# marine.ocean.waves

Hourly wave conditions forecast at an ocean coordinate — wave height (m), wave direction (°), and wave period (s) for up to 16 days. Wave height is significant wave height (average of the highest third of waves). Wave direction is the mean direction from which waves are coming (degrees clockwise from north). Wave period is the mean time between successive wave crests in seconds. Useful for surfing spot reports, ferry/vessel routing, coastal engineering assessments, and storm monitoring. Source: Open-Meteo Marine API, CC BY 4.0, no authentication required.

Agent View of the PolicyLayer registry record for `marine.ocean.waves`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/marine.ocean.waves

## Facts

- Tool: `marine.ocean.waves`
- 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 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `latitude` | number | yes | Latitude of the ocean location in decimal degrees (e.g. 51.5 for English Channel, 48.5 for Bay of Biscay). Must be over open water — land coordinates return nul |
| `timezone` | string | no | Timezone for the returned time values (e.g. "UTC", "Europe/London", "America/New_York"). Defaults to UTC. |
| `longitude` | number | yes | Longitude of the ocean location in decimal degrees (e.g. -14.0 for Atlantic, 2.3 for North Sea). |
| `forecast_days` | integer | no | Number of days to forecast (1–16). Defaults to 7. Hourly data is returned for each day. |

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": "marine.ocean.waves",
    "arguments": {
      "latitude": 0,
      "longitude": 0
    }
  }
}
```

## Why marine.ocean.waves is rated Low

Retrieves meteorological forecast data for specified coordinates; no state modification, purely informational query.

From the tool's own definition: "hourly wave conditions forecast at ocean coordinate; no side effects"

## Use case

AI agents call marine.ocean.waves 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": {
    "marine.ocean.waves": {}
  }
}
```

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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