# usda_nass_crop_history

Return bounded final annual USDA NASS national history for one major-crop metric from the self-hosted 2020–2026 annual-summary releases. Includes values, units, crop class, source release file, pagination, evidence hash, and attribution. Use this for 'US corn yield from 2019 to 2025', 'soybean production history', or 'winter wheat acres harvested'. Available crop years are 2019–2025; this is not a forecast or state/county result.

Agent View of the PolicyLayer registry record for `usda_nass_crop_history`. HTML page: https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/usda-nass-crop-history

## Facts

- Tool: `usda_nass_crop_history`
- Server: Livedatalink (`https://livedatalink.ai/mcp`) — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink.md
- Homepage: https://github.com/blackboxfoundry/livedatalink
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: no
- Parameters: 8 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `crop` | string | yes | Crop name or supported alias: corn, soybeans, cotton, wheat, winter wheat, durum wheat, or spring wheat. |
| `limit` | integer | no | Maximum crop years. Default 20. |
| `metric` | string | yes | Annual statistic to return. |
| `offset` | integer | no | Crop years to skip. Default 0. |
| `end_year` | integer | no | Four-digit crop year. Hosted snapshot coverage is 2019–2025. |
| `crop_class` | string | no | Optional class. Required for bare 'wheat': winter, durum, or spring (excluding durum). |
| `start_year` | integer | no | Four-digit crop year. Hosted snapshot coverage is 2019–2025. |
| `response_format` | string | no | Human-readable markdown or machine-readable JSON. Default markdown. |

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": "usda_nass_crop_history",
    "arguments": {
      "crop": "<crop>",
      "metric": "<metric>"
    }
  }
}
```

## Why usda_nass_crop_history is rated Low

Even though usda_nass_crop_history 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 usda_nass_crop_history to retrieve information from Livedatalink 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 Livedatalink:

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

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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`

---

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