zlog — Multi-Agent Session Log Storage Optimizer

The universal zero-config log compressor for AI agent developers. Reclaim 77% to 99.9% SSD space across Cursor, Claude Code, Antigravity, Ollama & Windsurf while keeping 100% of conversation transcripts intact.

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🚀 Quick Install (1-Line)

via skills.sh Package Manager

npx skills add sebin-gg/zlog

via Universal Shell Script

curl -fsSL https://raw.githubusercontent.com/sebin-gg/zlog/main/install.sh | bash

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⚡ Key Highlights

• 99.9% Storage Reclamation: Uses zstd -15 (or xz -9 / gzip) to shrink 500MB logs down to 4KB.
• 0-Byte Log Purging: Cleans dead empty files automatically.
• Process Lock Safe: Checks kernel locks via fuser -s (Linux/WSL), lsof (macOS), or [System.IO.File]::Open (Windows 11). Never corrupts running agents.
• Memory Context Intact: Excludes transcript.jsonl files. Zero context loss for AI agents.
• Single-Line Output: Condenses multi-folder scan results into one clean line (253M total).
• Cross-Platform Parity: Runs natively on Linux, macOS, WSL, and Windows 11 PowerShell.
• Junk-Pruned Hybrid Deep Scan: Never descends into Caches/node_modules/GPU-cache junk; capped at depth 12 — fast, future-proof, bounded.

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📊 Benchmark & Storage Savings

Compression Algorithm	27 MB Raw Agent Log	Storage Saved	Compression Ratio	CPU Overhead
Raw Uncompressed	27.08 MB	0%	1.0x	None
Standard Gzip (.gz)	0.12 MB	99.6%	225x	Fast
Zstandard (zstd -15)	0.0048 MB (4.8 KB)	99.98%	5,641x	Ultra-Fast
LZMA2 (xz -9)	0.0032 MB (3.2 KB)	99.99%	8,462x	Moderate

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🏗️ How It Works

graph TD
    A["Wrap-up Prompt / Trigger"] --> B{"Scan AI Agent Paths"}
    B --> C["~/.gemini, ~/.config/Cursor, ~/.ollama, ~/.claude, etc."]
    C --> D{"Process Lock Check"}
    D -- "fuser / lsof / System.IO detects active PID" --> E["Skip File - In-Flight Safety"]
    D -- "No active process lock" --> F{"File & Window Filters"}
    F -- "*.jsonl / SKILL.md / README* / <10KB / <60s old" --> G["Skip File - Protected"]
    F -- "*.log / *.out / *.txt / *.trace" --> H["zstd -15 / xz -9 / gzip -f"]
    H --> I["Report Savings + Total (e.g. Compressed 15 files: 34M -> 8M)"]

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🌐 Supported AI Agent Runtimes

#	AI Agent / IDE	Default Log Directory	OS Parity
1	Antigravity CLI	~/.gemini/antigravity-cli/logs/	Linux, macOS, Windows 11
2	Gemini CLI	~/.gemini/	Linux, macOS, Windows 11
3	Cursor IDE	~/.config/Cursor/	Linux, macOS, Windows 11
4	Cursor (Legacy)	~/.cursor/	Linux, macOS, Windows 11
5	Claude Code	~/.claude/	Linux, macOS, Windows 11
6	Claude Code Config	~/.config/claude-code/	Linux, macOS, Windows 11
7	Ollama	~/.ollama/	Linux, macOS, Windows 11
8	Windsurf	~/.windsurf/	Linux, macOS, Windows 11
9	Codex CLI	~/.codex/	Linux, macOS, Windows 11
10	LM Studio	~/.cache/lm-studio/	Linux, macOS, Windows 11

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💻 One-Line Command Snippets

POSIX Shell (Linux, macOS, WSL, Git Bash)

