Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
/plugin marketplace add lihtness/gnomon-mcpnpx agentmods add plugins/lihtness/gnomon-mcp/marketplacegit clone --depth 1 https://github.com/lihtness/gnomon-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/plugins/lihtness/gnomon-mcp/marketplace)<a href="https://agentmods.dev/plugins/lihtness/gnomon-mcp/marketplace"><img src="https://agentmods.dev/badge/plugins/lihtness/gnomon-mcp/marketplace.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
gnomon-mcp marketplace scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
{
"name": "gnomon-mcp",
"metadata": {
"description": "Marketplace hosting the gnomon Claude Code plugin — deterministic dates, math, and unit conversion for LLM agents."
},
"owner": {
"name": "Senthil Ramasamy"
},
"plugins": [
{
"name": "gnomon",
"description": "Deterministic dates, calendars, math, and unit conversion for LLM agents — stop next-token-guessing.",
"source": {
"source": "url",
"url": "https://github.com/lihtness/gnomon-mcp.git"
},
"homepage": "https://github.com/lihtness/gnomon-mcp"
}
]
}
The plugins it lists here
This marketplace lists 1 plugin kept in the same repository. Each has its own page, its own measurements and its own install command.
What ships with it
1 file beside marketplace.json in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 21 lines scan A 23907848b116
gnomon-mcp marketplace is a plugin published in the GitHub repository lihtness/gnomon-mcp (1 stars, last pushed 3mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other plugins, from other repositories
apple-pim
Native macOS integration for Calendar, Reminders, Contacts, and Mail using EventKit, Contacts, and JXA frameworks.
che-ical-mcp
macOS 行事曆與提醒事項 MCP Server - EventKit 整合，29 個工具，--cli 直接呼叫模式、--setup TCC 預授權、--self-update 自我升級+SHA-256 驗證、個別事件時區、復原/重做、週期事件 occurrence 操作、cleanupcompletedreminders 一鍵清除、清除到期日、星期驗證、MCP 層級 #標籤、冪等寫入、重複事件、地點觸發、結構化位置、彈性日期解析、模糊匹配、篩選/排序/限制.
automating-mac-apps
Automates macOS apps via Apple Events using AppleScript (discovery) and JXA (production logic). Use when asked about AppleScript, JXA, osascript, or macOS app automation.
airmcp
Governed MCP runtime for the Apple ecosystem and the connector layer between AI clients and Apple apps. The macOS runtime is available today and the iOS runtime is in preview, with visionOS and watchOS as roadmap targets. Profiles and progressive discovery keep the client surface focused; HMAC-chained audit logs…
seo-geo
SEO & GEO (Generative Engine Optimization) for websites. Optimize for AI search engines (ChatGPT, Perplexity, Gemini, Copilot, Claude) and traditional search (Google, Bing). Includes Princeton GEO research methods for +40% AI visibility.
calculator-mcp-server
Evaluate, simplify, and differentiate mathematical expressions via MCP. STDIO or Streamable HTTP.