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
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