com.mcparmory/browserbase

Browserbase

Is the com.mcparmory/browserbase MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.

Create and control browser sessions for web automation, testing, and AI agent tasks

alive probed 2026-11-14

18tools

3.9ktokens in Claude Opus 5.5

1.9 %of Claude's 200k window

1.5×the median server

9.4 sto initialize

713 msto list tools

Run it: uvx mcparmory-browserbase@1.0.4 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: Browserbase 4.2.0
Capabilities: logging, prompts, resources, tools
Instructions: none
Of a 1M window: 0.4 % of a 1M context window
Count: 3.9k tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 4.0k. The o200k_base estimate is 2.1k. Counted again when the tool definitions change. Method.
Repository: https://github.com/mcparmory/registry
Registry: active, updated 2026-05-11 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.84×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
create_session	1 350	735	35 %
release_session	279	152	7 %
list_sessions	198	108	5 %
upload_session_file	195	106	5 %
upload_extension	158	86	4 %

Other registry entries on pypi.org, the ones next to this name; all of them.

Servers that mention browserbase.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.