# Schengen 90/180 Calculator (remote · schengen-mcp.alickzheng618.workers.dev)

Schengen 90/180 rolling-window calculator MCP server: stay math, trip checks, rule explainer.

- Trust score: 62/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `schengen-mcp.alickzheng618.workers.dev`: 62/100 (this document), [markdown](https://verifymcp.io/servers/al157-schengen-mcp/schengen-mcp.md), [page](https://verifymcp.io/servers/al157-schengen-mcp/schengen-mcp)

## Channel facts

- Endpoint: `https://schengen-mcp.alickzheng618.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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 2026-10-18.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 228 tokens (~76/item across 3 items; 3 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 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 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the Schengen 90/180 Calculator MCP server?

Schengen 90/180 Calculator is a hosted endpoint at https://schengen-mcp.alickzheng618.workers.dev/mcp, so there is nothing to install locally. 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 --transport http al157-schengen-mcp 'https://schengen-mcp.alickzheng618.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "al157-schengen-mcp": {
      "url": "https://schengen-mcp.alickzheng618.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "al157-schengen-mcp": {
      "type": "http",
      "url": "https://schengen-mcp.alickzheng618.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.al157-schengen-mcp]
url = "https://schengen-mcp.alickzheng618.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "al157-schengen-mcp": {
      "type": "remote",
      "url": "https://schengen-mcp.alickzheng618.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add al157-schengen-mcp --url 'https://schengen-mcp.alickzheng618.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  al157-schengen-mcp:
    url: "https://schengen-mcp.alickzheng618.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "al157-schengen-mcp": {
      "Transport": "http",
      "Url": "https://schengen-mcp.alickzheng618.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add al157-schengen-mcp -t streamable-http -u 'https://schengen-mcp.alickzheng618.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "al157-schengen-mcp": {
      "type": "http",
      "url": "https://schengen-mcp.alickzheng618.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-10-17 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-15 (score 61, +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.

### 2026-10-13 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-12 (score 59, +1)

- [functional improvement] Stability: unverified → 0.07

### 2026-10-10 (score 58)

First indexed and scored.

## MCP tools (3)

### `calculate_stay` (~86 tokens)

Calculate Schengen stay

Evaluate Schengen 90/180 rolling-window usage for a list of trips. Returns days used in the window, days remaining, must-leave-by date, latest safe entry dates and a per-trip verdict.

Input parameters:

- `today` (string): Reference day; defaults to the current UTC date
- `trips` (array, required): Trips with inclusive entry/exit dates, format YYYY-MM-DD

### `check_trip` (~80 tokens)

Check a planned trip

Check whether ONE planned trip is legal on top of existing Schengen stays. Returns compliant/warning/over plus practical advice.

Input parameters:

- `existingTrips` (array): Already planned or taken trips (inclusive dates, YYYY-MM-DD)
- `planned` (object, required): The trip to check
- `today` (string): Reference day; defaults to the current UTC date

### `explain_90_180_rule` (~41 tokens)

Explain the 90/180 rule

Explain the Schengen 90/180 rolling-window rule with the EC 610/2013 reference and links to the interactive calculator and guide.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/al157-schengen-mcp/schengen-mcp#diagnostics

## Score history

- 2026-10-18: 62
- 2026-10-17: 62
- 2026-10-16: 61
- 2026-10-15: 61
- 2026-10-14: 60
- 2026-10-13: 60
- 2026-10-12: 59
- 2026-10-10: 58

## Common questions

### What is the Schengen 90/180 Calculator MCP server?

Schengen 90/180 Calculator is an MCP server listed in the public MCP registry as io.github.al157/schengen-mcp. Schengen 90/180 rolling-window calculator MCP server: stay math, trip checks, rule explainer. This page covers its hosted endpoint (https://schengen-mcp.alickzheng618.workers.dev/mcp).

### Is the Schengen 90/180 Calculator MCP server safe to use?

Schengen 90/180 Calculator scores 62 out of 100 on VerifyMCP. 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 Schengen 90/180 Calculator MCP server expose?

Schengen 90/180 Calculator exposes 3 tools: calculate_stay, check_trip, explain_90_180_rule. Their descriptions and schemas cost roughly 207 tokens of context every time the server is loaded.

### Does the Schengen 90/180 Calculator MCP server require authentication?

No. We connected to Schengen 90/180 Calculator without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Schengen 90/180 Calculator MCP server still maintained?

Schengen 90/180 Calculator is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://schengen-mcp.alickzheng618.workers.dev/mcp
- Repository: https://github.com/al157/schengen-calculator
- Website: https://schengen.al157.xyz/
- Changelog RSS feed: https://verifymcp.io/servers/al157-schengen-mcp/schengen-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/al157-schengen-mcp/schengen-mcp.json
- HTML version of this page: https://verifymcp.io/servers/al157-schengen-mcp/schengen-mcp