diff --git a/.claude-plugin/marketplace.json b/.claude-plugin/marketplace.json
new file mode 100644
index 0000000..38a0afe
--- /dev/null
+++ b/.claude-plugin/marketplace.json
@@ -0,0 +1,22 @@
+{
+  "name": "marknest",
+  "owner": {
+    "name": "developer0hye",
+    "email": ""
+  },
+  "metadata": {
+    "description": "Convert Markdown to professional PDFs with themes, Mermaid diagrams, LaTeX math, and table of contents",
+    "version": "1.0.0"
+  },
+  "plugins": [
+    {
+      "name": "md2pdf",
+      "description": "Markdown to PDF conversion skill using marknest CLI — supports single files, folders, ZIP archives, GitHub URLs, themes, Mermaid diagrams, LaTeX math, and batch conversion",
+      "source": "./",
+      "strict": false,
+      "skills": [
+        "./skills/md2pdf"
+      ]
+    }
+  ]
+}
diff --git a/.gitignore b/.gitignore
index d161d3e..eaa697a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,7 @@ validation/.runs/
 
 # npm platform package binaries (populated during CI release)
 npm/marknest-*/bin/
+
+# Skill eval workspace (test artifacts)
+skills/md2pdf-workspace/
+skills/md2pdf/evals/
diff --git a/skills/md2pdf/SKILL.md b/skills/md2pdf/SKILL.md
new file mode 100644
index 0000000..2b553e2
--- /dev/null
+++ b/skills/md2pdf/SKILL.md
@@ -0,0 +1,190 @@
+---
+name: md2pdf
+description: >
+  Convert Markdown files to professional PDFs using marknest — a Rust-powered CLI that handles
+  single files, entire folders, ZIP archives, and even GitHub repository URLs. Use this skill
+  whenever the user wants to turn .md files into PDFs, generate printable documentation, export
+  markdown as PDF, batch-convert a docs folder, or create styled PDF reports from markdown.
+  Also trigger when the user mentions "markdown to PDF", "md to pdf", "export as PDF",
+  "print markdown", "PDF from README", "convert docs to PDF", or asks to make markdown
+  files look professional/printable. This skill covers theming, table of contents generation,
+  Mermaid diagram rendering, LaTeX math support, and custom styling — so use it even if the
+  user asks for "pretty PDFs", "styled documentation", or "PDF with diagrams and math".
+---
+
+# Marknest: Markdown to PDF Converter
+
+You are helping the user convert Markdown files into professional PDFs using **marknest**, a fast Rust-powered CLI tool.
+
+## Why marknest?
+
+marknest handles everything needed for high-quality PDF output from Markdown: embedded images, Mermaid diagrams, LaTeX math, syntax-highlighted code blocks, table of contents, and multiple built-in themes. It works locally with no cloud dependencies — all rendering assets are vendored. It accepts single files, folders, ZIP archives, and GitHub URLs as input.
+
+## Installation
+
+Before using marknest, check if it's available:
+
+```bash
+npx marknest --help
+```
+
+If not installed, install it. Prefer `npx` (zero-install) or npm global:
+
+```bash
+# Option 1: Use npx (no install needed, recommended)
+npx marknest convert ...
+
+# Option 2: Install globally via npm
+npm install -g marknest
+
+# Option 3: Install via Cargo (if Rust toolchain is available)
+cargo install marknest
+```
+
+**Browser requirement**: marknest uses Chromium for PDF rendering. If the user hits a browser-related error, run:
+
+```bash
+npx playwright install chromium
+```
+
+## Core Commands
+
+### Single file conversion
+
+```bash
+npx marknest convert README.md -o README.pdf
+```
+
+### Batch conversion (folder)
+
+```bash
+npx marknest convert ./docs --all --out-dir ./pdf
+```
+
+### From GitHub URL
+
+```bash
+npx marknest convert https://github.com/user/repo/blob/main/docs/guide.md -o guide.pdf
+```
+
+### From ZIP archive
+
+```bash
+npx marknest convert ./docs.zip --all --out-dir ./pdf
+```
+
+## Styling & Themes
+
+marknest has four built-in themes. Choose one that fits the user's needs:
+
+| Theme     | Best for                              |
+|-----------|---------------------------------------|
+| `default` | General purpose, clean look           |
+| `github`  | GitHub-flavored markdown appearance   |
+| `docs`    | Technical documentation               |
+| `plain`   | Minimal, no frills                    |
+
+```bash
+npx marknest convert README.md -o README.pdf --theme github
+```
+
+For custom styling, use `--css`:
+
+```bash
+npx marknest convert README.md -o README.pdf --css custom.css
+```
+
+## Advanced Features
+
+### Table of Contents
+
+```bash
+npx marknest convert README.md -o README.pdf --toc
+```
+
+### Mermaid Diagrams
+
+If the markdown contains Mermaid code blocks, enable rendering:
+
+```bash
+npx marknest convert README.md -o README.pdf --mermaid auto
+```
+
+### LaTeX Math
+
+If the markdown contains LaTeX math expressions:
+
+```bash
+npx marknest convert README.md -o README.pdf --math auto
+```
+
+### Page Layout
+
+```bash
+# Landscape orientation
+npx marknest convert README.md -o README.pdf --landscape
+
+# Custom page size
+npx marknest convert README.md -o README.pdf --page-size letter
+
+# Custom margins (pixels)
+npx marknest convert README.md -o README.pdf --margin-top 40 --margin-bottom 40
+```
+
+### PDF Metadata
+
+```bash
+npx marknest convert README.md -o README.pdf --title "Project Guide" --author "Team"
+```
+
+### Header/Footer Templates
+
+```bash
+npx marknest convert README.md -o README.pdf --header-template header.html
+```
+
+## Validation
+
+Before converting, you can validate markdown files to catch broken links and rendering issues:
+
+```bash
+npx marknest validate README.md
+npx marknest validate ./docs --all --strict
+```
+
+## Combining Multiple Options
+
+A typical full-featured conversion command:
+
+```bash
+npx marknest convert README.md -o README.pdf \
+  --theme github \
+  --toc \
+  --mermaid auto \
+  --math auto \
+  --title "Project Documentation" \
+  --author "Team Name"
+```
+
+## Decision Guide
+
+When the user asks to convert markdown to PDF, follow this logic:
+
+1. **Identify the input**: Single file? Folder? ZIP? GitHub URL?
+2. **Ask about styling** (if not specified): Theme preference? TOC needed?
+3. **Check for special content**: Does the markdown have Mermaid diagrams or LaTeX math? If yes, add `--mermaid auto` and/or `--math auto`.
+4. **Determine output**: Single PDF (`-o`) or batch (`--out-dir`)?
+5. **Run the command** and verify the output file exists.
+
+If the user has a `.marknest.toml` config file in their project, marknest will pick it up automatically — no need to pass flags that are already configured there.
+
+## Troubleshooting
+
+| Issue | Solution |
+|-------|----------|
+| "Browser not found" | Run `npx playwright install chromium` |
+| "Playwright runtime package was not found" | Run `npm ci --prefix <path shown in error>`, or set `MARKNEST_PLAYWRIGHT_RUNTIME_DIR` to a directory containing the playwright runtime |
+| Mermaid diagrams not rendering | Add `--mermaid auto` flag |
+| Math equations not rendering | Add `--math auto` flag |
+| Images missing in PDF | Check relative paths; marknest resolves them from the workspace root |
+| Permission denied on output | Check write permissions on the output directory |