World Business Calendar
NPM · @APPMONSTER/MCP-WORLD-CALENDAR
Public holidays and working-day math for 200+ countries and regions, local weekends. No keys.
Available components
Last scanned (6 hours ago)
Scores higher than 49% of npm servers
Category Productivity and Notes
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. How we score → Why this is hard to score →
Supply Chain Security81
- No malware found by supply-chain analysis.Pass
- CVE check failed: a known high-severity CVE affects zod 3.25.76, a direct dependency. A fixed version is available. View diagnostics → Fail
- No install/post-install scripts declared.Pass
- 36 of 109 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency100
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Cryptographically verified build provenance (signed, bound to groove79/kmcp). View diagnostics → Pass
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 0 days ago).Pass
- Publishes a security disclosure policy (SECURITY.md).Pass
Schema Quality & AI Usability68
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 680 tokens (~136/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management0
- Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified
Tool Coverage90
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 71% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Unverified: 1 category
A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 24 Oct 26 +15
- Malware scan: unverified → pass ▲ security
- 23 Oct 26 59
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 24 Oct 2026 · Analysed npm/@appmonster/mcp-world-calendar@0.1.0
Provenance Verified
A signed build attestation was found and verified, binding this exact artifact to the source repository it claims to come from.
| Result | Verified |
|---|---|
| Ecosystem | npm |
| Reason | Verified |
| Discovered via | Registry attestation endpoint |
| Source repo | groove79/kmcp |
| Certificate issuer | https://token.actions.githubusercontent.com |
| Certificate SAN | https://github.com/groove79/kmcp/.github/workflows/publish.yml@refs/tags/world-calendar-v0.1.0 |
| Rekor log index | 3423329821 |
| Predicate type | SLSA build provenance https://slsa.dev/provenance/v1 |
| Subject digest | sha512:98fec81d453284234d3270eac6e8e990126655fc6b50d531a5f25cd685980e40b0157e9a51a7b4d1496bf6de1227bd45b6ad53f46d2cb7109c3857d44 |
Background: How many MCP packages publish verified provenance →
Vulnerabilities 1 finding
| ID | CVE | Severity | Vector | Fix available |
|---|---|---|---|---|
| GHSA-mrhx-c7xc-m3w5 | CVE-2023-54404 | high | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | yes |
Background: What a vulnerability scan can and cannot prove →
Dependencies 109 packages
| Packages resolved | 109 |
|---|---|
| Stale | 36 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
world_add_business_days ~196
Add or subtract N working days in a country (skipping its weekends and public holidays), or count working days between two dates. Use for delivery ETAs, contract or payment deadlines, SLA due dates. Needs country, from (default today there) and either days or to.
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | yes | ISO 3166-1 alpha-2 country code, e.g. US, GB, DE, JP, IN, AE |
| days | integer | – | – |
| extraHolidays | array | – | Company days off to treat as holidays |
| from | string | – | yyyy-MM-dd |
| includeBank | boolean | – | Also treat bank holidays as days off (default: public holidays only) |
| region | string | – | Optional state/region code, e.g. CA (California) for US, BY (Bavaria) for DE. Regional holidays differ. |
| to | – | – | yyyy-MM-dd |
No output schema declared.
No examples provided.
world_common_business_days ~76
Find dates that are working days in ALL of several countries (e.g. US, DE and JP teams), between two dates — for meetings, settlements or launches across borders. Max 10 countries, 92 days.
| Name | Type | Req | Description |
|---|---|---|---|
| countries | array | yes | – |
| from | string | yes | yyyy-MM-dd |
| to | – | yes | – |
No output schema declared.
No examples provided.
world_is_business_day ~180
Tell whether a date is a working day in a country (not a weekend there, not a public holiday), and give the next and previous working days. Knows local weekends (Friday–Saturday in Saudi Arabia, Israel, Egypt…). Default date is today in that country.
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | yes | ISO 3166-1 alpha-2 country code, e.g. US, GB, DE, JP, IN, AE |
| date | string | – | yyyy-MM-dd |
| extraHolidays | array | – | Company days off to treat as holidays |
| includeBank | boolean | – | Also treat bank holidays as days off (default: public holidays only) |
| region | string | – | Optional state/region code, e.g. CA (California) for US, BY (Bavaria) for DE. Regional holidays differ. |
No output schema declared.
No examples provided.
world_list_countries ~71
List supported country codes (200+) or, with country, its state/region codes for regional holidays.
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | – | ISO 3166-1 alpha-2 country code, e.g. US, GB, DE, JP, IN, AE |
| search | string | – | – |
No output schema declared.
No examples provided.
world_list_holidays ~157
List public holidays of a country (and optionally a state/region) for a year, with English and local names and substitute (observed) days. 200+ countries. Use for scheduling across countries, shipping cut-offs, payroll or market-closed days. Set types to include bank/optional/observance days.
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | yes | ISO 3166-1 alpha-2 country code, e.g. US, GB, DE, JP, IN, AE |
| region | string | – | Optional state/region code, e.g. CA (California) for US, BY (Bavaria) for DE. Regional holidays differ. |
| types | array | – | – |
| year | integer | yes | – |
No output schema declared.
No examples provided.
How do I install the World Business Calendar MCP server?
World Business Calendar runs locally as an npm package, launched with npx -y @appmonster/mcp-world-calendar. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · @appmonster/mcp-world-calendar
claude mcp add groove79-mcp-world-calendar -- npx -y @appmonster/mcp-world-calendar
What is the World Business Calendar MCP server?
World Business Calendar is an MCP server listed in the public MCP registry as io.github.groove79/mcp-world-calendar. Public holidays and working-day math for 200+ countries and regions, local weekends. No keys. This page covers its npm package (@appmonster/mcp-world-calendar).
Is the World Business Calendar MCP server safe to use?
World Business Calendar scores 74 out of 100 on VerifyMCP. We recorded 1 known advisory against it as of 24 October 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 World Business Calendar MCP server expose?
World Business Calendar exposes 5 tools: world_list_holidays, world_is_business_day, world_add_business_days, world_common_business_days, world_list_countries. Their descriptions and schemas cost roughly 680 tokens of context every time the server is loaded.
Is the World Business Calendar MCP server still maintained?
World Business Calendar is still listed as active in the MCP registry. We last reached this channel on 24 October 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 World Business Calendar MCP server under?
World Business Calendar declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.