# delphi.covid.covidcast

Access COVID-19 epidemiological signals from multiple data sources via CMU Delphi COVIDcast. Sources include: "jhu-csse" (JHU confirmed cases/deaths), "hhs" (HHS hospitalization admissions), "fb-survey" (COVID symptom surveys), "doctor-visits" (CLI doctor visits), and more. Signals can be filtered by geographic level (nation, state, county, MSA, HHS region) and date range. Returns signal value, standard error, sample size, and reporting lag. No auth — CMU Delphi open COVID surveillance data, unlimited free.

Agent View of the PolicyLayer registry record for `delphi.covid.covidcast`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/delphi.covid.covidcast

## Facts

- Tool: `delphi.covid.covidcast`
- 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: 6 (4 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `signal` | string | yes | Signal name within the data source. Examples for jhu-csse: "confirmed_cumulative_num", "confirmed_incidence_num", "deaths_cumulative_num", "deaths_incidence_num |
| `geo_type` | string | no | Geographic aggregation level (default: "state"). "nation"=US, "state"=US state, "county"=county FIPS, "msa"=metro area, "hrr"=hospital referral region, "hhs"=HH |
| `geo_value` | string | yes | Geographic identifier. For state: 2-letter code (e.g. "ca", "ny"). For county: 5-digit FIPS (e.g. "06037"). For nation: "us". For hrr: HRR number. Case-insensit |
| `time_type` | string | no | Temporal resolution: "day" (daily, default) or "week" (weekly epiweek). |
| `data_source` | string | yes | Signal data source. Common values: "jhu-csse" (JHU confirmed cases/deaths), "cdc" (CDC surveillance), "hhs" (HHS hospitalization), "fb-survey" (COVID symptoms s |
| `time_values` | string | yes | Date(s) in YYYYMMDD format. Single: "20210101". Range: "20210101-20210131". Supports up to ~200 dates per call. |

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": "delphi.covid.covidcast",
    "arguments": {
      "signal": "<signal>",
      "geo_value": "<geo_value>",
      "data_source": "<data_source>",
      "time_values": "<time_values>"
    }
  }
}
```

## Why delphi.covid.covidcast is rated Low

Tool retrieves public epidemiological data with no side effects, modifications, or destructive operations.

From the tool's own definition: "Access COVID-19 epidemiological signals from multiple data sources via CMU Delphi COVIDcast"

## Use case

AI agents call delphi.covid.covidcast 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": {
    "delphi.covid.covidcast": {}
  }
}
```

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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