Nacre
Self-hosted permission-aware context layer. Search returns only what the caller may read.
MCP server · by nacre.work
About
Nacre is an MCP server published by nacre.work. Marketplaces we read that list it: 2 (Official MCP Registry, npm registry (MCP servers)). The last change we recorded was on 2026-10-25. As of our marketplace pass on 2026-10-31.
What it asks for
- Runs on your machine
- Secrets: 1
- Settings: 1
Requires: NACRE_SERVICE_KEY (secret)
What it declares, asks for and runs, in full
Only install plugins from developers you trust. We list what marketplaces publish and do not test plugins.
Package
npm @nacre.work/mcp (@nacre.work/mcp on npm)
- npm downloads/week: 4 634 (2026-10-17)
- npm downloads/month: 6 108 (2026-10-17)
- Latest version on npm: 0.41.0, published 2026-10-10
No known vulnerabilities in OSV for 0.41.0 (checked 2026-10-23)
npm facts come from the public npm registry (registry.npmjs.org, api.npmjs.org). Each figure is the registry's own and is never added to another. A registry that publishes no figure shows none: no number is not zero. Vulnerability records come from OSV.dev (CC BY 4.0) and concern the declared version only; a listing that declares no version gets no answer. We do not scan code.
Works with
- Claude Code
- Codex
- Cursor
- VS Code
- Copilot CLI
From the marketplaces that list it and the MCP transport it declares, as each client documents them. We do not test plugins.
Connect
Commands and configs built only from what its marketplaces declare. We do not run them for you and do not test plugins.
As a local MCP server: npm package
Built from what Official MCP Registry declares.
claude mcp add --env "NACRE_SERVICE_KEY=<YOUR_NACRE_SERVICE_KEY>" --transport stdio nacre -- npx -y @nacre.work/mcp[mcp_servers.nacre]
command = "npx"
args = ["-y", "@nacre.work/mcp"]
[mcp_servers.nacre.env]
NACRE_SERVICE_KEY = "<YOUR_NACRE_SERVICE_KEY>"{
"mcpServers": {
"nacre": {
"command": "npx",
"args": [
"-y",
"@nacre.work/mcp"
],
"env": {
"NACRE_SERVICE_KEY": "<YOUR_NACRE_SERVICE_KEY>"
}
}
}
}Replace the values in angle brackets with your own. We show the names of the settings, never values.
Where it is published
| Marketplace | Status | Version | Figures | Verified | First seen |
|---|---|---|---|---|---|
| Official MCP Registry (Open the registry record) | Listed | 0.41.0 | Downloads/month (npm): 6 108 Downloads/week (npm): 4 634 Forks (GitHub): 0 Stars (GitHub): 2 |
Not marked | |
| npm registry (MCP servers) (Open on npm) | Listed | 0.41.0 | Downloads/month (npm): 6 108 Downloads/week (npm): 4 634 Forks (GitHub): 0 Stars (GitHub): 2 |
Not marked |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
How its figures have moved
- 2026-10-242
- 2026-10-292
Each dot is a day we read a different number; flat stretches are days the number did not move. Figures of different marketplaces are never added up.
What changed
- Official MCP Registry: released version 0.41.0 (was 0.26.4)
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Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Package data comes from the public npm registry (registry.npmjs.org). Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.