Overview
Provide a two-letter country code to receive an array of holidays containing local dates, official names, and classifications such as public, observance, or optional. Free plans return holidays for the default calendar year. Upgrading to a paid plan allows querying specific years and adds ISO 8601 UTC start and end timestamps.
Live Test World Holidays Grounding Data Source →
The tool
Once your client is connected to the VerveContext server, this appears in its tool list as WorldHolidaysGroundingData. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.
{
"name": "WorldHolidaysGroundingData",
"arguments": {
"country": "US"
}
}You do not name the tool yourself; the model picks it. Asking about US in the terms this source covers is enough for it to reach for WorldHolidaysGroundingData on its own — naming it explicitly also works, and is the way to force the call.
Connecting
One server URL covers every source in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.
{
"mcpServers": {
"vervecontext": {
"url": "https://api.vervecontext.com/v1/mcp"
}
}
}https://api.vervecontext.com/v1/mcpPer-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.
Arguments
These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.
| Argument | Type | Description |
|---|---|---|
countryRequired | string | The 2-letter country code for which you want to get the holidays length 2–2 |
yearOptionalPremium | integer | The year for which you want to get the holidays default 2026 · range 2000–2050 |
What the model gets back
The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.
{
"status": "ok",
"error": null,
"data": {
"country": "US",
"year": "2025",
"holidays": [
{
"date": "2025-01-01 00:00:00",
"start": "2025-01-01T05:00:00Z",
"end": "2025-01-02T05:00:00Z",
"name": "New Year's Day",
"type": "public"
},
{
"date": "2025-01-20 00:00:00",
"start": "2025-01-20T05:00:00Z",
"end": "2025-01-21T05:00:00Z",
"name": "Martin Luther King Jr. Day",
"type": "public"
},
{
"date": "2025-02-14 00:00:00",
"start": "2025-02-14T05:00:00Z",
"end": "2025-02-15T05:00:00Z",
"name": "Valentine's Day",
"type": "observance"
},
{
"date": "2025-02-17 00:00:00",
"start": "2025-02-17T05:00:00Z",
"end": "2025-02-18T05:00:00Z",
"name": "Washington's Birthday",
"type": "public"
},
{
"date": "2025-03-17 00:00:00",
"start": "2025-03-17T04:00:00Z",
"end": "2025-03-18T04:00:00Z",
"name": "St. Patrick's Day",
"type": "observance"
},
{
"date": "2025-04-15 00:00:00",
"start": "2025-04-15T04:00:00Z",
"end": "2025-04-16T04:00:00Z",
"name": "Tax Day",
"type": "observance"
},
{
"date": "2025-04-20 00:00:00",
"start": "2025-04-20T04:00:00Z",
"end": "2025-04-21T04:00:00Z",
"name": "Easter Sunday",
"type": "observance"
},
{
"date": "2025-04-23 00:00:00",
"start": "2025-04-23T04:00:00Z",
"end": "2025-04-24T04:00:00Z",
"name": "Administrative Professionals Day",
"type": "observance"
},
{
"date": "2025-05-11 00:00:00",
"start": "2025-05-11T04:00:00Z",
"end": "2025-05-12T04:00:00Z",
"name": "Mother's Day",
"type": "observance"
},
{
"date": "2025-05-26 00:00:00",
"start": "2025-05-26T04:00:00Z",
"end": "2025-05-27T04:00:00Z",
"name": "Memorial Day",
"type": "public"
},
{
"date": "2025-06-15 00:00:00",
"start": "2025-06-15T04:00:00Z",
"end": "2025-06-16T04:00:00Z",
"name": "Father's Day",
"type": "observance"
},
{
"date": "2025-06-19 00:00:00",
"start": "2025-06-19T04:00:00Z",
"end": "2025-06-20T04:00:00Z",
"name": "Juneteenth",
"type": "public"
},
{
"date": "2025-07-04 00:00:00",
"start": "2025-07-04T04:00:00Z",
"end": "2025-07-05T04:00:00Z",
"name": "Independence Day",
"type": "public"
},
{
"date": "2025-09-01 00:00:00",
"start": "2025-09-01T04:00:00Z",
"end": "2025-09-02T04:00:00Z",
"name": "Labor Day",
"type": "public"
},
{
"date": "2025-10-13 00:00:00",
