# unhabitat.urban.open_spaces

Retrieve the share of urban built-up area allocated to open public spaces (parks, plazas) and streets (SDG indicator 11.7.1). Covers 621 cities as of the 2020 measurement year. Returns percentage of open public space, street space, and combined open-and-street share, plus the population count with access to open public space. Filter by country, city, or UN region. Useful for green space equity, climate resilience, and liveability analysis.

Agent View of the PolicyLayer registry record for `unhabitat.urban.open_spaces`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/unhabitat.urban.open-spaces

## Facts

- Tool: `unhabitat.urban.open_spaces`
- 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: 4
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `city` | string | no | Filter by city name (partial match, e.g. "Nairobi", "Lagos", "Mumbai"). Case-insensitive. |
| `limit` | integer | no | Maximum number of cities to return (1–100, default 50). |
| `region` | string | no | Filter by UN-Habitat region (partial match). Regions include "Sub-Saharan Africa", "Northern America and Europe", "Eastern and South-Eastern Asia", "Central and |
| `country` | string | no | Filter by country name (partial match, e.g. "Kenya", "United States", "Brazil"). Case-insensitive. |

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": "unhabitat.urban.open_spaces",
    "arguments": {}
  }
}
```

## Why unhabitat.urban.open_spaces is rated Low

Retrieves urban sustainability data with no side effects or write capabilities.

From the tool's own definition: "Retrieve the share of urban built-up area allocated to open public spaces"

## Use case

AI agents call unhabitat.urban.open_spaces 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": {
    "unhabitat.urban.open_spaces": {}
  }
}
```

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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