baseline

Baseline Web Feature Status Skill

Query the Web Platform Status API to check browser Baseline status of web features.

Query Building

Endpoint: GET https://api.webstatus.dev/v1/features?q={query}

Operators

Operator	Example
available_date:<browser>:<start>..<end>	available_date:chrome:2023-01-01..2024-01-01
available_on:<browser>	available_on:chrome
baseline_date:<start>..<end>	baseline_date:2023-01-01..2024-01-01
baseline_status:<status>	baseline_status:widely
group:<group>	group:css
name:<keyword>	name:grid
snapshot:<snapshot>	snapshot:ecmascript-5
(plain text)	grid

• Statuses: widely, newly, limited, no_data
• Browsers: chrome, edge, firefox, safari
• AND: separate with spaces
• OR: join with +OR+
• Negate: prefix with -

Natural Language Translation

Translate the user's intent into operators. Show the translated query so the user can learn the syntax.

User input	API query
popover	name:popover
css nesting	name:nesting
Promise.withResolvers	name:promise-withresolvers
not:safari	-available_on:safari
Safariで使えるけどFirefoxで使えない機能	available_on:safari -available_on:firefox
dialogかpopoverの対応状況	name:dialog+OR+name:popover

Output Format

Adapt to result count: detail for 5 or fewer, summary table for more.

Example (single feature)

## Feature: Popover API

**Baseline status**: Newly available — supported in all major browsers, but some users may not have updated yet.

**Support dates**:
- Newly available: 2024-04-17

**Browser support**:
- Chrome: 114 (2023-05-30)
- Edge: 114 (2023-06-02)
- Firefox: 125 (2024-04-16)
- Safari: 17 (2023-09-18)

**Daily usage (Chrome)**: 8.2%

For 5+ results, use a summary table (feature name + baseline status). Limit to first 20, showing total count.

Constraints

• If the API returns empty results or an error, suggest alternative queries
• If argument is empty, ask the user for a feature name or query
• Usage daily is a fraction (0–1); display as percentage
• Timeout after 10 seconds
• Maximum 3 concurrent API requests