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Magnus Hedemark
0f38fd56a7
Adds a new Phase 4 section to the cli-builder skill that teaches how to wrap a CLI tool in an agentskills.io-compliant SKILL.md wrapper, creating the two-layer architecture: CLI as execution engine + skill as trigger surface. Includes a complete worked example (weather-cli) with frontmatter conventions, essential commands, gotchas, and auth wiring documentation. Signed-off-by: Jasper <magnus@groktop.us>
109 lines
3.8 KiB
Markdown
109 lines
3.8 KiB
Markdown
# Skill Wrapper Example — `weather-cli`
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A complete worked example of an agent-skills-compliant wrapper around a hypothetical weather API CLI. This follows the Phase 4 pattern: the SKILL.md triggers discovery, the CLI binary provides execution.
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## Directory Structure
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```
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weather-cli/
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├── weather-cli # CLI binary (built with Phases 1-3)
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└── SKILL.md # Skill wrapper (Phase 4)
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```
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## `SKILL.md`
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```yaml
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---
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name: weather-cli
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description: >-
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Query current weather, forecasts, and historical data from the OpenWeather
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API. Use when the user asks about the weather, forecasts, temperature,
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precipitation, wind, or climate conditions for a location.
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license: MIT
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compatibility: Requires weather-cli binary on PATH, OPENWEATHER_API_KEY
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set in environment or ~/.openweather.env
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metadata:
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tags: [weather, climate, api-client, openweather]
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---
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```
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```markdown
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# Weather CLI
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Query weather data from the OpenWeather API — current conditions, 7-day
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forecasts, and historical records for any location.
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## When to Use
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- User asks "what's the weather in [city]" or "is it going to rain today"
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- User asks about forecasts, temperature trends, wind, humidity, or pressure
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- User asks "how hot/cold/windy was it on [date]"
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- User wants to check weather across multiple locations
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Do NOT use for: severe weather alerts (use a dedicated alert skill),
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long-term climate projections, or weather data not available via
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OpenWeather API.
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## Setup
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Credentials are read from the `OPENWEATHER_API_KEY` environment variable
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or `~/.openweather.env`. If the agent gets a 401, guide the user to
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set up an API key at https://openweathermap.org/api and set the env var.
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Default units are metric. Pass `--units imperial` for Fahrenheit/mph.
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## Essential Commands
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### current — Current conditions for a location
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```bash
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weather-cli current "Raleigh, NC" # metric, human-readable
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weather-cli current "London, UK" --json # metric, machine-readable
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weather-cli current "New York, NY" --units imperial # Fahrenheit/mph
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```
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Output fields: `temperature`, `feels_like`, `humidity`, `wind_speed`,
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`conditions` (text description), `pressure`, `visibility`.
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### forecast — 7-day forecast
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```bash
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weather-cli forecast "Raleigh, NC" # human table
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weather-cli forecast "Raleigh, NC" --json --days 3 # 3-day forecast as JSON
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```
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JSON shape: `[{"date", "high", "low", "conditions", "precip_chance"}, ...]`.
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The `precip_chance` field is 0-100 (percentage). `conditions` uses
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OpenWeather's label strings (`Clear`, `Clouds`, `Rain`, etc.).
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### history — Historical data for a date
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```bash
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weather-cli history "Raleigh, NC" --date 2026-05-15
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weather-cli history "London, UK" --date 2025-12-25 --json
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```
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Historical data is available for dates up to 5 days before the current date
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(free tier) or full history (paid plans). The CLI will warn if data is
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unavailable for the requested range.
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## Location Format
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Accepts city names (`"Raleigh, NC"`), ZIP codes (`"27601"`), or
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latitude,longitude pairs (`"35.78,-78.64"`). City names with commas
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should be quoted. For disambiguation, prefer `"City, State/Country"`
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format over bare city names.
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## Known Gotchas
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- **City name ambiguity:** `"London"` resolves to London, UK. Use `"London, OH"`
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or `"London, Ontario"` for other cities.
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- **Units apply per-command:** `--units` is not sticky. Set it on every command
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or override with `WEATHER_CLI_UNITS=imperial` env var.
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- **Rate limit:** 60 requests/minute on free tier. Cache repeated location
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queries rather than fetching the same city twice.
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- **The `conditions` field uses OpenWeather's English labels** regardless of
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locale. Always compare against `"Clear"`, `"Clouds"`, `"Rain"`, `"Snow"`,
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`"Drizzle"`, `"Thunderstorm"`, or `"Atmosphere"` (fog, haze, etc.).
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```
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