Gobstopper

Gobstopper is a local command-line tool that reduces the size of long coding sessions by summarizing older conversation turns while preserving recent work and system prompts. It works as a proxy between coding agents like Claude Code, Codex, Aider, and Goose and their model providers, automatically compacting requests that exceed a token threshold. Users can also preview and create smaller copies of saved sessions while keeping originals in a local vault for recovery.

Designed for developers using AI coding assistants, Gobstopper aims to lower token usage without sacrificing task completion. The tool runs entirely on your machine with no account required, uses rule-based summarization without extra model calls, and is built in Rust. Benchmarks show it reduced input tokens by 29% on one test run while maintaining similar task resolution rates.