# Openholidays (npm · @pipeworx/mcp-openholidays)

OpenHolidays MCP.

- Trust score: 84/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `gateway.pipeworx.io`: 85/100, [markdown](https://verifymcp.io/servers/pipeworx-io-openholidays/openholidays-mcp.md), [page](https://verifymcp.io/servers/pipeworx-io-openholidays/openholidays-mcp)
- npm · `@pipeworx/mcp-openholidays`: 84/100 (this document), [markdown](https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays.md), [page](https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays)

## Channel facts

- Registry: `npm`
- Package: `@pipeworx/mcp-openholidays`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-openholidays).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 1 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 601 tokens (~150/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Openholidays MCP server?

Openholidays runs locally as an npm package, launched with npx -y @pipeworx/mcp-openholidays. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pipeworx-io-openholidays -- npx -y @pipeworx/mcp-openholidays
```

### Cursor

```json
{
  "mcpServers": {
    "pipeworx-io-openholidays": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-openholidays"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pipeworx-io-openholidays": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-openholidays"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pipeworx-io-openholidays -- npx -y @pipeworx/mcp-openholidays
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pipeworx-io-openholidays": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pipeworx/mcp-openholidays"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pipeworx-io-openholidays --command npx --arg -y --arg @pipeworx/mcp-openholidays
```

### Hermes

```yaml
mcp_servers:
  pipeworx-io-openholidays:
    command: "npx"
    args: ["-y", "@pipeworx/mcp-openholidays"]
```

### Netclaw

```json
{
  "McpServers": {
    "pipeworx-io-openholidays": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pipeworx/mcp-openholidays"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pipeworx-io-openholidays -t stdio -c npx -a -y @pipeworx/mcp-openholidays
```

### Other

```json
{
  "mcpServers": {
    "pipeworx-io-openholidays": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-openholidays"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 84, +16)

- [security improvement] Malware scan: unverified → pass

### 2026-11-04 (score 68, −15)

- [security regression] Malware scan: pass → unverified
- [functional] Package version: 0.2.0 → 0.2.1

### 2026-11-03 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 81)

First indexed and scored.

## MCP tools (4)

### `public_holidays` (~180 tokens)

Public (statutory) holidays for a European country in a date range, with regional subdivisions. EUROPE-focused (~30 countries: DE, FR, NL, CH, IT, AT, BE, ES, PL, etc.). Returns each holiday with its localized name, dates, whether it is nationwide, and which subdivisions observe it. Keyless. For school terms/breaks use school_holidays instead.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. "DE", "FR", "NL", "CH", "IT".
- `language` (string): Language for names, ISO 639-1 (default "EN").
- `valid_from` (string, required): Start of date range, YYYY-MM-DD.
- `valid_to` (string, required): End of date range, YYYY-MM-DD.

### `school_holidays` (~207 tokens)

School holidays (term breaks: Christmas, Easter, summer, etc.) for a European country in a date range, optionally scoped to one subdivision. This is the unique value-add over worldwide public-holiday sources — school calendars vary by region. EUROPE-focused (~30 countries). Returns each break with its localized name, dates, and observing subdivisions. Keyless.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. "DE", "FR", "NL", "CH", "IT".
- `language` (string): Language for names, ISO 639-1 (default "EN").
- `subdivision_code` (string): Optional subdivision/region code to filter to, e.g. "DE-BY" (Bavaria). Use list_subdivisions to discover codes.
- `valid_from` (string, required): Start of date range, YYYY-MM-DD.
- `valid_to` (string, required): End of date range, YYYY-MM-DD.

### `list_countries` (~56 tokens)

List the ~30 European countries OpenHolidays covers, with their ISO codes and official languages. EUROPE-focused. Keyless.

Input parameters:

- `language` (string): Language for country names, ISO 639-1 (default "EN").

### `list_subdivisions` (~104 tokens)

List the regional subdivisions (federal states, regions, cantons, etc.) of a European country, with their codes and category. Use the returned codes to scope school_holidays. EUROPE-focused. Keyless.

Input parameters:

- `country` (string, required): ISO 3166-1 alpha-2 country code, e.g. "DE", "FR", "CH".
- `language` (string): Language for names, ISO 639-1 (default "EN").

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays#diagnostics

## Score history

- 2026-11-05: 84
- 2026-11-04: 68
- 2026-11-03: 83
- 2026-11-02: 82
- 2026-11-01: 82
- 2026-10-31: 82
- 2026-10-30: 81
- 2026-10-29: 81

## Common questions

### What is the Openholidays MCP server?

Openholidays is an MCP server listed in the public MCP registry as io.github.pipeworx-io/openholidays. OpenHolidays MCP. This page covers its npm package (@pipeworx/mcp-openholidays).

### Is the Openholidays MCP server safe to use?

Openholidays scores 84 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Openholidays MCP server expose?

Openholidays exposes 4 tools: public_holidays, school_holidays, list_countries, list_subdivisions. Their descriptions and schemas cost roughly 547 tokens of context every time the server is loaded.

### Is the Openholidays MCP server still maintained?

Openholidays is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Openholidays MCP server under?

Openholidays declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

### What did VerifyMCP test on the Openholidays MCP server?

VerifyMCP ran 16 checks on Openholidays, covering Malware scan, Known CVEs, Install scripts, Dependency health and 12 more. Endpoint Security and Transport & Reachability do not apply to an npm package, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- npm package: https://www.npmjs.com/package/@pipeworx/mcp-openholidays
- Socket report: https://socket.dev/npm/package/@pipeworx/mcp-openholidays
- Repository: https://github.com/pipeworx-io/mcp-openholidays
- Website: https://pipeworx.io/packs/openholidays
- Changelog RSS feed: https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays.xml
- Changelog JSON feed: https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays.json
- HTML version of this page: https://verifymcp.io/servers/pipeworx-io-openholidays/pipeworx-mcp-openholidays