# lookup_identifier

根据不同标识类型搜索证券信息

Agent View of the PolicyLayer registry record for `lookup_identifier`. HTML page: https://policylayer.com/tools/16coffee-finance-mcp/lookup-identifier

## Facts

- Tool: `lookup_identifier`
- Server: Yahoo Finance MCP Server (`16coffee/finance-mcp`) — https://policylayer.com/tools/16coffee-finance-mcp.md
- Homepage: https://github.com/16Coffee/finance-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": "lookup_identifier",
    "arguments": {}
  }
}
```

## Why lookup_identifier is rated Low

This is a lookup/search function that queries financial data based on identifiers (ticker symbols, CUSIPs, etc.). It retrieves information without side effects, matching the Read category. The blast radius is minimal as the tool only returns existing data. Given the Yahoo Finance MCP context providing 'detailed stock information,' this is clearly a read-only data retrieval tool.

From the tool's own definition: "Tool name 'lookup_identifier' and description 'search securities information by different identifier types' indicate a data retrieval operation with no modification, creation, deletion, or execution capabilities."

## Use case

AI agents call lookup_identifier to retrieve information from Yahoo Finance MCP Server 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 Yahoo Finance MCP Server:

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

## Other tools on Yahoo Finance MCP Server (33)

- `get_all_crypto_quotes` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-all-crypto-quotes.md
- `get_analyst_estimates` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-analyst-estimates.md
- `get_calendar_data` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-calendar-data.md
- `get_crypto_intraday` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-intraday.md
- `get_crypto_latest_news` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-latest-news.md
- `get_crypto_list` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-list.md
- `get_crypto_news` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-news.md
- `get_crypto_price_eod` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-price-eod.md
- `get_crypto_quote` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-quote.md
- `get_crypto_quote_short` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-crypto-quote-short.md
- `get_dcf_valuation` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-dcf-valuation.md
- `get_directory_list` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-directory-list.md
- `get_economic_data` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-economic-data.md
- `get_executive_info` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-executive-info.md
- `get_financial_statement` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-financial-statement.md
- `get_historical_stock_prices` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-historical-stock-prices.md
- `get_ma_data` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-ma-data.md
- `get_news_sentiment` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-news-sentiment.md
- `get_option_chain` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-option-chain.md
- `get_option_expiration_dates` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-option-expiration-dates.md
- `get_price_target_info` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-price-target-info.md
- `get_ratings` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-ratings.md
- `get_shares_float_info` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-shares-float-info.md
- `get_stock_actions` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-actions.md
- `get_stock_grade_latest_news` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-grade-latest-news.md
- `get_stock_grade_news` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-grade-news.md
- `get_stock_grades` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-grades.md
- `get_stock_grades_historical` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-grades-historical.md
- `get_stock_grades_summary` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-grades-summary.md
- `get_stock_info` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-stock-info.md
- …and 3 more: https://policylayer.com/tools/16coffee-finance-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`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=16coffee-finance-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/16coffee-finance-mcp