io.github.levelsofself/nervous-system
nervous-system
Governance for LLM agents: 7 enforced rules + read-only reference tools. Safe in any MCP client.
alive probed 2026-10-14
12tools
1.0ktokens in Claude Opus 5.5
1.2ktokens in Claude Code
0.5 %of a 200k context window
567o200k_base estimate
325 msto initialize
6 msto list tools
- Run it
- npx -y mcp-nervous-system@1.12.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- nervous-system 1.12.1
- Capabilities
- resources, tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-14. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/levelsofself/mcp-nervous-system
- Registry
- active, updated 2026-07-13 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| audit_mcp_config | 148 | 26 % |
| dispatch_to_llm | 65 | 11 % |
| check_preflight | 51 | 9 % |
| emergency_kill_switch | 51 | 9 % |
| verify_audit_chain | 35 | 6 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.levelsofself/nervous-system)
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.