v0.1.0 to v0.1.0

---

name: wetter

version: 0.1.0

type: expert

author: ellmos

created: 2026-06-22

updated: 2026-06-22

description: Answers weather questions for a location or coordinates via wttr.in (free, no API key). Current weather + 3-day forecast. Location comes from the user request or preferences; optional short cache.

standalone: true

anthropic_compatible: true

bach_compatible: false

bach_origin: true

category: assist

tags: [wetter, wttr, vorschau, assist]

language: de

status: active

dependencies: {'tools': ['wetter_core.py'], 'services': [], 'protocols': [], 'python': ['urllib', 'json']}

provenance: {'origin': 'bach', 'origin_path': 'system/hub/_services/weather/weather_service.py', 'origin_version': '1.0', 'origin_repo': 'github.com/ellmos-ai/bach', 'origin_license': 'MIT', 'last_sync_from_origin': '2026-06-22', 'last_sync_to_origin': None, 'local_changes_since_sync': True}

---

> **Deutsch** — Offizielle Deutsch-Version / Documento Oficial en Deutsch.

# Weather (Deutsch)

Fast, key-free weather information for everyday use.

## Übersicht & Zweck

Answers "What will the weather be like?" questions without an API key (data source: wttr.in).

Delivers current weather (temperature, feels-like, wind, humidity, UV) plus a

compact 3-day forecast. **User-neutral:** no fixed location in the code — the location

comes from the request or from `assist/prefs.json` (`wetter_default_location`),

which the LLM fills in interactively with the user.

## Triggers

| User input | Action |

|---|---|

| "Weather for Potsdam?" / "What will the weather be like in Hamburg?" | `wetter_core.py "<location>"` |

| "Weather tomorrow?" (without location) | `wetter_core.py --default` (location from prefs) |

| "My default weather location is Potsdam" | `wetter_core.py --set-default "Potsdam"` |

| Coordinates known | `wetter_core.py <lat> <lon>` |

## Workflow & Vorgehen

```

1. Determine location: from request; else prefs.json (wetter_default_location);

else ask user interactively + optionally save as default.

2. Query wetter_core.py (wttr.in, 2 attempts, 30-min cache).

3. Present readable weather text + 3-day forecast.

```

## CLI Entry Point (wetter_core.py)

```bash

python wetter_core.py "Potsdam" # location

python wetter_core.py 52.6789 13.5878 # coordinates

python wetter_core.py --default # location from prefs.json

python wetter_core.py --set-default "Potsdam"

```

## Store (optional)

- **No mandatory store.** Optional short cache `assist/wetter/.cache.json`

(TTL 30 min, best-effort) — avoids repeated network calls.

- Location preference in `assist/prefs.json` (`wetter_default_location`).

## Attitude

We use wttr.in as the key-free default source, but are open to other weather

backends (e.g. DWD/OpenWeather) if the user prefers them.

## Privacy

- Only the location name/coordinates go to wttr.in (required for the query).

- No telemetry, no account. Cache + preference stay local.

## Related Resources

- `assist/AGENTS.md` — Umbrella router

- `assist/reiseroute/` — uses weather for travel planning (planned)

## Änderungsprotokoll

### 0.1.0 (2026-06-22)

- Initial version. Ported from BACH `hub/_services/weather/weather_service.py` (MIT).

- Extended: location name support (not just coordinates), 3-day forecast,

optional cache, prefs-based default location. User-neutral.