# nasaexoplanet.planets.habitable

Find potentially habitable exoplanets in the conservative habitable zone — planets with Earth-like radius (0.5–2.0 R⊕) and equilibrium temperature suitable for liquid water (180–310 K). Sorted by radius ascending. Returns radius, mass, orbital period, equilibrium temperature, insolation flux, and host star details. Customisable temperature and radius bounds for optimistic or strict filtering (NASA Exoplanet Archive — pscomppars table).

Agent View of the PolicyLayer registry record for `nasaexoplanet.planets.habitable`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/nasaexoplanet.planets.habitable

## Facts

- Tool: `nasaexoplanet.planets.habitable`
- 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 candidates to return (default 20, max 100) |
| `temp_max` | number | no | Maximum equilibrium temperature in Kelvin (default 310 — conservative habitable zone upper bound) |
| `temp_min` | number | no | Minimum equilibrium temperature in Kelvin (default 180 — conservative habitable zone lower bound) |
| `radius_max` | number | no | Maximum planet radius in Earth radii (default 2.0 — upper limit for rocky planets) |
| `radius_min` | number | no | Minimum planet radius in Earth radii (default 0.5 — filters sub-Earth bodies) |

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": "nasaexoplanet.planets.habitable",
    "arguments": {}
  }
}
```

## Why nasaexoplanet.planets.habitable is rated Low

Tool retrieves NASA exoplanet data with no side effects, modifications, or external operations.

From the tool's own definition: "Find potentially habitable exoplanets, returns radius, mass, orbital period, temperature."

## Use case

AI agents call nasaexoplanet.planets.habitable 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": {
    "nasaexoplanet.planets.habitable": {}
  }
}
```

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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