"start": "2025-10-13T04:00:00Z",
"end": "2025-10-14T04:00:00Z",
"name": "Columbus Day",
"type": "public"
},
{
"date": "2025-10-31 18:00:00",
"start": "2025-10-31T22:00:00Z",
"end": "2025-11-01T04:00:00Z",
"name": "Halloween",
"type": "observance"
},
{
"date": "2025-11-11 00:00:00",
"start": "2025-11-11T05:00:00Z",
"end": "2025-11-12T05:00:00Z",
"name": "Veterans Day",
"type": "public"
},
{
"date": "2025-11-27 00:00:00",
"start": "2025-11-27T05:00:00Z",
"end": "2025-11-28T05:00:00Z",
"name": "Thanksgiving Day",
"type": "public"
},
{
"date": "2025-11-28 00:00:00",
"start": "2025-11-28T05:00:00Z",
"end": "2025-11-29T05:00:00Z",
"name": "Day after Thanksgiving Day",
"type": "observance"
},
{
"date": "2025-12-24 00:00:00",
"start": "2025-12-24T05:00:00Z",
"end": "2025-12-25T05:00:00Z",
"name": "Christmas Eve",
"type": "optional"
},
{
"date": "2025-12-25 00:00:00",
"start": "2025-12-25T05:00:00Z",
"end": "2025-12-26T05:00:00Z",
"name": "Christmas Day",
"type": "public"
},
{
"date": "2025-12-31 00:00:00",
"start": "2025-12-31T05:00:00Z",
"end": "2026-01-01T05:00:00Z",
"name": "New Year's Eve",
"type": "observance"
}
]
}
}
Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
country | string | US | 2-letter country code for the queried holidays |
year | string | 2025 | Year for which holidays were retrieved |
holidays | array[22] | Array of holiday objects with date and details | |
holidays.0.date | string | 2025-01-01 00:00:00 | Holiday date in local timezone |
holidays.0.startPremium | string | 2025-01-01T05:00:00Z | Holiday start time in ISO 8601 UTC format |
holidays.0.endPremium | string | 2025-01-02T05:00:00Z | Holiday end time in ISO 8601 UTC format |
holidays.0.name | string | New Year's Day | Official name of the holiday or observance |
holidays.0.type | string | public | Holiday type (public, observance, optional, etc.) |
Why ground on it
A model can produce something that looks like this answer from its training data, and be confidently out of date or simply wrong. This source returns the current value in a shape you can check, which is the difference between an answer you can cite and one you have to hedge.
Point an evaluation at holidays.0.date: it is the field most worth pinning a claim to, and it is either present and current or absent — never plausibly invented.
Failure modes
Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.
| Status | What it means |
|---|---|
400 / 422 | The arguments did not validate. The message names the offending one. |
401 | The OAuth session is invalid or expired — reconnect the server. |
403 | Blocked by a key restriction or an IP allow-list. Never a bad identity. |
404 | This source is not part of VerveContext. Check the catalog. |
429 | Out of credits, or a brief rate limit. The message tells them apart. |
A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.
Use cases
- Payroll and Leave Management
- Human resource platforms check holiday types and dates to calculate paid time off and country-specific overtime rates for distributed teams.
- Cross-Border Delivery Scheduling
- Logistics systems adjust estimated delivery dates when a recipient country observes national or statutory business closures.
- Global Meeting Booking
- Calendar schedulers flag national observances in a participant's region before coordinating calls across international time zones.
- International Campaign Timing
- Marketing tools avoid dispatching promotional email blasts on statutory holidays across target geographic markets.
Other ways to use World Holidays Grounding Data
Set up World Holidays Grounding Data on VerveContext, or reach the same source a different way. Your VerveContext account and credits work on all of them — one key, one balance.
Related
More in Calendar: