Locus

MCP server for Locus — a local semantic dataspace manager powered by Ollama.

Exposes all Locus HTTP endpoints as MCP tools so any MCP-compatible client (Claude Desktop, Cursor, etc.) can manage dataspaces, ingest documents, and run semantic search.

Requirements

• Locus running locally or remotely
• Node.js 18+

Installation

npm install -g @miguelaperez/locus-mcp --registry=https://npm.pkg.github.com

Or run directly with npx (package is on GitHub, not the npm registry):

npx github:MiguelAPerez/locus-mcp

Note: @miguelaperez/locus-mcp is a GitHub Packages package, not published to the public npm registry. Using npx @miguelaperez/locus-mcp (without github:) will fail unless you've configured your npm registry. Use github:MiguelAPerez/locus-mcp instead.

Configuration

Environment variable	Default	Description
LOCUS_URL	http://localhost:8000	Base URL of the Locus API

MCP client setup

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "locus": {
      "command": "npx",
      "args": ["-y", "github:MiguelAPerez/locus-mcp"],
      "env": {
        "LOCUS_URL": "http://localhost:8000"
      }
    }
  }
}

Cursor / other clients

{
  "locus": {
    "command": "npx",
    "args": ["-y", "github:MiguelAPerez/locus-mcp"],
    "env": {
      "LOCUS_URL": "http://localhost:8000"
    }
  }
}

mcpo (HTTP proxy)

{
  "mcpServers": {
    "locus": {
      "command": "npx",
      "args": ["-y", "github:MiguelAPerez/locus-mcp"],
      "env": {
        "LOCUS_URL": "http://locus:8000"
      }
    }
  }
}

Tools

Spaces

Tool	Description
list_spaces	List all dataspaces
create_space	Create a new dataspace
delete_space	Delete a dataspace and all its documents

Documents

Tool	Description
list_documents	List all documents in a dataspace
ingest_document	Ingest text into a dataspace
get_document	Retrieve full text of a document by ID
delete_document	Delete a document by ID

Search

Tool	Description
search	Semantic search over a dataspace (query, k, full)

Settings & health

Tool	Description
health_check	Check if Locus is reachable
get_settings	Get current Ollama URL and embedding model
update_settings	Update Ollama URL and/or embedding model

Development

npm install
npm run dev      # watch mode
npm test         # run tests
npm run build    # compile to dist/

License

MIT