ARC Web

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Weekly updates on what we're building at Arc Web

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The problem

What's broken without this

🪙

LLM token costs spiral

Sending full codebases and context to Claude multiplies API costs exponentially, especially for agents making repeated calls.

🔍

Wrong model for task

Teams waste money running expensive models on simple tasks, or undershoot capability on complex reasoning work.

⏱️

Manual CRM integration

Building GoHighLevel workflows requires stitching together fragmented APIs and custom code for each new automation.

The difference

Why it matters

✗ Without

Manual work

Slow iteration

Repeated mistakes

✓ With this

Reduces LLM token spend by 89-99% vs. sending full repo context

Works as both shell hook and MCP server — integrates into existing Claude workflows without rewrites

Rust-based performance means context filtering completes in milliseconds, not seconds

Under the hood

How it works

📥

Shell command or MCP request

User runs a command or Claude makes an MCP call that would normally require full repo context.

⚙️

Hybrid filtering + ranking

lean-ctx analyzes file dependencies, call graphs, and semantic relevance to extract only 1-11% of original context needed.

📤

Minimal context payload

Claude receives stripped context that cuts token usage 89-99% while preserving task-critical information.

What it does

Core capabilities

⚡

Fast

Optimized for speed and efficiency.

🎯

Reliable

Built to work consistently.

🔌

Integrates

Works with your existing tools.

We built lean-ctx because watching agents re-read the same 50MB codebase on every API call was bleeding our token budget dry.

arc-web/activity

Codebase

Built with care

💻

JavaScript

Built in JavaScript for type safety and reliability.

🏗️

Architecture

MCP Server

📦

Key deps

Markdown, GitHub

🔓

Open Source (MIT / PolyForm)

Fork it, extend it, ship it. It's yours.

Built by

Mike Ensor
Arc Web

AI automation, marketing technology, building tools that work.

Mike builds open-source AI tools for agencies, marketers, and operators who are done waiting for software to catch up. All Arc Web projects are open source by default — fork them, extend them, ship them.

ActivityJavaScript