# yahoo_finance_ticker_history

Yahoo Finance historical prices. Returns normalized OHLCV points for a symbol. Use either period or start/end.

Agent View of the PolicyLayer registry record for `yahoo_finance_ticker_history`. HTML page: https://policylayer.com/tools/crawlora-mcp/yahoo-finance-ticker-history

## Facts

- Tool: `yahoo_finance_ticker_history`
- Server: Crawlora (`crawlora-mcp`) — https://policylayer.com/tools/crawlora-mcp.md
- Install: `npx -y crawlora-mcp`
- Homepage: https://www.npmjs.com/package/crawlora-mcp
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 11 (1 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `end` | string | no | Unix seconds, RFC3339, or YYYY-MM-DD |
| `start` | string | no | Unix seconds, RFC3339, or YYYY-MM-DD |
| `keepna` | boolean | no | Keep fully empty chart rows |
| `period` | string | no | Range such as 1d, 1mo, 1y, max |
| `symbol` | string | yes | Yahoo Finance symbol such as AAPL |
| `interval` | string | no | Interval such as 1d, 1h, 5m |
| `rounding` | boolean | no | Round prices to two decimals |
| `auto_adjust` | boolean | no | Adjust OHLC prices with adjusted close |
| `back_adjust` | boolean | no | Back-adjust OHLC prices while keeping close |
| `include_actions` | boolean | no | Include dividends, splits, and capital gains |
| `include_prepost` | boolean | no | Include pre/post market data |

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": "yahoo_finance_ticker_history",
    "arguments": {
      "symbol": "<symbol>"
    }
  }
}
```

## Why yahoo_finance_ticker_history is rated High

yahoo_finance_ticker_history triggers real processes with real consequences. An agent gone sideways doesn't fire it once. It starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Risk signals: High parameter count (11 properties)

## Use case

AI agents invoke yahoo_finance_ticker_history to trigger actions in Crawlora. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Crawlora:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "yahoo_finance_ticker_history": {
      "limits": [
        {
          "counter": "yahoo_finance_ticker_history_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

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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`

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