far（远）

📄 /far - File-Augmented Retrieval

"Making Every File Readable to Coding Agents via Persistent.meta Sidecars"

FAR is a file augmentation protocol that generates persistent .meta sidecar files for binary documents (PDF, DOCX, XLSX, PPTX, Images, etc.). This allows AI coding agents (like OpenClaw, Cursor, GitHub Copilot) to "read" non-text files directly from the file system without requiring external RAG infrastructure.

Current Version: 1.0.0 Author: Kelly Peilin Chan

🚀 The Problem: AI "Blindness"

AI agents operating in a repository can read code (.py, .js, .md), but they are blind to 30-40% of critical context stored in binary formats:

• Product Specs: requirements.docx
• Design Mocks: architecture.png
• Financial Data: budget.xlsx
• Contracts: agreement.pdf

When an agent encounters budget.xlsx, it sees opaque bytes. It cannot reason about the content.

💡 The Solution: Persistent Sidecars

FAR solves this by generating a human-readable and machine-readable .meta file next to every binary file.

Example:

project/
├── budget.xlsx         (Binary, opaque)
└── budget.xlsx.meta    (Markdown, readable)

The agent simply reads budget.xlsx.meta to understand the spreadsheet. No vector database, no API calls, no runtime overhead.

✨ Features

1. Broad Format Support

FAR extracts text and structure from a wide range of formats:

• 📄 PDF (.pdf): Full text extraction with layout preservation. OCR fallback for scanned PDFs. Embedded image extraction (pdfimages + OCR/Vision).
• 📝 Word (.docx, .doc): Text extraction.
• 📊 Excel (.xlsx): Sheet data converted to Markdown tables.
• 📽️ PowerPoint (.pptx): Slide text extraction.
• 🖼️ Images (.png, .jpg, .jpeg, .gif, .bmp, .webp): OCR (Tesseract) + Apple Vision (on-device, macOS) + AI Vision (GPT-4o) if configured.
• 🎬 Media (.mp4, .mov, .mp3, .wav, .m4a, .flac): Technical metadata (FFprobe) + Apple Vision video-frame analysis (macOS) + AI Transcription (Whisper) if configured.
• 📋 CSV (.csv): Data rendered as Markdown tables (up to 100 rows).
• 📓 Jupyter Notebook (.ipynb): Markdown cells, code cells, and outputs.
• 📚 EPUB (.epub): Full text extracted from all chapters in spine order.
• 📦 Tar (.tar, .tar.gz, .tgz, .bz2, .xz): File listing with sizes.
• 📧 Email (.eml, .msg): Headers, body text, and attachment list.
• 📝 RTF (.rtf): Plain text extraction via control word stripping.
• 🗄️ SQLite (.db, .sqlite, .sqlite3): Table schemas + latest 20 rows per table as Markdown tables.
• 📊 Parquet (.parquet): Schema and row count via pyarrow (optional). *[Metadata only]*
• 🎨 Design (.fig, .sketch, .xd): File size and page/canvas count. *[Metadata only]*
• 💻 Code/Text (.py, .js, .ts, .go, .rs, .md, .json,...): Direct content mirroring.

2. Intelligent Caching (Incremental Build)

FAR is designed for speed. It uses a two-layer caching mechanism:

1. Fast Check (mtime & size): If the file hasn't been modified, it skips processing instantly (0.003s).
2. Content Check (SHA256): If mtime changed, it calculates the file hash. If the content is identical, it updates the timestamp but skips re-extraction.

For directory summaries, FAR also avoids noisy rewrites: if .dir.meta summary content is unchanged, it keeps the file untouched (no extracted_at churn).

3. Directory Summaries (.dir.meta)

FAR generates a .dir.meta file in every directory, providing a high-level summary of all files within. This allows agents to "browse" a folder and understand its contents without reading every single file.

4. Git LFS Support

FAR automatically handles Git LFS pointer files. It will attempt to pull the real content before processing, ensuring you don't get empty metadata for LFS-tracked files.

🛠️ Usage

Installation

The skill is pre-installed in the OpenClaw workspace:

~/.openclaw/workspace/.agents/skills/far/far_gen.py

A symlink is available as far:

far [directory_or_file]

Commands

Scan current directory (Recursive):

far

Scan specific directory:

far ~/Documents/projects/files

Process single file:

far report.pdf

Force regeneration (Ignore cache):

far . --force

Configuration (AI Features)

To enable AI features (Audio Transcription, Image Description), create a .env file in the skill directory or your home folder ~/.far.env. Copy .env.example as a template:

OPENAI_API_KEY=sk-your-key-here
# Optional
OPENAI_BASE_URL=https://api.openai.com/v1
# Optional (macOS default: enabled)
FAR_USE_APPLE_VISION=1
# Optional (macOS default: enabled)
FAR_USE_MACOS_METADATA=1
# Optional tuning
FAR_APPLE_VISION_TIMEOUT=25
FAR_APPLE_VISION_MAX_FRAMES=6

If API keys are missing, FAR gracefully falls back to local tools (Tesseract, FFprobe), and on macOS it also uses Apple Vision + Spotlight metadata on-device by default.

Configuration (Ignore)

Create a .farignore file in your project root to exclude files or directories from scanning.

# .farignore
node_modules
.git
secrets/
*.tmp

🤖 Agent Integration

Add one rule to AGENTS.md or your system prompt:

## File Reading with FAR

When navigating a directory, first read `.dir.meta` for a high-level overview
before opening individual files.

When you encounter a binary file you cannot read directly
(.png, .pdf, .xlsx, .mp4, .fig, .db, etc.), check for a .meta file
beside it — it contains the extracted content as Markdown.

Navigation strategy:
1. Read <dir>/.dir.meta to understand directory structure
2. Read <file>.meta to access binary file content
3. Fall back to reading the source file only if no .meta exists

🏗️ Protocol Specification (v1)

Each .meta file follows a strict format with a YAML frontmatter header and Markdown body.

--far_version: 1
source:
  sha256: 5a1cc2b8d...
  mime: application/pdf
  size: 129509
  mtime: 1708845210.5
extract:
  pipeline: far_gen_v14
  extracted_at: 2026-02-27T10:00:00Z
  deterministic: true
layout:
  pages: 24
---
# filename.pdf

[Extracted Content Here...]

Cache invalidation: a .meta is stale if sha256 or pipeline version has changed.

🤝 Contributing

Roadmap:

• PDF/Word/Excel/PowerPoint Support
• Incremental Caching (SHA-256 + mtime)
• Directory Summaries (.dir.meta)
• OCR for Images/Scanned PDFs (Tesseract)
• Media Metadata (FFprobe) + Transcription (Whisper)
• AI Vision for Images (GPT-4o)
• Apple Vision for Images (on-device, macOS)
• Apple Vision for Video Frames (on-device labels/OCR/faces/barcodes/pose)
• Apple Vision Feature Print fingerprint (on-device embedding hash)
• macOS Spotlight metadata enrichment (mdls)
• PDF Embedded Image Extraction
• CSV → Markdown Tables
• Jupyter Notebook Support
• EPUB, ZIP/TAR, Email, RTF
• SQLite Schema + Data Preview
• Parquet Schema, Design File Metadata
• Pipeline version stale detection
• Layout frontmatter (pages/sheets/slides)
• Full glob support in .farignore
• MCP resource server integration
• PII redaction rules
• Rust implementation for CI/CD speed