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Add MCPB packaging and Claude Code plugin for pdf-server (#491)

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* Add MCPB packaging and Claude Code plugin for pdf-server

Two distribution paths for the pdf-server:

1. **MCPB bundle** (Claude Desktop MCP Directory):
   - manifest.json: v0.3 manifest with tools, compatibility, privacy
   - .mcpbignore: excludes source/tests from bundle
   - icon.png: 64x64 PDF document icon

2. **Claude Code plugin** (plugin/):
   - .mcp.json: declares local stdio server via npx
   - commands: /pdf-research:read, /pdf-research:summarize
   - skills: pdf-reading skill for document navigation
   - Tested end-to-end: MCP server connects, all tools available

The plugin uses a local stdio MCP server pattern — the first known
instance in a knowledge-work plugin (all existing plugins use remote
HTTP connectors).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Run prettier:fix to satisfy CI formatting checks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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examples/pdf-server/plugin/skills/pdf-reading/SKILL.md Normal file
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---
name: pdf-reading
description: Read and navigate PDF documents using the local PDF server. Reference this when the user wants to open, read, search, or interact with any PDF file or academic paper.
---
# PDF Reading
You have access to a local PDF server that provides interactive document viewing.
## Available Tools
- **list_pdfs** -- Show available PDFs. Call with no arguments.
- **display_pdf** -- Open a PDF in the interactive viewer.
- `url` (string): URL or local file path
- `page` (number, optional): Starting page number
## How to Use
**When the user mentions a PDF, paper, or document:**
1. If they give a URL or path, call `display_pdf` directly
2. If they say "open the paper" without specifying, call `list_pdfs` to show options
3. After displaying, offer to summarize, extract data, answer questions
**arXiv shortcuts:**
- `arxiv.org/abs/2301.12345` is auto-converted to the PDF URL
- Users can just say "open arxiv 2301.12345"
**Supported remote sources:**
arXiv, bioRxiv, medRxiv, chemRxiv, Zenodo, OSF, HAL Science, SSRN
## Best Practices
- Always display the PDF before trying to analyze it
- For multi-page documents, ask which section the user cares about
- When comparing papers, display them one at a time and note key differences