# get_option_chain

Fetch the option chain for a given ticker symbol, expiration date, and option type.

Agent View of the PolicyLayer registry record for `get_option_chain`. HTML page: https://policylayer.com/tools/16coffee-finance-mcp/get-option-chain

## Facts

- Tool: `get_option_chain`
- 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": "get_option_chain",
    "arguments": {}
  }
}
```

## Why get_option_chain is rated Low

This tool queries and retrieves existing financial market data (option chains) without creating, modifying, deleting, executing code, or moving money. It is a passive data retrieval operation with no side effects. The low severity reflects minimal risk—misuse would only result in information disclosure, not financial transactions or system harm.

From the tool's own definition: "Tool name 'get_option_chain' and description 'Fetch the option chain' indicate data retrieval with no modification. Verb 'Fetch' is a read operation. Returns market data (option chain) for analysis purposes only."

## Use case

AI agents call get_option_chain 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": {
    "get_option_chain": {}
  }
}
```

## 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_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
- `get_top_gainers` — Read — https://policylayer.com/tools/16coffee-finance-mcp/get-top-gainers.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`

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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