go-docs-mcp

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<h1 align="center">Go-Docs MCP</h1>

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Install and Go. One command, single binary. Your AI reads any document — PDF, text, Markdown, DOCX, images.

MCP server for multi-format document access — read, search, extract images, OCR, and fetch documents from URLs via the Model Context Protocol. 12 tools, 6 formats, zero configuration.

go install github.com/drolosoft/go-docs-mcp@latest
# That's it. Single binary, starts in milliseconds.

For a deeper look at why an MCP server beats a direct tool, see Why MCP?

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🏆 Why Go-Docs MCP?

Every other document MCP server handles one format — a PDF server for PDFs, a DOCX server for DOCX. You'd need three separate servers to read three formats.

	Go-Docs MCP	Others
Single binary, no runtime	Yes	Need Node/Python
go install one-liner	Yes	npm+deps or pip+venv
Multi-format (6 types)	Yes	One format each
Full-text search	Yes	Partial or none
OCR (scanned PDFs + images)	Yes	Rare
Image & table extraction	Yes	Partial
Document outline	Yes	Rare
Fetch from URL	Yes	Rare
Dir-locked, read-only	Yes	Varies
Smart caching	Yes	No
Fully offline	Yes	Yes

Go-Docs MCP reads them all from a single binary — fast, secure, and dependency-free at runtime.

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📋 Features — 12 Tools

Category	Tool	Description
Discovery	list_documents	List all documents with metadata (format, pages, size)
Discovery	list_formats	List supported formats and dependency status
Reading	read_document	Full text, specific page, or page ranges from any format
Reading	read_url	Download from URL and extract text (50MB max)
Reading	get_document_summary	First 3 pages as a quick overview
Search	search_document	Case-insensitive full-text search with context
Analysis	get_document_metadata	Title, author, dates, version, page count
Analysis	get_document_outline	Table of contents / bookmarks
Analysis	extract_tables	Tables as structured data
Analysis	extract_images	Images as base64 (max 10 per call)
OCR	ocr_document	Force OCR on scanned/image-based PDFs
OCR	read_image	Extract text from PNG, JPG, TIFF via OCR

Highlights:

• Fast — mtime-based in-memory caching avoids redundant extraction
• Multi-format — PDF, TXT, MD, CSV, DOCX, and images from one server
• OCR — automatic fallback to tesseract for scanned documents
• Secure — directory-locked with path traversal prevention
• Portable — works on macOS and Linux

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📄 Supported Formats

Format	Dependencies	Notes
PDF	poppler (pdftotext, pdfinfo, pdfimages, pdftoppm)	Full support — text, images, metadata, OCR fallback
TXT, MD, CSV	None	Native, zero dependencies
DOCX	pandoc (optional)	Word document extraction
Images (PNG, JPG, TIFF)	tesseract (optional)	OCR text extraction

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📦 Prerequisites

• Go 1.25+ (install)
• poppler — required for PDF support
• tesseract (optional) — enables OCR for scanned docs and images
• pandoc (optional) — enables DOCX support

# macOS
brew install poppler
brew install tesseract        # optional: OCR
brew install pandoc           # optional: DOCX

# Debian/Ubuntu
apt install poppler-utils
apt install tesseract-ocr     # optional: OCR
apt install pandoc            # optional: DOCX

# Fedora/RHEL
dnf install poppler-utils
dnf install tesseract         # optional: OCR
dnf install pandoc            # optional: DOCX

Note: TXT, MD, and CSV work out of the box with zero dependencies. Install only what you need.

---

🚀 Installation

From source

go install github.com/drolosoft/go-docs-mcp@latest

Build locally

git clone https://github.com/drolosoft/go-docs-mcp.git
cd go-docs-mcp
make build      # produces ./go-docs-mcp
make install    # installs to /usr/local/bin/

---

⚙️ Configuration

Go-Docs MCP reads documents from a configured directory. Set DOCS_MCP_DIR to change it:

Variable	Default	Description
DOCS_MCP_DIR	~/.docs-mcp/documents/	Directory containing documents to serve
PDF_MCP_DIR	(legacy alias)	Backward-compatible alias for DOCS_MCP_DIR

Place your documents in the directory and the server finds them automatically. All supported formats are detected.

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💡 Usage

With Claude Code

Add to your .claude/settings.json:

{
  "mcpServers": {
    "docs": {
      "command": "go-docs-mcp",
      "env": {
        "DOCS_MCP_DIR": "/path/to/your/documents"
      }
    }
  }
}

With Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS):

{
  "mcpServers": {
    "docs": {
      "command": "/usr/local/bin/go-docs-mcp",
      "env": {
        "DOCS_MCP_DIR": "/path/to/your/documents"
      }
    }
  }
}

With any MCP client

The server communicates over stdio using JSON-RPC 2.0:

echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | go-docs-mcp

---

📖 Tool Reference

list_documents

Lists all documents in the configured directory with format detection.

