# list_news_types

List all available market news type codes for filtering.

Agent View of the PolicyLayer registry record for `list_news_types`. HTML page: https://policylayer.com/tools/6551team-opennews-mcp/list-news-types

## Facts

- Tool: `list_news_types`
- Server: OpenNews MCP (`6551team/opennews-mcp`) — https://policylayer.com/tools/6551team-opennews-mcp.md
- Homepage: https://github.com/6551Team/opennews-mcp
- Risk category: Read (Low risk)
- Registry record: grade A, 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_news_types",
    "arguments": {}
  }
}
```

## Why list_news_types is rated Low

Even though list_news_types only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

## Use case

AI agents call list_news_types to retrieve information from OpenNews MCP 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 OpenNews MCP:

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

## Other tools on OpenNews MCP (18)

- `subscribe_latest_news` — Other — https://policylayer.com/tools/6551team-opennews-mcp/subscribe-latest-news.md
- `get_company_info` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-company-info.md
- `get_company_report_text` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-company-report-text.md
- `get_crypto_holding_changes` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-crypto-holding-changes.md
- `get_crypto_holdings` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-crypto-holdings.md
- `get_high_score_news` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-high-score-news.md
- `get_hot_news` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-hot-news.md
- `get_key_market_events` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-key-market-events.md
- `get_latest_news` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-latest-news.md
- `get_news_by_engine` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-news-by-engine.md
- `get_news_by_signal` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-news-by-signal.md
- `get_news_by_source` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-news-by-source.md
- `get_news_categories` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-news-categories.md
- `get_news_sources` — Read — https://policylayer.com/tools/6551team-opennews-mcp/get-news-sources.md
- `search_companies` — Read — https://policylayer.com/tools/6551team-opennews-mcp/search-companies.md
- `search_news` — Read — https://policylayer.com/tools/6551team-opennews-mcp/search-news.md
- `search_news_advanced` — Read — https://policylayer.com/tools/6551team-opennews-mcp/search-news-advanced.md
- `search_news_by_coin` — Read — https://policylayer.com/tools/6551team-opennews-mcp/search-news-by-coin.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=6551team-opennews-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/6551team-opennews-mcp