gramps-web-mcp

.NET 10

Companion MCP server for the Gramps Web open-source genealogy platform. It gives AI agents structured, tool-based access to family trees through the Model Context Protocol.

This project is not a standalone genealogy UI or replacement for Gramps Web. Run it alongside an existing Gramps Web instance; your users, trees, media, permissions, and genealogy editing UI stay in Gramps Web.

Features

• 57 MCP tools — read, create, update, and delete people, families, events, places, sources, citations, notes, media, repositories, and tags
• Search and browse — full-text search and paginated object listing
• Kinship tools — ancestors, descendants, relationships, and timelines
• Composite workflows — quick-add person, add event to person, find by Gramps ID
• 6 MCP resources — type vocabularies, input guide, tree metadata, name settings, and opt-in media thumbnails/files for vision-capable agents
• Media safeguards — size limits, MIME allowlists, and private-record defaults
• MCP prompts — guided workflows for research, adding people/families, and imports
• Multiple transports — stdio (local clients), Streamable HTTP, legacy SSE
• Read-only mode — keep all tools visible while blocking create, update, and delete calls

See the tool catalog for the full list.

Prerequisites

• .NET 10 SDK (for local development)
• A running Gramps Web instance with API access
• Docker (optional, for container deployment)

Quick start

Local development (demo server)

run-local-server.sh connects to the public demo.grampsweb.org instance using well-known demo credentials (owner / owner):

./run-local-server.sh

The server starts with HTTP transport at http://127.0.0.1:8080/mcp. No API key is required when binding to loopback only.

Docker

Pre-built multi-arch images (linux/amd64, linux/arm64) are published to GitHub Container Registry. Docker picks the matching architecture automatically; amd64 covers most Unraid and x86 hosts, arm64 covers Apple Silicon and ARM SBCs:

docker pull ghcr.io/scormave/gramps-web-mcp:latest

docker run -p 8080:8080 \
  -e GRAMPS_API_URL=https://your-gramps.example.com \
  -e GRAMPS_USERNAME=your-user \
  -e GRAMPS_PASSWORD=your-password \
  -e GRAMPS_TREE_ID=your-tree-uuid \
  -e MCP_API_KEY=your-secret-api-key \
  ghcr.io/scormave/gramps-web-mcp:latest

The image exposes a GET /health endpoint for Docker HEALTHCHECK, Unraid container health, and other uptime monitors. It returns HTTP 200 when the MCP server can authenticate against Gramps Web, or HTTP 503 otherwise. The public response is minimal by default: { "status": "healthy" } or { "status": "unhealthy" }. Startup logs include a line such as Connected to Gramps Web at … once the API is reachable.

The image defaults to Streamable HTTP (MCP_TRANSPORT=http) on port 8080, which is what the commands above use. Clients that spawn the container themselves (such as MCP Registry installs) instead run it over stdio with -e MCP_TRANSPORT=stdio and stdin kept open (docker run -i); that is the mode declared in server.json.

For read-only mode, add -e GRAMPS_READ_ONLY=true:

docker run -p 8080:8080 \
  -e GRAMPS_API_URL=https://your-gramps.example.com \
  -e GRAMPS_USERNAME=your-user \
  -e GRAMPS_PASSWORD=your-password \
  -e GRAMPS_TREE_ID=your-tree-uuid \
  -e MCP_API_KEY=your-secret-api-key \
  -e GRAMPS_READ_ONLY=true \
  ghcr.io/scormave/gramps-web-mcp:latest

Unraid installation

Unraid users can install gramps-web-mcp from Community Applications. The template source is maintained at Scormave/gramps-web-mcp-unraid. For Unraid-specific help, see the support thread on the Unraid forums.

Basic setup:

1. In Unraid, open Apps / Community Applications.
2. Search for gramps-web-mcp and install the template.
3. Set GRAMPS_API_URL, GRAMPS_USERNAME, GRAMPS_PASSWORD, and GRAMPS_TREE_ID for your Gramps Web instance. Set MCP_API_KEY when the MCP port is reachable from other machines on your network.
4. Keep the default container port 8080, or map it to another host port.
5. Start the container and check /health; it returns HTTP 200 once the service can authenticate to Gramps Web, with a minimal JSON response by default.

For the easiest pairing, run Gramps Web and gramps-web-mcp on the same Unraid Docker network and set GRAMPS_API_URL to the Gramps Web container URL. The MCP endpoint for clients is http://<unraid-host>:<mapped-port>/mcp.

Gramps Web + MCP (Docker Compose)

To run Gramps Web and the MCP server on the same host and Docker network, use docker-compose.example.yml as a starting point:

cp docker-compose.example.yml docker-compose.yml
cp .env.example .env
# Complete the Gramps Web setup wizard, then set credentials in .env
docker compose up -d

Gramps Web is published on port 5055; MCP is on 8080 (/mcp and /health). Inside the compose network the MCP container reaches Gramps Web at http://grampsweb:5000.

Claude Desktop (MCPB extension)

One-click install for Claude Desktop is available as an MCP Bundle (.mcpb) from GitHub Releases. Download the bundle for your platform:

1. Download the .mcpb file for your OS from the latest release.
2. Double-click it, or drag it into the Claude Desktop window.
3. Enter your Gramps Web URL, username, password/token, and tree UUID.
4. Leave Read-only mode enabled for your first session; disable it only when you want Claude to create or edit records.
5. Complete installation and start a new chat.

