# nasaexoplanet.planets.search

Search NASA Exoplanet Archive for confirmed exoplanets by name, host star, discovery method, year range, radius, or mass. Returns orbital period, radius, mass, equilibrium temperature, discovery year and facility, and system distance. 6,298+ confirmed planets from Transit, Radial Velocity, Imaging, and Microlensing surveys (NASA Exoplanet Archive).

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

## Facts

- Tool: `nasaexoplanet.planets.search`
- 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: 10
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | integer | no | Maximum number of results to return (default 20, max 100) |
| `mass_max` | number | no | Maximum planet mass in Earth masses (e.g. 318 ≈ 1 Jupiter mass) |
| `mass_min` | number | no | Minimum planet mass in Earth masses (e.g. 0.1 for sub-Earths) |
| `host_name` | string | no | Host star name or partial name (e.g. "51 Peg", "Kepler-442") |
| `radius_max` | number | no | Maximum planet radius in Earth radii (e.g. 2.0 for super-Earths; 11 ≈ Jupiter) |
| `radius_min` | number | no | Minimum planet radius in Earth radii (e.g. 0.5 for sub-Earths and above) |
| `planet_name` | string | no | Planet name or partial name to search (e.g. "Kepler-22 b", "TOI-700") |
| `disc_year_max` | integer | no | Maximum discovery year (e.g. 2020 to filter planets found before 2021) |
| `disc_year_min` | integer | no | Minimum discovery year (e.g. 2010 to filter planets found in 2010 or later) |
| `discovery_method` | string | no | Discovery method filter (e.g. "Transit", "Radial Velocity", "Imaging") |

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

## Why nasaexoplanet.planets.search is rated Low

Retrieves public astronomical data without side effects or mutation capabilities.

From the tool's own definition: "Search NASA Exoplanet Archive for confirmed exoplanets; returns orbital period, radius, mass, equilibrium temperature, discovery year, facility, system distance."

Risk signals: High parameter count (10 properties)

## Use case

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

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- `polymarket.trading.cancel_order` — Destructive — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/polymarket.trading.cancel-order.md
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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