# ons.stats.population

Retrieve mid-year population estimates for the UK, England, Wales, or local authorities from the ONS. Annual estimates of usual resident population as at 30 June, by area, age group, and sex. Default returns total population for England and Wales (all ages, all sexes). Use geography parameter with ONS geography codes (K02000001=UK, K04000001=England & Wales, E92000001=England, W92000004=Wales) and age parameter for single-year-of-age breakdowns. Source: ONS mid-year population estimates, OGL v3.0.

Agent View of the PolicyLayer registry record for `ons.stats.population`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/ons.stats.population

## Facts

- Tool: `ons.stats.population`
- 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 |
| --- | --- | --- | --- |
| `age` | string | no | Age filter. Default "total" (all ages combined). Use a single year of age (e.g. "0", "25", "90") to get population for that age group only. |
| `sex` | string | no | Sex breakdown. Default "all" (total population). Options: "male", "female". |
| `geography` | string | no | ONS geography code for the area. Default "K04000001" (England and Wales). Other codes: "E92000001" (England), "W92000004" (Wales). Use the ONS geography portal |

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": "ons.stats.population",
    "arguments": {}
  }
}
```

## Why ons.stats.population is rated Low

Tool retrieves publicly available demographic statistics with no side effects or modification capabilities.

From the tool's own definition: "Retrieve mid-year population estimates for the UK, England, Wales, or local authorities"

## Use case

AI agents call ons.stats.population 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": {
    "ons.stats.population": {}
  }
}
```

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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