Dev Tools
toon
TOON: a compact, human-readable serialization of JSON that saves tokens in LLM prompts
★ 25.5k starsMIT
View guide →Compress tool outputs, logs and RAG chunks before they reach the LLM — same answers, fewer tokens
headroom is an open-source dev tools project by headroomlabs-ai (headroomlabs-ai/headroom on GitHub). It has 74,736 GitHub stars and 5,785 forks, is released under the Apache-2.0 license, and was last updated on GitHub on 8 October 2026.
Decide what you want from headroom and check the README and requirements to confirm it fits your setup and Python environment.
Clone the repository from GitHub (github.com/headroomlabs-ai/headroom) or use the documented install channel if you do not need the source.
Follow the README quickstart to install dependencies and set any required configuration or credentials.
Work through the README's first example end to end, then adapt it to your own project or data.
Compresses tool outputs, logs, files and RAG chunks before they enter the context window.
The project reports 60-95% fewer tokens for JSON payloads while keeping answers the same.
Usable as a Python/TypeScript library, a proxy, or an MCP server.
Works with coding agents such as Claude Code and Cursor and frameworks like LangChain.
`headroom learn` adapts compression to your workload, per the README.
The proxy is built on FastAPI for easy self-hosting.
Start by getting the source and entering the project directory.
git clone https://github.com/headroomlabs-ai/headroom.git
cd headroomThe README recommends a uv tool install for the CLI, or pip for the Python package.
pip install "headroom-ai[all]"Start the proxy or MCP server and point your agent at it, per the 60-second get-started guide.
headroom # see README for the exact commandIt is maintained by headroomlabs-ai and contributors on GitHub, where the repository github.com/headroomlabs-ai/headroom is the canonical home for code, issues and releases.
Yes — it is open source under the Apache-2.0 license. Read the license in the repository for what is permitted, including any conditions on redistribution or commercial use.
No key of its own — it sits in front of your existing LLM provider, which still uses your own key.
Compared with manual context pruning: Headroom compresses content automatically as a proxy or MCP server instead of developers hand-trimming every payload.
Clone github.com/headroomlabs-ai/headroom, follow the README quickstart to install it, and run the documented first example before adapting it to your own work.
TOON: a compact, human-readable serialization of JSON that saves tokens in LLM prompts
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