The extension runs locally over stdio and does not require the .NET SDK on your machine. See mcpb/README.md for packaging details and PRIVACY.md for the privacy policy.

To build a bundle locally:

./scripts/pack-mcpb.sh osx-arm64   # or osx-x64, win-x64, linux-x64, linux-arm64

MCP client configuration (manual)

stdio (e.g. Claude Desktop, Cursor):

{
  "mcpServers": {
    "gramps-web": {
      "command": "dotnet",
      "args": ["run", "--project", "/path/to/gramps-web-mcp/GrampsWeb.Mcp/GrampsWeb.Mcp.csproj"],
      "env": {
        "MCP_TRANSPORT": "stdio",
        "GRAMPS_API_URL": "https://your-gramps.example.com",
        "GRAMPS_USERNAME": "your-user",
        "GRAMPS_PASSWORD": "your-password",
        "GRAMPS_TREE_ID": "your-tree-uuid"
      }
    }
  }
}

To run a stdio server in read-only mode, add "GRAMPS_READ_ONLY": "true" to env.

HTTP (remote / Docker):

Point your MCP client at http://host:8080/mcp with Streamable HTTP transport. When MCP_API_KEY is set, send it as Authorization: Bearer <key> or X-Api-Key: <key> on every MCP request.

curl -X POST http://host:8080/mcp \
  -H "Authorization: Bearer $MCP_API_KEY" \
  -H "Accept: application/json, text/event-stream" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"curl","version":"1.0"}},"id":1}'

Vision-capable agents can read opt-in media through tools (GetMediaThumbnail, GetMediaFile) or through binary MCP resources such as gramps://media/{handle}/thumbnail/{size} and gramps://media/{handle}/file. GetMediaFile returns image, audio, or embedded blob resource content depending on MIME type. End-to-end analysis depends on the MCP client forwarding the typed tool content or binary resource content to a capable model.

Configuration

Required (Gramps connection)

Runtime mode

• GRAMPS_READ_ONLY: set to true to block create, update, and delete calls while keeping tools visible.
• GRAMPS_MUTATION_SERIALIZE: runs create/update/delete HTTP calls one at a time in this process.
• GRAMPS_MUTATION_MIN_INTERVAL_MS: minimum pause between mutation HTTP calls, including steps inside composite tools.

Runtime notes:

• GRAMPS_READ_ONLY=false means the server starts in read/write mode.
• The Claude Desktop MCPB extension is the exception: its setup form defaults to read-only for safer first use.
• Write serialization and the optional interval protect typical Gramps Web SQLite trees from agent write bursts.
• The write gate is in-process only. It does not coordinate across multiple MCP replicas, the Gramps Web UI, or other API clients.
• SQLite deployments that still see database is locked on sequential edits should set GRAMPS_MUTATION_MIN_INTERVAL_MS=250 or 500.
• On SQLite lock errors or upstream HTTP 429, mutation tools return a retryable MCP error with a short backoff hint instead of a generic 500.
• Set GRAMPS_MUTATION_SERIALIZE=false when Gramps Web uses PostgreSQL and you want parallel writes.

Media file access

Media byte tools/resources are disabled by default. get_media remains available for metadata without enabling file downloads.

Prefer GetMediaThumbnail or gramps://media/{handle}/thumbnail/{size} for AI analysis. Full files can be large and sensitive, and are still subject to the same size, MIME, and private-record checks.

Exact types and type/* wildcards are supported. The default media allowlist is image/jpeg,image/png,image/webp,image/avif,application/pdf.

Transports

Set GRAMPS_API_URL, GRAMPS_USERNAME, GRAMPS_PASSWORD, and GRAMPS_TREE_ID as usual.

For HTTP transport, responses stream over SSE. See the Streamable HTTP spec for protocol details. Set ASPNETCORE_URLS to choose the listen address, for example http://127.0.0.1:8080.

Optional (MCP transport)

HTTP authentication

When MCP_API_KEY is set, all MCP HTTP/SSE endpoints require the key on every request. GET /health stays anonymous for Docker and load-balancer probes.

Generate a key:

openssl rand -base64 32

Without a key, the server still starts (backward compatible). If the listen address is not loopback-only, a warning is logged recommending that you set MCP_API_KEY, use a reverse proxy with its own authentication, or bind to 127.0.0.1 for local use only.

Inside Docker, ASPNETCORE_URLS is typically http://0.0.0.0:8080, so the warning appears even when the host publishes the port on 127.0.0.1 only. That is expected when external access is already restricted.

Development

dotnet test

See CONTRIBUTING.md and the developer guide.

Documentation

Contributing

Contributions are welcome. See CONTRIBUTING.md.

Security

To report a vulnerability, see SECURITY.md.

Privacy Policy

The Claude Desktop extension is a local MCP server. It sends data only to the Gramps Web instance you configure and does not collect analytics or conversation data. See PRIVACY.md for full details.

License

Copyright (c) Scormave

This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0-or-later). Because this is network server software, hosting a modified version requires making the corresponding source available to users interacting with it over a network.