mcp-compress

The first MCP server for data compression. Gives any AI agent the ability to compress, decompress, analyze, and store data.

10,000+ MCP servers exist. Zero for compression. This is the first.

Zero dependencies. Pure Node.js. Lossless round-trip. Auto-picks the best algorithm.

Benchmarks

Real results on real data types:

| Data Type | Original | Compressed | Ratio | Saved | |-----------|----------|------------|-------|-------| | Markdown docs (15KB) | 31.2 KB | 0.5 KB | 60.7x | 98.4% | | Repeated config (2KB) | 5.4 KB | 0.1 KB | 51.9x | 98.1% | | SQL query results (8KB) | 18.9 KB | 0.6 KB | 30.4x | 96.7% | | Log files (20KB) | 33.3 KB | 1.7 KB | 19.9x | 95.0% | | JSON API response (10KB) | 26.7 KB | 2.6 KB | 10.2x | 90.2% | | Time-series prices (4KB) | 20.5 KB | 3.0 KB | 6.9x | 85.5% | | CSV data (5KB) | 8.1 KB | 2.4 KB | 3.4x | 70.5% |

Every compression is lossless — decompress returns the exact original, byte-for-byte.

Install

Claude Code

Add to ~/.claude/settings.json:

{
  "mcpServers": {
    "compress": {
      "command": "npx",
      "args": ["-y", "mcp-compress"]
    }
  }
}

OpenClaw / Any MCP Client

npx mcp-compress

Speaks MCP protocol over stdio. Works with any MCP-compatible AI agent.

From Source

git clone https://github.com/ShipItAndPray/mcp-compress.git
cd mcp-compress
node index.js

Tools

7 tools available to any connected agent:

| Tool | What it does | |------|-------------| | compress | Compress text/JSON/CSV. Auto-picks best algorithm (gzip, brotli, deflate). Returns base64 + ratio. | | decompress | Decompress back to original. Lossless round-trip verified. | | analyze | Shannon entropy, compressibility rating, all algorithms compared, recommendation. | | store | Compress and persist to disk with a key. Compressed key-value store for agents. | | retrieve | Decompress and return stored data by key. | | list | List all stored items with sizes and compression ratios. | | stats | Total items stored, bytes saved, overall compression ratio. |

Usage Examples

Compress a large API response: `` compress(data: "<10KB JSON>", algorithm: "auto") → { ratio: "10.2x", saved_percent: "90.2%", algorithm: "brotli" } ``

Analyze before compressing: `` analyze(data: "<your data>") → { compressibility: "HIGH", best_ratio: "30.4x", recommendation: "compress everything" } ``

Store data for later retrieval: ``` store(data: "<research notes>", name: "market-analysis") → { key: "market-analysis", ratio: "8.3x", saved: "12,450 bytes" }

retrieve(key: "market-analysis") → { data: "<original research notes>" } ```

Check what you've stored: `` stats() → { stored_items: 14, total_saved_bytes: 284102, overall_ratio: "11.2x" } ``

Why This Exists

• AI agents generate and consume massive amounts of text — API responses, code, docs, data
• Context windows are expensive. Compressed storage = more data in less space = lower cost.
• MCP is the standard protocol for AI agent tools. 10,000+ servers, none for compression.
• Auto-algorithm selection means the agent doesn't need to know anything about compression — it just works.

How It Works

1. Auto-algorithm selection — tests gzip, brotli, and deflate on your data, picks the smallest result
2. Brotli wins 90% of the time — purpose-built for text, consistently 20-40% smaller than gzip
3. Compressed key-value store — store/retrieve gives agents persistent compressed storage at ~/.mcp-compress/
4. Shannon entropy analysis — analyze tells you if compression is even worth it before you do it

Test Results

10/10 evals passing:
  ✓ Initialize returns protocol version
  ✓ Lists all 7 tools
  ✓ Compress returns valid base64 and ratio > 1x
  ✓ Round-trip is lossless
  ✓ Analyze returns compressibility recommendation
  ✓ Store and retrieve preserves data
  ✓ Stats returns valid counts
  ✓ List shows stored items
  ✓ Auto picks smallest algorithm
  ✓ Handles 100KB+ data

License

MIT