ContextOS CLI cuts AI agent context waste by 87% with offline ranking

ContextOS is a local CLI tool that selects only relevant files for AI coding agents, reducing token usage by up to 87%. It ranks files using five signals including import graph centrality and AST symbol overlap, with no cloud or LLM calls. The open-source tool supports Claude, Codex, Cursor, and Aider, and includes an MCP server for direct tool integration.