usda_nass_crop_trend
Calculate prior-year and exact five-year changes for one final annual USDA NASS national crop series. Returns component observations, absolute and percent changes, five-year CAGR when valid, exact units, evidence hash, and caveats. Use this for 'how has corn yield changed?', 'five-year soybean pr...
This record as markdown: /tools/io-github-blackboxfoundry-livedatalink/usda-nass-crop-trend.md
What usda_nass_crop_trend does on Livedatalink
AI agents call usda_nass_crop_trend 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.
| Parameter | Type | Required | Description |
|---|---|---|---|
crop | string | Yes | Crop name or supported alias: corn, soybeans, cotton, wheat, winter wheat, durum wheat, or spring wheat. |
metric | string | Yes | Annual statistic to return. |
as_of_year | integer | — | Four-digit crop year. Hosted snapshot coverage is 2019–2025. |
crop_class | string | — | Optional class. Required for bare 'wheat': winter, durum, or spring (excluding durum). |
response_format | string | — | Human-readable markdown or machine-readable JSON. Default markdown. |
Parameters from the server's own tool schema.
Why usda_nass_crop_trend is rated Low
Even though usda_nass_crop_trend 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.
Attacks that exploit this kind of access
The rule that runs usda_nass_crop_trend safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Livedatalink, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For usda_nass_crop_trend, this is the rule to start with:
usda_nass_crop_trend is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Livedatalink, apply this rule, and every usda_nass_crop_trend call is checked against it from then on.
Questions about usda_nass_crop_trend
Calculate prior-year and exact five-year changes for one final annual USDA NASS national crop series. Returns component observations, absolute and percent changes, five-year CAGR when valid, exact units, evidence hash, and caveats. Use this for 'how has corn yield changed?', 'five-year soybean production trend', or 'trend in upland cotton planted acres'. The optional as-of year never mixes future releases into a historical result. It is categorised as a Read tool in the Livedatalink MCP Server, which means it retrieves data without modifying state.
usda_nass_crop_trend accepts 5 parameters: crop, metric, as_of_year, crop_class, response_format. Required: crop, metric. The full parameter table on this page comes from the server's own tool schema.
Register the Livedatalink MCP server in PolicyLayer and add a rule for usda_nass_crop_trend: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Livedatalink. Nothing to install.
usda_nass_crop_trend is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the usda_nass_crop_trend rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for usda_nass_crop_trend. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
usda_nass_crop_trend is provided by the Livedatalink MCP server (https://livedatalink.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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