First Ch Tools MCP Server
@first-ch/tools-mcp
npm
v0.28.0
Source verified
Published by first-ch — publish provenance cryptographically ties this package to that repository. That is proof of origin, not an official vendor package.
First CH Tools の計算ロジック（WCAGコントラスト比・文字数/Xウェイト・WebP変換・JSON-LD生成・llms.txt生成）をMCPツールとして提供するサーバー
The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.
1. Threat score — 100 − 0 = 100. What the published surface and source actually contain:
The deterministic scan raised no scored threat in the surface it inspected — the threat score stayed at 100. Capability observations and advisory notes are recorded but never lower it.
2. Client adoption risk — 100 − 6 = 94. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:
| Points | Adoption-risk factor |
|---|---|
| −6 | capability blast radius (high) — client exposure if the model is manipulated |
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind a deduction.
Findings 1
high Shell/command execution in server code (marp.mjs)MTC-SRC-002
In the server's implementation (`marp.mjs:16`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: { execFile } from 'node:child_process'; import { promisify } from 'node:util'; import { pathToFileURL } from 'node:url';
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server marp.mjs
Tools 30
Each tool and what it can reach — statically extracted from the published source.
aspect_ratio_calcno sensitive capabilitybase64_encodeno sensitive capabilitycase_convertno sensitive capabilitycolor_convertno sensitive capabilitycontrast_checkno sensitive capabilitycount_charsno sensitive capabilitycron_explainno sensitive capabilitycsv_convertno sensitive capabilitydiff_checkno sensitive capabilityencoding_convertno sensitive capability
Show 20 more tools ↓
hash_generateno sensitive capabilityhtml_escapeno sensitive capabilityjson_to_yamlno sensitive capabilityjsonld_generateno sensitive capabilityjwt_decodeno sensitive capabilityllmstxt_generateno sensitive capabilitymarkdown_tableno sensitive capabilitymarp_renderno sensitive capabilitypx_rem_convertno sensitive capabilityqr_generateno sensitive capabilityrobotstxt_generateno sensitive capabilitysql_formatno sensitive capabilitytestdata_generateno sensitive capabilityunixtime_convertno sensitive capabilityurl_paramsno sensitive capabilityuser_agent_parseno sensitive capabilityuuid_generateno sensitive capabilitywebp_convertno sensitive capabilityyaml_to_jsonno sensitive capabilityzenkaku_convertno sensitive capability
What this scan could not see
- Tools were statically extracted from the published source (30 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Versions 5
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v0.28.0 latest |
A 94/100 | 1 | 1.13.0 | 2026-09-09 |
v0.26.0 |
A 94/100 | 1 | 1.13.0 | 2026-09-01 |
v0.25.0 |
A 94/100 | 1 | 1.13.0 | 2026-08-29 |
v0.24.1 |
A 94/100 | 1 | 1.13.0 | 2026-08-27 |
v0.4.1 |
A 99/100 | 0 | 1.13.0 | 2026-08-25 |
Embed this score
Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.
Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
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