# Stellarhound — stargazing forecasts, dark-sky sites & aurora

> Live stargazing forecasts: per-night sky scores, dark-sky sites, aurora & light pollution anywhere.

- name: com.stellarhound/stellarhound-mcp
- version: 0.1.0
- connection class: R0 (autonomous)
- trust: 79/100 flags: no-repository
- quality: 85/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.stellarhound%2Fstellarhound-mcp
- tools: https://api.protogrid.dev/v1/servers/com.stellarhound%2Fstellarhound-mcp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "stellarhound-mcp": {
      "type": "http",
      "url": "https://stellarhound.com/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 99
- freshness: 85
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-97% ~updated-62d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 85/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 5 of 5 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: get_stargazing_conditions (idempotentHint); get_aurora_forecast (idempotentHint); get_light_pollution (idempotentHint); …
- pass `tools.token_cost`: about 1,340 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 5, about 1,340 tokens to load them all
- tool set hash: 27c3d672165e858f387548ce4bc0556b
- badge: [![protogrid quality](https://protogrid.dev/badge/com.stellarhound/stellarhound-mcp.svg)](https://protogrid.dev/servers/com.stellarhound/stellarhound-mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://stellarhound.com/mcp (streamable-http, auth none, reachable true, uptime30d 0.9745763)

## Packages

_none_

## Tools (5)

- `find_dark_sky_sites`: Recommend dark-sky sites near a location, ranked by whether the drive is worth it.

    Use for "where should I drive to stargaze near X". Sites are grouped by
    drivability (how far), then ranked by a drive-worth score combining the
    best weather window over the next 7 nights, how much darker the site is
    than the user's location, and drive time. Drive times are approximate
    (straight-line x 1.3), not routed.

    Args:
        lat: Latitude in decimal degrees (-90..90).
        lon: Longitude in decimal degrees (-180..180).
        limit: Max sites to return, 1-12 (default 5).

    Returns {ranking (methodology note), tiers:[{tier, label, hint, sites:[...]}],
    nearest_km, uncertainty_note, attribution} — sites grouped into drivability
    tiers. Include the methodology note when presenting — it explains the
    ordering honestly.
    
- `get_aurora_forecast`: Get the aurora (northern/southern lights) outlook for a location.

    Use for "any chance of aurora tonight near X". Combines the Kp-index
    forecast with the location's geomagnetic latitude to say whether aurora
    could be visible there, and when.

    Args:
        lat: Latitude in decimal degrees (-90..90).
        lon: Longitude in decimal degrees (-180..180).

    Returns {kp_forecast:[{time, kp, flag: observed|estimated|predicted}, ...],
    visibility assessment fields, attribution}. Kp entries are flagged by how
    firm they are — keep those labels when presenting.
    
- `get_light_pollution`: Estimate light pollution at any point: approximate Bortle class and what's visible there.

    Use for "how dark is the sky at X" / "can I see the Milky Way from X".
    Returns the zenith-brightness-derived estimate (mpsas, approximate Bortle
    class) and a plain-language ceiling: what the Milky Way, naked-eye and
    telescope views are like under that sky. This is a satellite-data estimate,
    not a field measurement — say so.

    Args:
        lat: Latitude in decimal degrees (-90..90).
        lon: Longitude in decimal degrees (-180..180).

    Returns {light_pollution:{bortle_approx, mpsas, ceiling:{label, milky_way,
    naked_eye, telescope}, note}, attribution}.
    
- `get_stargazing_conditions`: Score the next nights for stargazing at a location (0-100 per night).

    Use for "when should I stargaze this week near X", "is Saturday any good
    for the Milky Way", trip planning. Each night combines the three-layer
    cloud-cover forecast, moon illumination and up-fraction, and the
    astronomical-darkness window; `best_window` names the best upcoming night.
    Also returns the location's light-pollution estimate (approximate Bortle
    class + what's visible at that darkness).

    Args:
        lat: Latitude in decimal degrees (-90..90). You know city coordinates — pass them.
        lon: Longitude in decimal degrees (-180..180).
        nights: How many nights ahead to score, 1-16 (default 7; forecasts
            beyond ~7 nights are increasingly uncertain).

    Returns {timezone, light_pollution, nights:[{date, darkness, moon, cloud,
    score:{value, band, summary}}], best_window, uncertainty_note, attribution}.
    Present scores/verdicts verbatim; skies beyond ~7 days are provisional.
    
- `get_tonight_agenda`: Get tonight's stargazing plan for a location: score, darkness window, and what to observe.

    Use when the user asks "what can I see tonight" / "is tonight worth going
    out". Returns tonight's sky score and darkness window plus a ranked agenda
    of observing targets appropriate for the location's sky darkness.

    Args:
        lat: Latitude in decimal degrees (-90..90).
        lon: Longitude in decimal degrees (-180..180).

    Returns {timezone, light_pollution, tonight:{date, darkness, weather,...},
    targets/agenda entries, attribution}. Report as returned.