feat: optimize SKILL.md score (56% → 85%) + add Tessl review action

[rohan-tessl]

Hey @DaWe35 👋

I ran your skills through tessl skill review at work and found some targeted improvements. Here's the full before/after:

Skill	Before	After	Change
image-router	56%	85%	+29%

This PR covers your 1 skill in the repo.

What changed in image-router

• Description rewritten with concrete action verbs, an explicit "Use when..." clause listing trigger scenarios (create images, generate AI art, stylize photos, inpainting, etc.), and specific capability listing (text-to-image, image-to-image, multi-image composition, masks)
• Added user-invocable: true and triggers array with 10 natural trigger terms for frontmatter compliance
• Fixed skill name to kebab-case (imagerouter → image-router) and flattened metadata to string key-value pairs with version field
• Restructured content — clearer setup steps, dedicated model discovery section, parameters as a scannable table instead of a bullet list
• Added error handling table with HTTP status codes, causes, and fixes (401, 400, 429, 5xx)
• Removed redundant Tips section and duplicate quick-test example that restated content already demonstrated above

Tessl Skill Review GitHub Action ✅

I've also included a GitHub Action (.github/workflows/skill-review.yml) that automatically reviews any SKILL.md changed in future PRs and posts scores as a PR comment.

What this gives you:

• 🔍 Automatic tessl skill review runs on every PR touching SKILL.md
• 💬 One updated PR comment with scores and improvement feedback
• 🔓 Zero extra accounts — contributors don't need a Tessl login; only GITHUB_TOKEN is used
• ✅ Non-blocking by default — feedback-only, no surprise red CI (add fail-threshold: 70 later if you want a hard gate)
• 📈 Covers future skills incrementally as contributors edit them

Want automatic AI optimization on every SKILL.md change? 🚀

The action I've added gives you review scores on PRs. We also have a more powerful variant — tesslio/skill-review-and-optimize — that can:

• Run AI-powered optimization suggestions on every SKILL.md PR (requires adding TESSL_API_TOKEN as a repo secret)
• Let contributors accept suggested improvements by commenting /apply-optimize
• Still works in review-only mode with zero secrets

Interested? Tick the box and I'll raise a follow-up PR:

• Yes please! Add the tesslio/skill-review-and-optimize action so every SKILL.md PR gets AI optimization suggestions + the /apply-optimize flow
• No thanks — the review scores action is enough for now

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Honest disclosure — I work at @tesslio where we build tooling around skills like these. Not a pitch — just saw room for improvement and wanted to contribute.

Want to self-improve your skills? Just point your agent (Claude Code, Codex, etc.) at this Tessl guide and ask it to optimize your skill. Ping me — @rohan-tessl — if you hit any snags.

Thanks in advance 🙏