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title contextcrawler Documentation
description contextcrawler (Rust Token Killer) — reduce LLM token consumption by 60-90% on common dev commands, with zero workflow changes
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contextcrawler — Rust Token Killer

contextcrawler is a CLI proxy that sits between your AI assistant and your development tools. It filters command output before it reaches the LLM, keeping only what matters and discarding boilerplate, progress bars, and noise.

Result: 60-90% fewer tokens consumed per command, without changing how you work. You run git status as usual — contextcrawler's hook intercepts it, filters the output, and the LLM sees a compact 3-line summary instead of 40 lines.

How it works

Your AI assistant runs:  git status
                              ↓
              Hook intercepts (PreToolUse)
                              ↓
              contextcrawler git status  (transparent rewrite)
                              ↓
     Raw output: 40 lines     →     Filtered: 3 lines
     ~800 tokens              →     ~60 tokens  (92% saved)
                              ↓
              LLM sees the compact output

Zero config changes to your workflow. The hook handles everything automatically.

What contextcrawler optimizes

Dozens of commands across all major ecosystems — Git, Cargo/Rust, JavaScript, Python, Go, Ruby, .NET, Docker/Kubernetes, and more. See What contextcrawler Optimizes for the full list with savings percentages.

Get started

  1. Installation — Install contextcrawler and verify you have the right package
  2. Quick Start — Connect to your AI assistant in 5 minutes
  3. Supported Agents — Claude Code, Cursor, Copilot, Gemini, and more

Measure your savings

contextcrawler gain           # total savings across all sessions
contextcrawler gain --daily   # day-by-day breakdown
contextcrawler gain --weekly  # weekly aggregation

See Token Savings Analytics for export formats and analysis workflows.

Analyze your usage

contextcrawler discover       # find commands that ran without contextcrawler (missed savings)
contextcrawler session        # contextcrawler adoption rate per Claude Code session

See Discover and Session for details.

Further reading