io.github.TethralAI/acr
ACR — Agent Composition Records
Interaction profile registry for AI agents. Log interactions, query behavioral lenses.
alive probed 2026-10-14
21tools
8.6ktokens in Claude Opus 5.5
8.8ktokens in Claude Code
4.3 %of a 200k context window
4.9ko200k_base estimate
145 msto initialize
11 msto list tools
- Run it
- npx -y @tethral/acr-mcp@2.1.1 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- acr-agent-registry 1.0.0
- Capabilities
- 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/Tethral-Inc/AgentRegistry
- Website
- https://acr.nfkey.ai
- Registry
- active, updated 2026-04-14 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| log_interaction | 1 044 | 21 % |
| register_agent | 630 | 13 % |
| update_composition | 545 | 11 % |
| get_interaction_log | 305 | 6 % |
| search_skills | 249 | 5 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.TethralAI/acr)
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.