Add SnapTool plugin — 49 developer tools for AI agents

[RexHuang]

What

Adds SnapTool as a Claude Code plugin under Development Engineering.

Why

SnapTool gives Claude Code instant access to 49 real, working developer utilities via a single REST API endpoint:

• Formatters (11): JSON, CSS, HTML, SQL, XML (format + minify)
• Encoders (6): Base64, URL, HTML entities (encode + decode)
• Hash & Crypto (6): MD5, SHA-1/256/384/512, JWT decode
• Generators (6): UUID, password, slug, lorem ipsum, meta tags, robots.txt
• Text Tools (12): Case conversion (8 modes), reverse, word count, diff, find-replace
• Converters (6): CSV↔JSON, number base, timestamp, color, unit
• Network (2): Regex tester, URL to Markdown

Unique value

• Real API backend — not just prompt instructions, but 49 working endpoints
• Free tier — 50 calls/month, no credit card
• Multi-protocol — MCP + OpenAPI 3.1 + llms.txt + AI Plugin
• Skills repo: https://github.com/RexHuang/snaptool-skills
• Website: https://snaptools.uk

Plugin structure

plugins/snaptool/
  CLAUDE.md          — Agent instructions + API call examples
  agents/snaptool.md — Agent definition
  skills/snaptool-dev-tools.md — Full 49-tool SKILL.md