Nacre - AI Context Layer
Permission-aware context for AI agents, self-hosted
What it does
Nacre is a self-hosted knowledge index for AI agents, where permission is part of retrieval rather than a filter bolted on after it. An agent acts for a person and reaches only what that person may read: the access check runs inside the index traversal, so results are never trimmed afterwards. Connect over MCP or REST, run it with Docker in two minutes, keep every document on your own machine. Apache 2.0 - and a live demo where one query gives three people three different answers.
Self-hosted retrieval for AI agents with fine-grained access control: every agent and every person sees only what they are cleared for. The permission filter runs inside the index, not after it. Apache 2.0 core; commercial modules for multi-tenancy, SSO and SCIM, deny rules, and SIEM export.
Permission-aware context layer for agents. Your index, your access rules, your perimeter. Nacre shimmers, but you cannot see through it. Its light comes from interference between layers — and it stays opaque. Every agent and every user sees the cross-section they are cleared for, and not one line more. Simulated here. The same three-answers-to-one-question demo runs on a real index at demo.nacre.work , with logins published — or take an organization of your own for a day. Most retrieval stacks fetch the top k results and then remove the ones the caller may not see. Ask for ten and you get ten minus whatever was stripped — silently, and worse the more restricted the reader is. Nacre puts the…from nacre.work
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