io.github.pubnub/mcp-server

PubNub MCP Server

Is the PubNub MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

PubNub Model Context Protocol MCP Server for Cursor and Claude

alive probed 2026-11-14 · unchanged since 2026-10-30

12tools

16ktokens in Claude Opus 5.5

8.2 %of Claude's 200k window

6.5×the median server

763 msto initialize

22 msto list tools

Run it: npx -y @pubnub/mcp@2.3.2 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: pubnub-mcp 2.3.2
Capabilities: completions, prompts, resources, tools
Instructions: 524 characters
Of a 1M window: 1.6 % of a 1M context window
Count: 16k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 17k. The o200k_base estimate is 9.1k. Counted again when the tool definitions change. Method.
Repository: https://github.com/pubnub/pubnub-mcp-server
Website: https://www.pubnub.com/networking-mcp-server
Registry: active, updated 2026-03-16 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.81×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
manage_keysets	5 008	2 773	31 %
manage_app_context	3 175	1 758	19 %
get_usage_metrics	2 274	1 259	14 %
how_to	2 138	1 184	13 %
get_chat_sdk_documentation	825	457	5 %

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

Servers that mention claude or cursor.

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.