# nasaexoplanet.planets.stats

Get discovery statistics for confirmed exoplanets aggregated by method, year, or facility. Group by "method" to see Transit vs Radial Velocity vs Imaging counts, "year" for annual discovery trends since 1988, or "facility" to rank observatories and missions (Kepler, TESS, Keck, etc.) by total discoveries (NASA Exoplanet Archive).

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

## Facts

- Tool: `nasaexoplanet.planets.stats`
- 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: 2
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | integer | no | Maximum number of groups to return (default 50, max 100) |
| `group_by` | string | no | Dimension to aggregate by: "method" (discovery method counts), "year" (annual discoveries), or "facility" (telescope/observatory counts). Default: method |

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

## Why nasaexoplanet.planets.stats is rated Low

Retrieves and aggregates public NASA exoplanet discovery statistics without side effects or data modification.

From the tool's own definition: "Get discovery statistics for confirmed exoplanets aggregated by method, year, or facility."

## Use case

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

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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