An independent AI lab
Agents you can rely on,built in the open.
Halley is where we build our flagships and share the tools behind them, most of it open source, with the numbers that show it works.
We are a small lab of engineers who build agents for real work: voice agents that answer phones, tools that keep coding agents inside the lines, recorders that make every model call replayable. When something we build is good, we give it away. When it is our best, it becomes a flagship.
Flagship · In development
An operating system for AI at work.
One place where a team's agents talk, listen and act, across chat and voice, with the tools the team already uses.
- 01Chat and voice, with one memory of the person across both.
- 02Workflows you can read, test and roll back.
- 03Small task-specific models for the routine steps.
- 04Integrations, so agents act instead of only talking.
From the bench
The latest releases.
- sheetstreamv0.3.0Read and write million-row XLSX and CSV files in Node.js in about 80 MB of memory
- purify-edgev0.1.2DOMPurify without jsdom: identical output, 4x faster, runs on Cloudflare Workers
- faultlinev0.5.1A live architecture map that stops agents crossing the boundaries you drew
- Tringv0.4.1Write a voice agent once in YAML and run it on any speech architecture
- witnessv0.3.0A recording cache for model APIs that cuts inference spend and resumes crashed runs
We build the tools we need to make agents dependable, and we give most of them away.
Open source
Fourteen projects, one bench.
faultline
A live architecture map that stops agents crossing the boundaries you drew
Tring
Write a voice agent once in YAML and run it on any speech architecture
witness
A recording cache for model APIs that cuts inference spend and resumes crashed runs
Quicky Wiki
Turn a pile of documents into a knowledge base that scores how sure it is
fasthands
Computer use that sends diffs, not screenshots: 91% fewer tokens, any model as the brain
samemark
The same mdast as remark-parse, up to 10x faster, with streaming for chat UIs
The people
Friends who build together, with room for more.
There are no ranks at Halley. Everyone here is a collaborator, and every project carries the names of the people who made it. If you want to build a flagship or keep an open-source project alive with us, there is a seal waiting for you.
Build with us