raw=0; saved=0; count=0
for d in ~/.gemini ~/.config/Cursor ~/.cursor ~/.ollama ~/.claude ~/.config/claude-code ~/.windsurf ~/.codex ~/.cache/lm-studio; do
  [ -d "$d" ] || continue
  find -L "$d" \( -name "*.log" -o -name "*.out" -o -name "*.trace" -o -name "*.txt" \) -empty -type f -delete 2>/dev/null || true
  while IFS= read -r f; do
    [ -z "$f" ] && continue
    size=$(stat -c%s "$f" 2>/dev/null || stat -f%z "$f" 2>/dev/null) || size=0
    (command -v fuser >/dev/null 2>&1 && fuser -s "$f" 2>/dev/null) || (command -v lsof >/dev/null 2>&1 && lsof "$f" >/dev/null 2>&1) || (command -v zstd >/dev/null 2>&1 && zstd -15 -q --rm "$f") || (command -v xz >/dev/null 2>&1 && xz -9 "$f") || gzip -f "$f"
    for c in zst xz gz; do
      [ -f "$f.$c" ] || continue
      newsize=$(stat -c%s "$f.$c" 2>/dev/null || stat -f%z "$f.$c" 2>/dev/null) || newsize=0
      raw=$((raw + size)); saved=$((saved + size - newsize)); count=$((count + 1))
      break
    done
  done < <(find -L "$d" \( -type d \( -name node_modules -o -name Caches -o -name Cache -o -name "Code Cache" -o -name blob_storage -o -name GPUCache -o -name DawnGraphiteCache -o -name DawnWebGPUCache \) -prune \) -o \( -type f \( -name "*.log" -o -name "*.out" -o -name "*.trace" -o -name "*.txt" \) -not -name "*.gz" -not -name "*.zst" -not -name "*.xz" -not -name "*.jsonl" -not -name "SKILL.md" -not -iname "README*" -not -iname "LICENSE*" -size +10k -mmin +1 \) 2>/dev/null)
done
if [ "$count" -gt 0 ]; then
  comp=$((raw - saved))
  raw_h=$(numfmt --to=iec "$raw" 2>/dev/null || echo "${raw}B")
  comp_h=$(numfmt --to=iec "$comp" 2>/dev/null || echo "${comp}B")
  saved_h=$(numfmt --to=iec "$saved" 2>/dev/null || echo "${saved}B")
  echo "[zlog] Compressed $count files: $raw_h -> $comp_h (saved $saved_h, $(( saved * 100 / raw ))% smaller)"
fi
dirs=(); for d in ~/.gemini ~/.config/Cursor ~/.cursor ~/.ollama ~/.claude ~/.config/claude-code ~/.windsurf ~/.codex ~/.cache/lm-studio; do [ -d "$d" ] && [ ! -L "$d" ] && dirs+=("$d"); done; [ ${#dirs[@]} -gt 0 ] && du -ch "${dirs[@]}" 2>/dev/null | tail -n 1 || true

Windows 11 Native PowerShell

Get-ChildItem -Path "$env:USERPROFILE\.gemini","$env:USERPROFILE\.cursor","$env:USERPROFILE\.ollama","$env:USERPROFILE\.claude","$env:USERPROFILE\.windsurf","$env:USERPROFILE\.codex" -Recurse -Include *.log,*.out,*.txt,*.trace -Exclude *.gz,*.zst,*.xz,*.jsonl,SKILL.md,README*,LICENSE* -ErrorAction SilentlyContinue | Where-Object { $_.Length -gt 10KB -and $_.LastWriteTime -lt (Get-Date).AddMinutes(-1) -and (try { $s = [System.IO.File]::Open($_.FullName, 'Open', 'ReadWrite', 'None'); $s.Close(); $true } catch { $false }) } | ForEach-Object { tar.exe -czf "$($_.FullName).tar.gz" -C $_.DirectoryName $_.Name; Remove-Item $_.FullName }

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Note: the Windows PowerShell scan recurses unpruned (PowerShell has no -prune); the find-based scans on Linux/macOS/WSL skip junk/cache dirs wholesale.

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❓ FAQ

• Does zlog break chat history?
  No. transcript.jsonl files are strictly excluded. 100% memory retained.

• What if an AI agent is actively writing to a log file?
  Safe. Kernel lock checks (fuser -s / lsof / System.IO.File) & 60s age buffer (-mmin +1) skip active files.

• How do I read or search compressed .zst / .gz logs?

  • Read: zstdcat file.log.zst or zcat file.log.gz
  • Read Windows .tar.gz: tar -xzf file.log.tar.gz
  • Search: zstdgrep "error" file.log.zst or zgrep "error" file.log.gz

• Is zlog safe to run during multi-agent sessions?
  Yes. Concurrent process locks and age filters guarantee safe execution across all running agents.

• How does the deep scan stay fast without missing files?
  Hybrid pruning + depth cap: junk/cache dirs (node_modules, Caches, Code Cache, blob_storage, GPUCache, .git, …) are pruned wholesale, while -maxdepth 12 bounds the walk. Real agent logs — even Antigravity's 8-level nesting — are never missed, and the pruned-dir count is reported.

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🌟 Support Open Source

If zlog saved space on your drive, consider giving it a ⭐ Star on GitHub!

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📄 License

MIT © 2026 Sebin Mathew