Parameters: None

Example output:

[
  {
    "filename": "architecture-guide.pdf",
    "format": "pdf",
    "title": "architecture-guide",
    "pages": 42,
    "size_bytes": 1048576
  },
  {
    "filename": "notes.md",
    "format": "markdown",
    "title": "notes",
    "size_bytes": 4096
  }
]

---

list_formats

Lists all supported document formats and their dependency status.

Parameters: None

---

read_document

Reads the extracted text content of a document. Automatically falls back to OCR if the document is image-based/scanned and pdftotext returns empty text.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to read
page	number	No	Single page number (1-based). Omit for full text.
pages	string	No	Page ranges, e.g. "1-5", "10", "1-3,7,10-12". Overrides page.

Example input:

{
  "filename": "architecture-guide.pdf",
  "pages": "1-3,10-12"
}

---

search_document

Searches within a document for lines matching a query. Returns matches with 2 lines of context and approximate page numbers.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to search
query	string	Yes	Search query (case-insensitive)

Example output:

Found 3 matches for 'microservice' in architecture-guide.pdf:

--- Match 1 (page ~2, line 45) ---
  The system is composed of several
> microservice components that communicate
  via gRPC and message queues.

---

get_document_summary

Returns the text from the first 3 pages of a document as a quick summary.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to summarize

---

get_document_metadata

Returns full document metadata.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to get metadata for

Example output:

{
  "title": "Architecture Guide",
  "author": "Jane Doe",
  "subject": "System Design",
  "creator": "LaTeX",
  "producer": "pdfTeX",
  "creation_date": "Thu May 15 10:30:00 2025",
  "modification_date": "Thu May 15 10:30:00 2025",
  "pages": 42,
  "file_size_bytes": 1048576,
  "pdf_version": "1.5"
}

---

get_document_outline

Extracts the document outline (table of contents / bookmarks) as a structured list.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to extract outline from

---

extract_tables

Extracts tables from a document as structured data.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to extract tables from
page	number	No	Specific page to extract from. Omit for all pages.

---

extract_images

Extracts images from a document as base64-encoded data. Returns up to 10 images per call.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The document filename to extract images from
page	number	No	Specific page to extract from. Omit for all pages.

Example output:

[
  {
    "page": 1,
    "index": 0,
    "format": "jpeg",
    "width": 800,
    "height": 600,
    "data_base64": "/9j/4AAQSkZJRg..."
  }
]

---

read_url

Downloads a document from a URL and extracts its text content. Maximum file size: 50MB.

Parameters:

Name	Type	Required	Description
url	string	Yes	The URL of the document to download and read
pages	string	No	Page ranges to extract, e.g. "1-5". Omit for full text.

Example input:

{
  "url": "https://example.com/report.pdf",
  "pages": "1-3"
}

---

ocr_document

Forces OCR on a PDF document using tesseract. Useful for scanned/image-based PDFs or when pdftotext returns garbled text. Requires tesseract and pdftoppm.

Note: read_document already auto-detects image-based PDFs and falls back to OCR. Use ocr_document when you want to force OCR regardless, or need to specify a non-English language.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The PDF filename to OCR
page	number	No	Specific page to OCR (1-based). Omit for all pages.
language	string	No	Tesseract language code (default: eng). Use spa, fra, etc.

Example input:

{
  "filename": "scanned-contract.pdf",
  "page": 1,
  "language": "spa"
}

---

read_image

Extracts text from an image file using OCR. Supports PNG, JPG, and TIFF. Requires tesseract.

Parameters:

Name	Type	Required	Description
filename	string	Yes	The image filename to read (PNG, JPG, TIFF)
language	string	No	Tesseract language code (default: eng).

Example input:

{
  "filename": "receipt.png",
  "language": "eng"
}

---

🔒 Security

• Directory-locked — only files within DOCS_MCP_DIR are accessible
• Path traversal prevention — filenames sanitized; ../ rejected
• Extension filter — only supported formats served
• Read-only — no write operations
• URL downloads — 50MB limit, Content-Type validated, temp files cleaned immediately

---

🛠️ Development

make build     # Build the binary
make test      # Run tests with race detector
make clean     # Remove build artifacts

Project structure

go-docs-mcp/
  main.go              # MCP server setup, 12 tool registrations
  internal/
    pdf/
      reader.go        # Document extraction, caching, search, metadata, images, OCR
  Makefile             # Build targets
  go.mod               # Module definition

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📄 License

MIT - Copyright 2026 Drolosoft

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💛 Support

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