mcp-jp-calendar (skypier-jp-works/mcp-jp-calendar) is an MCP server listed on the M8ven Trust Index. It scores 62 out of 100, grade C. It declares 7 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Caution
62/100

mcp-jp-calendar

Provides accurate Japanese business day utilities including holiday checks, settlement day calculations, and fiscal period determination, all with embedded holiday data from 2020-2030.

→ skypier-jp-works/mcp-jp-calendar· listed on glama

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

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Who stands behind it

skypier-jp-works

Source: Glama

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Install from

Glamanot scored here

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
⚠️
Known vulnerabilities in dependencies: 3 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
// tools this server exposes7 tools

These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.

is_business_day

指定した日が営業日かどうかを判定します。土日・日本の祝日・振替休日・国民の休日・会社独自の休業日を考慮します。

add_business_days

指定日から N 営業日後(Nが負の場合はN営業日前)の日付を返します。

count_business_days

2つの日付の間(両端を含む)の営業日数を数えます。

next_gotobi

指定日以降で最も近い五十日(ごとおび。5日・10日・15日・20日・25日・月末)を返します。その日が休日の場合は、直前の営業日に前倒しした実際の日付も一緒に返します。

month_end_info

指定月の月末日と、月末が休日の場合に前倒しした実質的な締め日を返します。

fiscal_period

指定日が何年度の第何四半期かを返します。年度の開始月は指定可能(省略時は4月)。

list_holidays
// known CVEs in dependencies3 high

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.13.0GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.13.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.13.0GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

7/7 tools missing one or more hints — is_business_day (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); add_business_days (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); count_business_days (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +4 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool inputs are validated

4/7 tool handlers declare input schemas (57%)

Declare an inputSchema with zod/joi/yup on every tool definition.

Production dependencies are patched

0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.13.0 (high), @modelcontextprotocol/sdk@1.13.0 (high)

Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
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commit: 11fe6817c16560eaf89a5d241822b7cef76d6a9e
code hash: 8c24a0476d6bcfff5ff000e92ceaf3efaf0c8aa7bf3d00a9f2c1c5da8269bc28
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