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+---
+document_type: "design_doc"
+service: "MOMENTRY_CORE"
+title: "File Probe SOP — Unified Metadata Extraction"
+version: "V1.0"
+date: "2026-05-15"
+author: "M5"
+status: "draft"
+---
+
+# File Probe SOP — Unified Metadata Extraction
+
+| Item | Value |
+|------|-------|
+| Scope | All managed file types (video, image, document, spreadsheet, presentation, archive) |
+| Status | Draft |
+| Key principle | Every file produces a `probe_json` metadata block via a unified procedure |
+
+## Overview
+
+Currently `ffprobe` handles video/image files; non-video files get minimal `fs::metadata()` fallback.
+This SOP defines a unified probe for ALL file types.
+
+## Step 0: File Category Detection (extension → category)
+
+```
+video:      mp4, mov, mkv, avi, webm, m4v, mpeg
+image:      jpg, jpeg, png, gif, bmp, webp, svg, heic, tiff
+document:   pdf, doc, docx, odt, pages, rtf, txt, md
+spreadsheet: xls, xlsx, csv, ods, numbers
+presentation: ppt, pptx, odp, key
+archive:    zip, tar, gz, 7z, rar
+unknown:    everything else
+```
+
+## Step 1: Probe by Category
+
+| Category | Tool | License | Source Build | Phase |
+|----------|------|---------|:-----------:|:----:|
+| video / image | `ffprobe` (macOS built-in) | Apple EULA | ✅ system | 1 |
+| `.pdf` | `PyPDF2` | BSD-3-Clause | ✅ pure Python | 2 |
+| `.docx` | `python-docx` | MIT | ✅ pure Python | 2 |
+| `.xlsx` | `openpyxl` | MIT | ✅ from source | 2 |
+| `.pptx` | `python-pptx` | MIT | ✅ pure Python | 2 |
+| `.pages/.key/.numbers` | `unzip` → `preview.pdf` | Apple EULA | ✅ system | 1 |
+| archive | `unzip -l` / `tar -tvf` | Apple EULA | ✅ system | 1 |
+| unknown | `fs::metadata()` | N/A | ✅ no dep | 1 |
+
+## Step 2: Unified probe_json Format
+
+```json
+{
+  "format": {
+    "filename": "/data/demo/report.docx",
+    "format_name": "docx",
+    "file_type": "document",
+    "size": "245760",
+    "mtime": "2026-05-15T02:15:00Z"
+  },
+  "streams": [],
+  "category_meta": {
+    "pages": 12,
+    "paragraphs": 87,
+    "author": "Warren",
+    "created_at": "2026-03-15T10:00:00Z"
+  }
+}
+```
+
+### Category Metadata Fields
+
+| Category | Fields | Tool |
+|----------|--------|------|
+| video / image | `streams[].codec_type, width, height, fps` | ffprobe |
+| document (pdf) | `pages, author, title, page_size` | PyPDF2 |
+| document (docx) | `paragraphs, author, created_at` | python-docx |
+| spreadsheet | `sheet_names, sheet_count, row_count` | openpyxl |
+| presentation | `slide_count, speaker_notes` | python-pptx |
+| archive | `entry_count, entries: [{name, size}]` | unzip / tar |
+| unknown | (none) | fs::metadata |
+
+## Implementation
+
+### Rust: `src/core/probe/unified.rs`
+
+```rust
+pub enum FileCategory { Video, Image, Document, Spreadsheet, Presentation, Archive, Unknown }
+
+pub fn detect_category(path: &Path) -> FileCategory {
+    let ext = path.extension().and_then(|e| e.to_str()).map(|e| e.to_lowercase());
+    match ext.as_deref() {
+        Some("mp4"|"mov"|"mkv"|"avi"|"webm"|"m4v") => FileCategory::Video,
+        Some("jpg"|"jpeg"|"png"|"gif"|"bmp"|"webp"|"svg") => FileCategory::Image,
+        Some("pdf"|"doc"|"docx"|"odt"|"pages"|"rtf"|"txt"|"md") => FileCategory::Document,
+        Some("xls"|"xlsx"|"csv"|"ods"|"numbers") => FileCategory::Spreadsheet,
+        Some("ppt"|"pptx"|"odp"|"key") => FileCategory::Presentation,
+        Some("zip"|"tar"|"gz"|"7z"|"rar") => FileCategory::Archive,
+        _ => FileCategory::Unknown,
+    }
+}
+
+pub async fn unified_probe(path: &Path, scripts_dir: &str, python_path: &str) -> serde_json::Value {
+    let category = detect_category(path);
+    let format_base = base_format_info(path);
+
+    match category {
+        FileCategory::Video | FileCategory::Image => {
+            ffprobe_probe(path, format_base)
+        }
+        FileCategory::Document | FileCategory::Spreadsheet | FileCategory::Presentation => {
+            python_probe(path, category, scripts_dir, python_path, format_base)
+        }
+        _ => minimal_probe(path, format_base),
+    }
+}
+```
+
+### Python: `scripts/probe_file.py`
+
+```python
+#!/opt/homebrew/bin/python3.11
+"""Unified file probe dispatcher."""
