context-os: Open-source tool reduces Claude Code token consumption by 27-42%
context-os is an open-source local context optimizer that hooks into Claude Code automatically to reduce token consumption. The tool was created after hitting usage limits too frequently.
Setup and installation
One command setup: cargo install --path apps/cli followed by context-os init.
Features
- PreToolUse hook intercepts cargo test, npm build, cargo clippy, pytest, and similar commands, compressing the output before Claude sees it
- Auto-saves session state when you stop — next session loads your objective, git state, modified files, decisions, and failed approaches
- Injects compact context (branch, uncommitted files, objective) on every turn so Claude always knows where it is, even after compaction
Performance and specifications
- 27-42% reduction in token consumption depending on content type
- 7/7 gates passing in benchmarks
- 100% protected string recall
- Single Rust binary
- No cloud, no network calls
The tool won't fix the rate limit system itself, but it measurably reduces how many tokens you burn per session on bloated tool output.
📖 Read the full source: r/ClaudeAI
👀 See Also
TruthGuard: Shell Script Hooks That Catch AI Coding Agent Lies
TruthGuard is an open-source tool that uses shell script hooks to verify what Claude Code and Gemini CLI actually do versus what they claim. It catches phantom edits, exit code lies, dangerous shortcuts, and blocks commits when tests fail.
ai-codex: Pre-index your codebase to save Claude tokens
ai-codex is a tool that generates compact markdown indexes of your codebase, allowing Claude Code to skip the initial exploration phase that typically consumes 30-50K tokens per conversation. It creates five files covering routes, pages, libraries, schemas, and components.
Introducing Swarmcore: A Scalable Multi-Agent Framework in Python
Swarmcore is an open-source library for running scalable multi-agent workflows in Python, featuring sequential or parallel execution and expandable context management.
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