ai.getmarrow/marrow
Marrow AI: Control Layer for AI Agents
A named yes before your AI agent acts, plus proof the next agent can reuse. Works in any MCP client.
alive probed 2026-10-15
17tools
2.5 %of a 200k context window
5.0ktokens, o200k_base estimate
164 msto initialize
9 msto list tools
- Run it
- npx -y @getmarrow/mcp@3.9.102 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- marrow 3.9.102
- Capabilities
- prompts, tools
- Instructions
- 1 795 characters
- Claude count
- The count_tokens endpoint refused the tool schemas: tools.10.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level. The estimate stands in.
- Repository
- https://github.com/getmarrow/marrow-mcp
- Website
- https://getmarrow.ai/marrow-for-mcp
- Registry
- active, updated 2026-10-12 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| marrow_commit | 1 080 | 22 % |
| marrow_replay_compare | 546 | 11 % |
| marrow_model_usage | 544 | 11 % |
| marrow_arbitrate | 461 | 9 % |
| marrow_think | 447 | 9 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/ai.getmarrow/marrow)
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.