io.github.Koala-Studios/newton-browser
newton-browser
Local-only Chrome and Edge control for MCP clients through an origin-scoped extension.
alive probed 2026-10-15
11tools
2.1ktokens in Claude Opus 5.5
2.2ktokens in Claude Code
1.0 %of a 200k context window
1.0ko200k_base estimate
238 msto initialize
7 msto list tools
- Run it
- npx -y newton-browser@0.4.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- newton-browser 0.4.1
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-15. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/Koala-Studios/newton-browser
- Registry
- active, updated 2026-07-12 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| browser.screenshot | 178 | 17 % |
| browser.console | 129 | 12 % |
| browser.session.start | 117 | 11 % |
| browser.network | 116 | 11 % |
| browser.observe | 111 | 11 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.Koala-Studios/newton-browser)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.