+import sys, json, os
+
+def probe(path):
+    ext = os.path.splitext(path)[1].lower()
+    result = {"streams": []}
+    if ext == '.pdf':
+        from PyPDF2 import PdfReader
+        r = PdfReader(path)
+        result["category_meta"] = {
+            "pages": len(r.pages),
+            "author": r.metadata.get('/Author', '') if r.metadata else '',
+        }
+    elif ext in ('.docx',):
+        from docx import Document
+        d = Document(path)
+        result["category_meta"] = {
+            "paragraphs": len(d.paragraphs),
+            "author": d.core_properties.author or '',
+        }
+    elif ext in ('.xlsx',):
+        import openpyxl
+        wb = openpyxl.load_workbook(path, read_only=True)
+        result["category_meta"] = {
+            "sheet_names": wb.sheetnames,
+            "sheet_count": len(wb.sheetnames),
+        }
+    elif ext in ('.pptx',):
+        from pptx import Presentation
+        prs = Presentation(path)
+        result["category_meta"] = {"slide_count": len(prs.slides)}
+    return json.dumps(result)
+
+if __name__ == '__main__':
+    print(probe(sys.argv[1]))
+```
+
+### Integration Points
+
+| File | Change |
+|------|--------|
+| `src/core/probe/unified.rs` | **New** — unified probe dispatcher |
+| `src/core/probe/mod.rs` | Add `pub mod unified;` |
+| `scripts/probe_file.py` | **New** — Python probe per category |
+| `src/api/server.rs` | Step 5: replace `probe_video()` with `unified_probe()` |
+| `src/watcher/watcher.rs` | `pre_process_file()` uses `unified_probe()` |
+
+### Dependencies
+
+```bash
+pip3 install PyPDF2 python-docx openpyxl python-pptx
+```
+
+| Package | Version | License | Dependencies |
+|---------|---------|---------|-------------|
+| `PyPDF2` | 3.0.1+ | BSD-3-Clause | pure Python |
+| `python-docx` | 1.2.0+ | MIT | pure Python |
+| `openpyxl` | 3.1.5+ | MIT | + Pillow + et_xmlfile |
+| `python-pptx` | 1.0.2+ | MIT | + lxml + Pillow + XlsxWriter |
+
+All verified to build from source (`--no-binary :all:`). All dependencies are MIT/BSD/Apache-2.0 licensed — no GPL dependency chain.
+
+## Phase Plan
+
+| Phase | Tools | Install | Status |
+|-------|-------|---------|--------|
+| 1 | `fs::metadata()` fallback | Built-in | ✅ Done |
+| 2 | Python packages (PyPDF2, docx, openpyxl, pptx) | `pip3 install` | ⬜ Ready |
+| 3 | `pdfinfo` (poppler), `libreoffice` (optional) | `brew install` | ⬜ Optional |
+
+## Version History
+
+| Version | Date | Changes |
+|---------|------|---------|
+| V1.0 | 2026-05-15 | Initial — unified probe SOP for all file types |