# Icyn Date (npm · @icyn/date-mcp)

Date context for agents: Chinese lunar calendar, solar terms, holidays for 12 regions. Offline.

- Trust score: 71/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-26

## Components

- npm · `@icyn/date-mcp`: 71/100 (this document), [markdown](https://verifymcp.io/servers/icyn12-tinker-icyn-date/icyn-date-mcp.md), [page](https://verifymcp.io/servers/icyn12-tinker-icyn-date/icyn-date-mcp)

## Channel facts

- Registry: `npm`
- Package: `@icyn/date-mcp`
- Version: `0.1.5`
- 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 2026-09-26.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 31 of 97 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 4 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 72/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1423 tokens (~129/item across 11 items; 11 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 90/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 69% 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 11 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 12 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 Icyn Date MCP server?

Icyn Date runs locally as an npm package, launched with npx -y @icyn/date-mcp. 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 icyn12-tinker-icyn-date -- npx -y @icyn/date-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "icyn12-tinker-icyn-date": {
      "command": "npx",
      "args": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "icyn12-tinker-icyn-date": {
      "command": "npx",
      "args": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add icyn12-tinker-icyn-date -- npx -y @icyn/date-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "icyn12-tinker-icyn-date": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@icyn/date-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add icyn12-tinker-icyn-date --command npx --arg -y --arg @icyn/date-mcp
```

### Hermes

```yaml
mcp_servers:
  icyn12-tinker-icyn-date:
    command: "npx"
    args: ["-y", "@icyn/date-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "icyn12-tinker-icyn-date": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add icyn12-tinker-icyn-date -t stdio -c npx -a -y @icyn/date-mcp
```

### Other

```json
{
  "mcpServers": {
    "icyn12-tinker-icyn-date": {
      "command": "npx",
      "args": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-09-25 (score 71, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-22 (score 70, +32)

- [security improvement] Injection markers: unverified → pass
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] Stability: unverified → 0.07
- [functional improvement] MCP protocol: unverified → pass

### 2026-09-21 (score 38, −31)

- [security regression] Tool safety: pass → unverified
- [security] Stability: Stability not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified
- [functional] Package version: 0.1.4 → 0.1.5

### 2026-09-20 (score 69)

First indexed and scored.

## MCP tools (11)

### `date_context` (~106 tokens)

Everything known about one date in one region: weekday/ISO week, workday status with source & confidence, holiday, lunar date & 干支, current/next solar term.

Input parameters:

- `date` (string, required): ISO date YYYY-MM-DD
- `lang` (string)
- `region` (string): Region code, case-insensitive: CN HK MO TW JP KR VN SG US GB DE FR, or a subdivision like US-CA, DE-BY, GB-SCT

### `is_workday` (~88 tokens)

Is this date a working day in the region? Answers carry source (official/baseline/predicted) and confidence.

Input parameters:

- `date` (string, required): ISO date YYYY-MM-DD
- `region` (string): Region code, case-insensitive: CN HK MO TW JP KR VN SG US GB DE FR, or a subdivision like US-CA, DE-BY, GB-SCT

### `holidays` (~94 tokens)

List public holidays of a region for a year, or within a date range.

Input parameters:

- `from` (string): ISO date YYYY-MM-DD
- `region` (string): Region code, case-insensitive: CN HK MO TW JP KR VN SG US GB DE FR, or a subdivision like US-CA, DE-BY, GB-SCT
- `to`: ISO date YYYY-MM-DD
- `year` (integer)

### `workdays` (~119 tokens)

Workday arithmetic: list or count workdays in a range, or move N workdays from a date (negative = backwards).

Input parameters:

- `add` (integer): Move this many workdays from `from` instead of listing a range
- `from` (string, required): ISO date YYYY-MM-DD
- `region` (string): Region code, case-insensitive: CN HK MO TW JP KR VN SG US GB DE FR, or a subdivision like US-CA, DE-BY, GB-SCT
- `to`: ISO date YYYY-MM-DD

### `next_long_weekend` (~91 tokens)

Next stretch of at least N consecutive non-working days from a date (holiday + weekend runs).

Input parameters:

- `from` (string, required): ISO date YYYY-MM-DD
- `minDays` (integer)
- `region` (string): Region code, case-insensitive: CN HK MO TW JP KR VN SG US GB DE FR, or a subdivision like US-CA, DE-BY, GB-SCT

### `holiday_eve` (~75 tokens)

Is this date the last working day before a public holiday?

Input parameters:

- `date` (string, required): ISO date YYYY-MM-DD
- `region` (string): Region code, case-insensitive: CN HK MO TW JP KR VN SG US GB DE FR, or a subdivision like US-CA, DE-BY, GB-SCT

### `lunar` (~56 tokens)

Convert a solar date to the Chinese lunar calendar (year/month/day, leap month, 干支, zodiac), or a lunar date to solar.

Input parameters:

- `date` (string): ISO date YYYY-MM-DD
- `lunar` (object)

### `next_lunar_date` (~61 tokens)

Next solar date on which a lunar month/day occurs (e.g. a lunar birthday or 中秋 8/15).

Input parameters:

- `day` (integer, required)
- `from` (string, required): ISO date YYYY-MM-DD
- `month` (integer, required)

### `solar_terms` (~34 tokens)

The 24 solar terms (节气) of a year with exact instants (UTC).

Input parameters:

- `year` (integer, required)

### `regions_observing` (~242 tokens)

Which regions take a canonical festival off in a given year (e.g. lunar-new-year, mid-autumn, christmas), and on which dates.

Input parameters:

- `festival` (string, required): One of: all-saints, armed-forces-day, armistice, ascension, assumption, autumnal-equinox, bank-holiday, boxing-day, childrens-day, christmas, columbus-day, coming-of-age, constitution-day, culture-da…
- `year` (integer, required)

### `regions` (~18 tokens)

Supported regions, subdivisions, data coverage and data version.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/icyn12-tinker-icyn-date/icyn-date-mcp#diagnostics

## Score history

- 2026-09-26: 71
- 2026-09-25: 71
- 2026-09-24: 70
- 2026-09-23: 70
- 2026-09-22: 70
- 2026-09-21: 38
- 2026-09-20: 69

## Common questions

### What is the Icyn Date MCP server?

Icyn Date is an MCP server listed in the public MCP registry as io.github.icyn12-tinker/icyn-date. Date context for agents: Chinese lunar calendar, solar terms, holidays for 12 regions. Offline. This page covers its npm package (@icyn/date-mcp).

### Is the Icyn Date MCP server safe to use?

Icyn Date scores 71 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 26 September 2026. It declares no install or post-install scripts. 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 Icyn Date MCP server expose?

Icyn Date exposes 11 tools: date_context, is_workday, holidays, workdays, next_long_weekend, and 6 more. Their descriptions and schemas cost roughly 984 tokens of context every time the server is loaded.

### Is the Icyn Date MCP server still maintained?

Icyn Date is still listed as active in the MCP registry. We last reached this channel on 26 September 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 Icyn Date MCP server under?

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

## Links

- npm package: https://www.npmjs.com/package/@icyn/date-mcp
- Socket report: https://socket.dev/npm/package/@icyn/date-mcp
- Repository: https://github.com/icyn12-tinker/icyndate
- Changelog RSS feed: https://verifymcp.io/servers/icyn12-tinker-icyn-date/icyn-date-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/icyn12-tinker-icyn-date/icyn-date-mcp.json
- HTML version of this page: https://verifymcp.io/servers/icyn12-tinker-icyn-date/icyn-date-mcp