Nacre
Self-hosted permission-aware context layer for agents with MCP + API. Nacre is a Model Context Protocol (MCP) server maintained by Nacre Work. It connects to MCP-compatible clients such as Claude Desktop, Cursor, Cline, and other agents that speak the protocol. It is categorized under AI/Agent, AI/RAG and Tool/Server.
What is this MCP
Nacre is a self-hosted knowledge index for agents and applications that provides a permission-aware context layer. It features a unique permission filter that runs inside the index traversal rather than after it, ensuring that top-k queries return k permitted documents. It supports both MCP (Model Context Protocol) and REST APIs and is licensed under Apache 2.0.
How to use this MCP
You can use Nacre by self-hosting the service and integrating it with your agents or applications through its MCP or REST interfaces. The system allows you to index documents with permission metadata, then query the index while respecting access controls during the search process itself, not just as a post-filter.
What this MCP can be used for
Nacre can be used for building secure, permission-aware agent systems that need to access knowledge bases while respecting access controls. It's ideal for multi-tenant agent applications, enterprise knowledge management systems, and any scenario where you need to provide agents with context-aware information while maintaining strict permission boundaries.
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Source and details: MyBacklinks · aimcp.infoFrequently asked questions
What is the Nacre MCP server?
Nacre is a Model Context Protocol server from Nacre Work. It lets MCP-compatible AI clients call its tools over a standard interface, so agents like Claude, Cursor, and Cline can use it without custom integration.
How do I connect Nacre to my AI client?
Add Nacre to your MCP client configuration (Claude Desktop, Cursor, or Cline) as a stdio or SSE server, then restart the client so it picks up the new server.
Is Nacre free to use?
Nacre is listed on AIMCP for free. Any API keys or accounts required by the underlying service are set by its provider.
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