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:

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:

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