com.yetanotherbrowser/yab
Yab, Yet Another Browser
Your own signed-in Mac browser for any agent: open, read and act in tabs. Local and free.
alive probed 2026-10-19
69tools
≈ 9.4ktokens, estimate
≈ 4.7 %of Claude's 200k window
6.6×the median server
61 msto initialize
7 msto list tools
- Run it
- npx -y yab-mcp@0.2.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- yab-browser 0.2.1
- Capabilities
- tools
- Instructions
- 151 characters
- Of a 1M window
- ≈ 0.9 % of a 1M context window, estimate
- Claude count
- The count_tokens endpoint refused the tool schemas: invalid x-api-key. The estimate stands in.
- Repository
- https://github.com/yetanotherbrowser/yab-mcp
- Website
- https://yetanotherbrowser.com/developers
- Registry
- active, updated 2026-10-12 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| suggest | 548 | 6 % |
| mail_draft | 358 | 4 % |
| run | 318 | 3 % |
| autofill | 305 | 3 % |
| handoff | 282 | 3 % |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- This server is in the heaviest 10 % of the registry. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.
- The Anthropic count_tokens endpoint refused the tool schemas (invalid x-api-key). A client that validates schemas can refuse them too.