io.github.masakaai/jet-browser
Jet Browser Verifier
Is the Jet Browser Verifier MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.
Verify an isolated WPE WebKit runtime with native-input, DOM, PNG, and cleanup evidence.
alive probed 2026-11-14 · unchanged since 2026-10-31
- Run it
- docker run -i --rm ghcr.io/masakaai/jet-browser-mcp:0.9.0 (stdio, probed in a container with the network off)
- Host
- ghcr.io
- Reports itself as
- jet-browser-verifier 0.9.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- <0.1 % of a 1M context window
- Count
- 237 tokens in Claude Opus 5.5, exact, measured 2026-10-31. With the Claude Code prefix mcp__…__ on each tool name: 257. The o200k_base estimate is 121. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/masakaai/jet-browser
- Website
- https://masaka-ai.vercel.app/jet-browser/
- Registry
- active, updated 2026-10-11 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.96×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| jet_browser_verify | 123 | 63 | 52 % |
| jet_browser_capabilities | 114 | 58 | 48 % |
Compare this server with others.
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Other registry entries on ghcr.io, the ones next to this name; all of them.
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- mqb · mq-bridge io.github.marcomq/mq-bridge · alive
- mq-bridge-app io.github.marcomq/mq-bridge-app · alive
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- lockvet io.github.matteo-sung/lockvet · alive
- shortfree io.github.maximilianfeix/shortfree · alive
- Obsidian MCP Server io.github.maxkuminov/obsidian-mcp · not probed
- Portunus io.github.mdostal/portunus · alive
Servers that mention browser.
- ai.foura/mcp · alive
- ai.kaiv/can-i-use · alive
- NativePort ai.nativeport/mcp · needs auth
- ai.openhelm/openhelm · needs auth
- PlayDrop ai.playdrop/mcp · needs auth
- Qlane ai.qlane/qlane · needs auth
- Reduck ai.reduck/reduck · needs auth
- ai.smithery/ImRonAI-mcp-server-browserbase · not found
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
- The server answers initialize and tools/list. Nothing to fix.