io.github.spruikco/send16-mcp
send16
Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.
alive probed 2026-10-10 · HTTP 200
82tools
23ktokens in Claude Opus 5.5
24ktokens in Claude Code
11.7 %of a 200k context window
13ko200k_base estimate
856 msto initialize
347 msto list tools
- Endpoint
- https://mcp.send16.com/mcp (streamable-http)
- Host
- mcp.send16.com
- Protocol
- 2025-11-25
- Reports itself as
- send16 0.5.15
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-10. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/spruikco/send16-mcp
- Website
- https://send16.com
- Registry
- active, updated 2026-07-12 · registry entry
- Reachable
- 7 of the last 7 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| send_email | 675 | 5 % |
| create_campaign | 525 | 4 % |
| update_campaign | 479 | 4 % |
| save_template | 461 | 4 % |
| send_broadcast | 457 | 3 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-10 10:30 | alive | 2.1 s | 82 | 23k | 13k |
| 2026-10-05 16:30 | alive | 856 ms | 79 | 22k | 12k |
| 2026-10-05 00:56 | alive | 645 ms | 79 | 12k | |
| 2026-10-04 10:07 | alive | 1.4 s | 79 | 12k | |
| 2026-10-04 08:00 | alive | 1.3 s | 79 | 12k | |
| 2026-10-03 20:40 | alive | 1.5 s | 79 | 12k | |
| 2026-10-03 17:55 | alive | 339 ms | 79 | 12k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.spruikco/send16-mcp)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.