# ea-hydrology.stations.search

Search the UK Environment Agency hydrology monitoring network for river, groundwater, and rainfall stations, filterable by river name, freetext label search, or what the station measures (waterFlow, waterLevel, rainfall, temperature, groundwaterLevel). Returns station_id, name, river/catchment, coordinates, and measure count — use the station_id with ea-hydrology.station_measures to see its available data series. Data: environment.data.gov.uk/hydrology, UK Open Government Licence v3.0, no auth required.

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

## Facts

- Tool: `ea-hydrology.stations.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: 4
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | integer | no | Max stations to return (default 20, max 200). |
| `search` | string | no | Freetext search matching the station label/name (e.g. "Farmoor"). |
| `river_name` | string | no | Filter stations by river name, partial match (e.g. "River Thames"). |
| `observed_property` | string | no | Filter stations by what they measure: waterFlow (river flow m3/s), waterLevel (river level), rainfall, temperature, or groundwaterLevel (borehole). |

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": "ea-hydrology.stations.search",
    "arguments": {}
  }
}
```

## Why ea-hydrology.stations.search is rated Low

Retrieves public hydrology station metadata and coordinates with no side effects or data modification.

From the tool's own definition: "Search the UK Environment Agency hydrology monitoring network for river, groundwater, and rainfall stations"

## Use case

AI agents call ea-hydrology.stations.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": {
    "ea-hydrology.stations.search": {}
  }
}
```

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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