MCP Context Condenser

MCP Context Condenser ⚡

Token-slimming AST code outliner, surgical symbol extractor, and log compressor cutting AI agent context usage and API bills by up to 85%.

Designed for Cursor, Claude Desktop, Cline, and Antigravity. Works seamlessly as an MCP stdio server or standalone terminal CLI.

🛑 The Problem: LLM Context Saturation & Financial Bleed

Feeding entire 1,000–3,000 line source files into Claude 3.7 Sonnet or GPT-4o context windows causes two critical issues:

1. Financial Bleed: Massive prompt token burns ($15–$50+/day on active pair-programming sessions).
2. "Lost in the Middle" Degradation: Drowning models in boilerplate internal implementations increases hallucination rates and degrades adherence to subtle architectural rules.

Most agent interactions only need exported interfaces, type signatures, or one specific helper function.

✨ Superpowers

📊 Live Benchmark

Ingesting a 450-line TypeScript payment gateway service (PaymentGatewayService.ts):

- RAW FULL FILE DUMP:
- Lines: 450 lines
- Token Weight: ~4,820 tokens
- Latency / Cost: High token latency, potential context degradation
- Cost per 100 queries: $1.44 (Sonnet 3.7)

+ MCP CONTEXT CONDENSER (AST SKELETON):
+ Lines: 58 lines
+ Token Weight: ~680 tokens (85.9% reduction)
+ Latency / Cost: Instant TTFT, razor-sharp instruction following
+ Cost per 100 queries: $0.20 (Sonnet 3.7)

🚀 Quickstart Installation

Option 1: Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "context-condenser": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/TO/mcp-context-condenser/dist/index.js"]
    }
  }
}

Option 2: Cursor

Add to your .cursor/mcp.json:

{
  "mcpServers": {
    "context-condenser": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/TO/mcp-context-condenser/dist/index.js"]
    }
  }
}

Option 3: Terminal CLI (Zero Configuration)

Run directly from your terminal:

# Outline an entire file into a compact skeleton
node dist/index.js outline src/services/auth.ts

# Surgically extract a single function or class
node dist/index.js symbol src/services/auth.ts validateToken

# Compress voluminous test or build logs
node dist/index.js log test_output.log

# Check token budget of a file
node dist/index.js budget src/large_file.ts

🛠️ MCP Tool Reference

1. condense_source

• Inputs:
  • sourceCode (string): Raw code to outline.
  • preserveDocstrings (boolean, optional): Whether to preserve JSDoc / TSDoc comments.
• Returns: Condensed outline, line count diff, token reduction percentage.

2. extract_symbol

• Inputs:
  • sourceCode (string): Full source code.
  • symbolName (string): Name of function, class, interface, or type.
• Returns: Extracted symbol with file imports and line numbers.

3. compress_log

• Inputs:
  • rawLog (string): Raw test, compiler, or build output.
• Returns: Isolated failures, root-cause assertion messages, and source code line pointers.

4. token_budget

• Inputs:
  • filePath (string): File path being evaluated.
  • content (string): Raw file content.
• Returns: Estimated tokens, oversized flag, and optimization recommendations.

📦 Zero-Dependency Standalone Build

Unlike standard MCP servers with hundreds of nested node_modules, mcp-context-condenser is pre-bundled with esbuild into a single, self-contained standalone binary (dist/index.js).

• Instant Startup: $< 10\text{ms}$ process boot time.
• Firecracker & Docker Ready: Zero runtime installation required.

📄 License & Commercial Distribution

Released under the MIT License. Available on:

• Gumroad: Buy or PWYW ($5.00+)
• itch.io: Download on itch.io