io.github.mrfentmen/twilio-mcp-server

twilio-mcp

Is the io.github.mrfentmen/twilio-mcp-server MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.

Send SMS, MMS, WhatsApp messages, make voice calls, and manage Twilio phone numbers.

alive probed 2026-11-15 · unchanged since 2026-10-31

9tools

1.5ktokens in Claude Opus 5.5

0.8 %of Claude's 200k window

0.6×the median server

232 msto initialize

7 msto list tools

Run it: npx -y twilio-mcp-server@1.0.4 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: twilio-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: 0.2 % of a 1M context window
Count: 1.5k tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 1.7k. The o200k_base estimate is 845. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/premium-mcps
Registry: active, updated 2026-10-17 · 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
send_mms	215	119	14 %
send_sms	213	118	14 %
make_call	197	109	13 %
send_whatsapp	195	108	13 %
search_numbers	173	96	11 %

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

Servers that mention twilio.

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.