# cdc_chronic.disease.trend

Retrieve multi-year trend data for a specific chronic disease indicator at the national or state level. Returns annual values with confidence intervals so you can track how a metric changes over time (e.g. declining smoking rates, rising obesity, improving diabetes control). Filter by question ID, location (state abbreviation or "US" for national), demographic subgroup, and value type (crude prevalence, age-adjusted prevalence, rate per 100K, number). Data from ~2010 to 2023. Source: CDC CDI Socrata dataset hksd-2xuw. No auth — US Gov public domain.

Agent View of the PolicyLayer registry record for `cdc_chronic.disease.trend`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/cdc-chronic.disease.trend

## Facts

- Tool: `cdc_chronic.disease.trend`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 5
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | integer | no | Maximum number of annual data points to return (1–50, default 20). Returns most recent years first. |
| `location` | string | no | US state abbreviation (e.g. "CA", "TX", "FL") or "US" for national trend. Defaults to "US" for national-level data. |
| `question_id` | string | no | Question ID to retrieve trend data for (e.g. "TOB04" for cigarette smoking, "DIA01" for diabetes, "CVD01" for high blood pressure, "CAN01" for cancer screening) |
| `value_type_id` | string | no | Data value type to filter on. CRDPREV=Crude Prevalence (%, unadjusted), AGEADJPREV=Age-adjusted Prevalence (%, adjusted), NMBR=Number (absolute count), CRDRATE= |
| `stratification_id` | string | no | Demographic subgroup for trend. OVR=Overall, SEXF=Female, SEXM=Male, BLK=Black non-Hispanic, HIS=Hispanic, etc. Omit for all subgroups. |

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": "cdc_chronic.disease.trend",
    "arguments": {}
  }
}
```

## Why cdc_chronic.disease.trend is rated Low

Queries public CDC disease trend data with no side effects or modifications.

From the tool's own definition: "Retrieve multi-year trend data, Returns annual values, Track how a metric changes"

## Use case

AI agents call cdc_chronic.disease.trend to retrieve information from Apibase 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 Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "cdc_chronic.disease.trend": {}
  }
}
```

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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-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase