Dropzone Zero: A Local Gemma Agent That Files Downloads and Provides Undo

Description and use

Dropzone Zero is a local Gemma 4 agent that automatically classifies, renames, and files downloads, with a safe guard and an exact undo feature.

Problem

Manual sorting of downloads is tedious and error‑prone, leading to missed invoices and cluttered folders.

Outcome

On 63 synthetic test documents, Gemma 4 achieved 98.4% accuracy for document type and 100% accuracy for printed dates, with a median processing time of 3.6 s per file. A LoRA on Qwen3.5‑4B improved date accuracy from 92.1% to 100% over the baseline, but the untuned local Gemma already met the target, so the app retains Gemma.

Workflow

• 1. New download appears in Downloads
• 2. Dropzone Zero checks rules: still downloading, empty, duplicate, temp
• 3. Gemma 4 (local) reads the file and returns strict JSON (kind, printed date, title, confidence)
• 4. Code builds target folder and filename based on rules and JSON
• 5. Guard decides ALLOW, REVIEW (via Zee or phone), or BLOCK
• 6. Harness re‑checks hash, renames, hashes again, and journals the move
• 7. User can undo any move by replaying the journal

Evidence

On 63 synthetic test documents Gemma got the document type right 98.4% of the time and the date right every time, at a median of 3.6 seconds per file.

Source

Gemma 4 reads every file on my laptop, a little robot called Zee shows me what it is doing, and Undo last puts any file back exactly as it was.

Source

The model only proposes. A guard decides (allow, ask, or block) and a harness verifies and journals every move, so undo is exact.

Source