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8 clients · secrets stay placeholders

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{
  "mcpServers": {
    "nacre": {
      "command": "npx",
      "args": [
        "-y",
        "@nacre.work/[email protected]"
      ],
      "env": {
        "NACRE_SERVICE_KEY": "${NACRE_SERVICE_KEY}"
      }
    }
  }
}

claude mcp add nacre -e "NACRE_SERVICE_KEY=${NACRE_SERVICE_KEY}" -- npx -y @nacre.work/[email protected]

[mcp_servers.nacre]
command = "npx"
args = ["-y", "@nacre.work/[email protected]"]
env = { "NACRE_SERVICE_KEY" = "${NACRE_SERVICE_KEY}" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "nacre": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@nacre.work/[email protected]"
      ],
      "enabled": true,
      "environment": {
        "NACRE_SERVICE_KEY": "{env:NACRE_SERVICE_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "nacre": {
      "command": "npx",
      "args": [
        "-y",
        "@nacre.work/[email protected]"
      ],
      "env": {
        "NACRE_SERVICE_KEY": "${NACRE_SERVICE_KEY}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=nacre&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkBuYWNyZS53b3JrL21jcEAwLjI2LjQiXSwiZW52Ijp7Ik5BQ1JFX1NFUlZJQ0VfS0VZIjoiJHtOQUNSRV9TRVJWSUNFX0tFWX0ifX0%3D"
}

{
  "servers": {
    "nacre": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@nacre.work/[email protected]"
      ],
      "env": {
        "NACRE_SERVICE_KEY": "${NACRE_SERVICE_KEY}"
      }
    }
  }
}

{
  "mcpServers": {
    "nacre": {
      "command": "npx",
      "args": [
        "-y",
        "@nacre.work/[email protected]"
      ],
      "env": {
        "NACRE_SERVICE_KEY": "${NACRE_SERVICE_KEY}"
      }
    }
  }
}

extensions:
  "nacre":
    enabled: true
    name: "nacre"
    type: stdio
    cmd: "npx"
    args:
      - "-y"
      - "@nacre.work/[email protected]"
    envs:
      "NACRE_SERVICE_KEY": "${NACRE_SERVICE_KEY}"
    timeout: 300

Placeholders to fill from your own secret store: ${NACRE_SERVICE_KEY}. The registry never accepts secret values.

This is a local package: the command runs on your machine.

Quality – / 100not scored

Not scored: fewer than three checks apply, usually because no remote answered a credential-free probe or the server is a local package.

protocoln/a · weight 25

n/a
protocol.modern, protocol.stateless, protocol.transport, protocol.list_ttlno remote answered a protocol handshake (not probed yet, unreachable, or local-only)

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygienen/a · weight 30

n/a
tools.descriptions, tools.description_length, tools.schemas, tools.annotations, tools.directory_hints, tools.token_cost, tools.api_dumptool list unknown (behind auth, not probed, or empty)

stabilityn/a · weight 15

n/a
stability.changes, stability.rug_pulltool list unknown

dependencies50 · weight 15

fail
deps.known_vulns2 advisories to act on (malicious, or rated high or critical with a fix available): GHSA-rfgv-xxqx-mfg5 in [email protected] (indirect, fixed in 7.29.1), GHSA-w293-vg96-wgc3 in [email protected] (indirect, fixed in 7.29.1); 8 more of lower severity or without a fix
n/a
deps.mcp_sdk_versionthe official MCP SDK is not in the dependency graph
pass
deps.resolvable@nacre.work/[email protected] resolved: 23 packages

Tool list unknown · checked 2026-10-19 10:20 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 94 / 100

provenance85

livenessn/a

freshness100

hygiene100

+repository +dns-namespace +website ~liveness-unmeasured +updated-24d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

@nacre.work/[email protected] npm22 dependencies, resolved · advisories checked 2026-10-19

advisory	severity	package	fixed in
GHSA-rfgv-xxqx-mfg5undici vulnerable to Denial of Service via unrequested WebSocket subprotocol	high	`[email protected]`indirect	fixed in `7.29.1`
GHSA-w293-vg96-wgc3undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPool	high	`[email protected]`indirect	fixed in `7.29.1`
GHSA-2jfj-6hjv-fm6jundici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches	moderate	`[email protected]`indirect	fixed in `7.29.1`
GHSA-3wwx-pv8p-q78vundici vulnerable to Denial of Service via unhandled error in WebSocket permessage-deflate decompression	moderate	`[email protected]`indirect	fixed in `7.29.1`
GHSA-3xpg-4rpp-hhhmundici vulnerable to Denial of Service via unbounded decompression of compressed responses	moderate	`[email protected]`indirect	fixed in `7.29.1`
GHSA-pmjh-fq2x-6v4xundici vulnerable to Denial of Service via orphaned RetryHandler response body	moderate	`[email protected]`indirect	fixed in `7.29.1`
GHSA-rx4f-c7p8-82vqundici vulnerable to Denial of Service via WebSocketStream unclean close	moderate	`[email protected]`indirect	fixed in `7.29.1`
GHSA-2gqq-gqf2-x968undici vulnerable to response truncation via oversized chunked responses in the dump interceptor	low	`[email protected]`indirect	fixed in `7.29.1`
GHSA-8436-99hf-9mmvundici vulnerable to caching and replay of unsafe HTTP method responses	low	`[email protected]`indirect	fixed in `7.29.1`
GHSA-r53p-7pc4-xj5rundici vulnerable to downstream response splitting via retry interceptor	low	`[email protected]`indirect	fixed in `7.29.1`

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

package	registry	version	runtime	secrets
`@nacre.work/mcp`	npm	0.26.4	–	`NACRE_SERVICE_KEY`

Tools (0)

No tools observed. Local packages are never executed by the registry.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "work.nacre/nacre",
  "title": "Nacre",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "version": "0.26.4",
  "packages": [
    {
      "version": "0.26.4",
      "transport": {
        "type": "stdio"
      },
      "identifier": "@nacre.work/mcp",
      "registryType": "npm",
      "registryBaseUrl": "https://registry.npmjs.org",
      "environmentVariables": [
        {
          "name": "NACRE_SERVICE_KEY",
          "format": "string",
          "isSecret": true,
          "isRequired": true,
          "description": "Service-account key for STDIO mode. The server also needs the deployment's full environment (database and backend configuration) - see docs/mcp.md; the key alone is not enough to start it."
        }
      ]
    }
  ],
  "repository": {
    "url": "https://github.com/nacre-work/nacre",
    "source": "github"
  },
  "websiteUrl": "https://nacre.work",
  "description": "Self-hosted permission-aware context layer. Search returns only what the caller may read."
}