# @nacre.work/mcp

Nacre MCP server: Streamable HTTP and STDIO

- **Type:** MCP server
- **Trust:** 85/100 (A), scored on the package rubric
- **Verification:** verified (build provenance)
- **Version:** 0.26.7
- **Author:** Nacre
- **License:** Apache-2.0
- **npm:** @nacre.work/mcp
- **Source:** https://github.com/nacre-work/nacre
- **Compatible clients:** claude-code, cursor, copilot, gemini (basis: transport)

## Trust

85/100 (A), scored on the package rubric
- Publisher verified: no
- Build provenance: verified attestation
- npm trusted publishing (OIDC): yes
- Install scripts: nothing suspicious found
- Prompt-injection scan: not run
- Obfuscation scan: not run
- Evidence age: 0 days

## Security scan

- **Status:** clean
- **Scanned:** 2026-09-26T19:49:04.269Z
- **Version scanned:** 0.26.7
- **CVEs:** none found by OSV at scan time

## Tools

6 declared. Statically extracted from the shipped source — a floor on the surface, not a census.
- `search` — Natural-language query
- `list_layers` — The layers you can read, with descriptions and document counts.
- `get_document` — Fetch one document by id, or by external_id within a layer: its title, layer, status and
- `ingest_status`
- `ingest_document`
- `delete_document` — Delete a document: it leaves search results immediately and its vectors are reclaimed

## Install

**Verdict: install** — No blocking findings and no open coverage gaps — safe to install as configured.
**Config** (claude-code):
```json
"{\n  \"mcpServers\": {\n    \"mcp\": {\n      \"command\": \"npx\",\n      \"args\": [\n        \"-y\",\n        \"@nacre.work/mcp\"\n      ],\n      \"env\": {\n        \"NACRE_SERVICE_KEY\": \"<YOUR_NACRE_SERVICE_KEY>\"\n      }\n    }\n  }\n}"
```
**Credentials it will ask for** (names only — Forge never holds a value):
- `NACRE_SERVICE_KEY` — Nacre Service Key (required)
Placeholders only. Forge never holds, brokers, or transmits a credential value — replace each <YOUR_NAME> in your own config file. Do not send a value back to Forge; no Forge endpoint accepts one.
- This entry needs 1 credential (1 required). The generated config carries placeholders, so it will fail in the editor rather than at runtime if they are left unset.

## Blast radius

Extensive blast radius — deletes data; holds an api key.
- Floor 51, ceiling 51 (tier: extensive)
- This is impact, not likelihood. A high radius is not a defect: a filesystem server is supposed to write files. It is never part of the trust score.

## Machine-readable views of this entry

- Signed JSON: https://forgeregistry.com/api/v1/packages/%40nacre.work%2Fmcp
- Install plan: https://forgeregistry.com/api/v1/packages/%40nacre.work%2Fmcp/install-plan
- Alternatives: https://forgeregistry.com/api/v1/alternatives/%40nacre.work%2Fmcp
- HTML page: https://forgeregistry.com/registry/%40nacre.work%2Fmcp
- MCP: POST https://forgeregistry.com/api/mcp → `forge_get_package` / `forge_install_plan`

## About this document

Generated by Forge (https://forgeregistry.com) — a compact rendering of the same record served, signed, at the JSON URL above. Trust and scan facts are the registry's own measurements; anything Forge did not measure is named as unmeasured rather than omitted.