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 First-CH/firstch-tools-mcpnpx agentmods add plugins/first-ch/firstch-tools-mcp/firstch-toolsgit clone --depth 1 https://github.com/First-CH/firstch-tools-mcpGrade A, and why
firstch-tools 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 yesterday.
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": "firstch-tools",
"displayName": "First CH Tools",
"version": "0.26.0",
"description": "MCP tools for WCAG contrast check, JP character/X-weight count, WebP conversion, JSON-LD generation, llms.txt generation, encoding/line-ending conversion, Marp Markdown→slide rendering, test data generation, text/code diffing, cron-expression explanation, Base64/data-URI encoding, URL parameter editing, HTML entity escaping/unescaping, px ⇄ rem/em unit conversion, HEX/RGB/HSL/OKLCH colour conversion with alpha compositing, MD5/SHA-1/SHA-256/SHA-384/SHA-512 hashing with checksum verification, JWT decoding with expiry and signature checks, User-Agent parsing with browser, engine, OS, device and bot detection, bulk UUID v4 / ULID generation, aspect-ratio calculation with responsive sizing, Markdown table formatting with TSV/CSV conversion, SQL query formatting, QR code generation (SVG / PNG), Unix timestamp ⇄ ISO 8601 / local-time conversion, robots.txt generation with AI-crawler presets, and case conversion (camelCase / snake_case / kebab-case and eight more) — the same logic that powers tools.first-ch.com.",
"author": {
"name": "First CH LLC",
"url": "https://first-ch.com"
},
"homepage": "https://tools.first-ch.com",
"repository": "https://github.com/First-CH/firstch-tools-mcp",
"license": "MIT"
}
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.
- yesterday First seen · 14 lines scan A c7ffa8ec4431
firstch-tools is a plugin published in the GitHub repository First-CH/firstch-tools-mcp (0 stars, last pushed 3d 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.
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