io.github.eidetic-works/nucleus
Nucleus Brain
Sovereign Agent OS — Persistent Memory, Governance & Compliance for AI Agents.
alive probed 2026-10-05 · HTTP 200
28tools
17ktokens in Claude Opus 5.5
18ktokens in Claude Code
8.6 %of a 200k context window
10ko200k_base estimate
1.8 sto initialize
367 msto list tools
- Endpoint
- https://relay.nucleusos.dev/mcp (streamable-http)
- Host
- relay.nucleusos.dev
- Protocol
- 2025-11-25
- Reports itself as
- Nucleus Brain 3.4.4
- Capabilities
- experimental, extensions, logging, prompts, resources, tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/eidetic-works/nucleus-mcp
- Website
- https://nucleusos.dev
- Registry
- active, updated 2026-07-19 · registry entry
- Reachable
- 6 of the last 6 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| nucleus_sync | 1 322 | 13 % |
| nucleus_delegate | 1 224 | 12 % |
| nucleus_engrams | 856 | 8 % |
| nucleus_sessions | 649 | 6 % |
| nucleus_governance | 571 | 5 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 14:42 | alive | 1.8 s | 28 | 17k | 10k |
| 2026-10-05 00:34 | alive | 1.7 s | 28 | 10k | |
| 2026-10-04 10:04 | alive | 3.2 s | 28 | 10k | |
| 2026-10-04 07:58 | alive | 2.7 s | 28 | 10k | |
| 2026-10-03 20:37 | alive | 3.4 s | 28 | 10k | |
| 2026-10-03 17:53 | alive | 1.2 s | 28 | 10k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.eidetic-works/nucleus)
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.