# cdc_chronic.disease.state_compare

Compare a chronic disease indicator across all US states for a given year. Returns the value for each state (prevalence %, rate, or count) plus the 5 highest and 5 lowest states for quick ranking. Requires a question_id (e.g. "DIA01" for diabetes prevalence, "TOB04" for smoking, "CVD01" for high blood pressure). Optional year (default most recent 2023) and demographic stratification. Useful for geographic health disparity analysis and policy research. Source: CDC CDI Socrata dataset hksd-2xuw. No auth — US Gov public domain.

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

## Facts

- Tool: `cdc_chronic.disease.state_compare`
- 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: 3
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `year` | integer | no | Data year for comparison (e.g. 2023). Defaults to most recent available year (2023 or later). All states return the same year for a fair comparison. |
| `question_id` | string | no | Question ID to compare across states (e.g. "DIA01" for diabetes prevalence, "TOB04" for smoking, "CVD01" for high blood pressure, "AST01" for asthma prevalence) |
| `stratification_id` | string | no | Demographic subgroup to compare. OVR=Overall (default, all adults), SEXF=Female, SEXM=Male, WHT=White non-Hispanic, BLK=Black non-Hispanic, HIS=Hispanic, AGE65P |

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.state_compare",
    "arguments": {}
  }
}
```

## Why cdc_chronic.disease.state_compare is rated Low

Tool retrieves and compares public CDC chronic disease data across states with no side effects.

From the tool's own definition: "Compare indicator across states, returns value for each state, no modification or deletion"

## Use case

AI agents call cdc_chronic.disease.state_compare 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.state_compare": {}
  }
}
```

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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