes with localized labels."

## Use case

AI agents call data-europa.reference.theme_list to retrieve information from Apibase 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 Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "data-europa.reference.theme_list": {}
  }
}
```

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## 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-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase