# list_datasets

List the available hand-verified German municipal tax/fee datasets (Hundesteuer, Zweitwohnungsteuer, Pfändung), their coverage, source sites and refresh cadence. Call this first to see what you can query.

Agent View of the PolicyLayer registry record for `list_datasets`. HTML page: https://policylayer.com/tools/dev-crelvo-german-tax-data/list-datasets

## Facts

- Tool: `list_datasets`
- Server: German Tax Data (`https://data.crelvo.dev/mcp`) — https://policylayer.com/tools/dev-crelvo-german-tax-data.md
- Homepage: https://github.com/https://data.crelvo.dev/mcp
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server auth posture: open
- 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_datasets",
    "arguments": {}
  }
}
```

## Why list_datasets is rated Low

This tool retrieves and enumerates metadata about available datasets without modifying, executing, or deleting anything. It is purely informational, making it a Read category tool with low severity since the data returned is about dataset availability and source information rather than sensitive personal tax data itself.

From the tool's own definition: "Tool name is 'list_datasets' and description states 'List the available...datasets', which is a retrieval operation with no side effects. It explicitly states 'Call this first to see what you can query', indicating it is an informational/discovery tool."

## Use case

AI agents call list_datasets to retrieve information from German Tax Data 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 German Tax Data:

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

## Other tools on German Tax Data (8)

- `hundesteuer_by_state` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/hundesteuer-by-state.md
- `hundesteuer_lookup` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/hundesteuer-lookup.md
- `hundesteuer_ranking` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/hundesteuer-ranking.md
- `pfaendung_calc` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/pfaendung-calc.md
- `zweitwohnungsteuer_by_state` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-by-state.md
- `zweitwohnungsteuer_changes` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-changes.md
- `zweitwohnungsteuer_lookup` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-lookup.md
- `zweitwohnungsteuer_ranking` — Read — https://policylayer.com/tools/dev-crelvo-german-tax-data/zweitwohnungsteuer-ranking.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=dev-crelvo-german-tax-data · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-crelvo-german-tax-data