CLI Setup - Semantica

Installing the base package registers five executables on your PATH. Each serves a distinct purpose. This page explains what they are, how to verify they are available, and which one to reach for in each situation.

Installed Commands

pip install semantica

After installation the following commands are available:

Command	Entry point	What it does
`semantica`	`semantica.cli:main`	General-purpose CLI for pipeline runs, extraction, and graph operations
`semantica-server`	`semantica.server:main`	FastAPI/uvicorn REST API server bound to `0.0.0.0:8000`
`semantica-worker`	`semantica.worker:main`	Background worker process entry point for Semantica deployments
`semantica-explorer`	`semantica.explorer:main`	Interactive browser dashboard for knowledge graph exploration
`semantica-mcp`	`semantica.mcp_server:main`	MCP server (stdio) for Claude Desktop, Cursor, Windsurf, and other MCP clients

semantica-explorer requires pip install semantica[explorer]. Running it without that extra will immediately print an error and exit. See Explorer Setup for the full walkthrough.

Verify the Installation

Confirm each command is reachable and prints its usage:

semantica --help
semantica-server --help
semantica-worker --help
semantica-explorer --help
semantica-mcp --help

Confirm the package version:

python -c "import semantica; print(semantica.__version__)"

When to Use Each Command

semantica

The general-purpose CLI. Use it for one-off pipeline runs, entity extraction, and graph operations from a shell script or CI job.

semantica-server

Starts the REST API server. Binds to 0.0.0.0:8000. Use this when another service or application needs programmatic access to Semantica over HTTP.

semantica-worker

Background task processor. Run alongside semantica-server when you need async pipeline execution outside the request cycle. Start the server first, then start one or more workers pointing at the same backend.

semantica-explorer

Launches the browser dashboard. Requires pip install semantica[explorer]. Use this to explore a saved knowledge graph interactively. See Explorer Setup.

semantica-mcp

Runs the MCP server over stdio. Configure it in your MCP client’s settings file to expose all 12 tools and 3 resources to Claude Desktop, Cursor, Windsurf, or any MCP-aware client. See MCP Server.

Usage Examples

REST server
Worker
MCP client config
Explorer
Python module form

# Starts FastAPI + uvicorn on 0.0.0.0:8000
semantica-server

Once running, check it with:

curl http://localhost:8000/health
# {"status": "healthy"}

curl http://localhost:8000/api/info
# {"name": "Semantica API", "version": "...", "status": "active"}

The interactive API docs are at http://localhost:8000/docs.

semantica-worker

The worker exits cleanly on SIGINT (Ctrl-C) or SIGTERM.

Add to your MCP client’s settings file:

{
  "mcpServers": {
    "semantica": {
      "command": "semantica-mcp"
    }
  }
}

Or use the Python module form if the command is not on PATH:

{
  "mcpServers": {
    "semantica": {
      "command": "python",
      "args": ["-m", "semantica.mcp_server"]
    }
  }
}

Test it directly before configuring your client:

echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}' | semantica-mcp

You should receive a JSON-RPC response. See MCP Server for the full list of tools and resources.

pip install semantica[explorer]
semantica-explorer --graph my_graph.json

See Explorer Setup for the full walkthrough including how to build and save a graph file.

Every command also runs as a Python module: useful when the script directory is not on PATH:

python -m semantica.mcp_server
python -m semantica.explorer --graph my_graph.json

Environment Variables

semantica-mcp reads two environment variables:

Variable	Default	Description
`SEMANTICA_KG_PATH`	(none)	Path to a saved graph file to load on startup
`SEMANTICA_LOG_LEVEL`	`WARNING`	Log verbosity: `DEBUG`, `INFO`, `WARNING`

semantica-server reads one:

Variable	Default	Description
`SEMANTICA_CORS_ORIGINS`	`http://localhost:5173,http://127.0.0.1:5173`	Comma-separated list of allowed CORS origins

No other environment variables are read by these commands.

Troubleshooting

command not found

The executables land in bin/ (Linux/Mac) or Scripts/ (Windows) of the active Python environment. If the command is not found, that directory is likely not on PATH.Activate your virtual environment first:

source venv/bin/activate   # Linux / Mac
venv\Scripts\activate      # Windows
semantica --help

Find where pip placed the scripts:

python -m site --user-scripts   # user-level install
pip show -f semantica           # shows all installed files

Command found but crashes on import

pip install --upgrade semantica
python -c "import semantica; print(semantica.__version__)"

If you have multiple Python environments, install into the one the shell resolves:

python -m pip install semantica

semantica-explorer: uvicorn is required

The Explorer extras are not included in the base install:

pip install semantica[explorer]

semantica-mcp silent failure inside a MCP client

The MCP server communicates over stdio. Test it directly from the shell first:

echo '{"jsonrpc":"2.0","id":1,"method":"ping","params":{}}' | semantica-mcp

A response of {"jsonrpc":"2.0","id":1,"result":{}} confirms the server is working. If you see nothing, check that the command is on PATH and the base package is installed.

Windows: DLL errors on startup

Install the Microsoft Visual C++ Redistributable. This is a Windows system dependency required by PyTorch and related packages, not a Semantica bug.

Next Steps

Explorer Setup

Build a graph, save it, and launch the browser dashboard.

MCP Server

All 12 tools and 3 resources exposed over the MCP protocol.

Installation

Virtual environments, optional extras, and platform-specific notes.

Quickstart

End-to-end pipeline walkthrough with working code.

​Installed Commands

​Verify the Installation

​When to Use Each Command

semantica

semantica-server

semantica-worker

semantica-explorer

semantica-mcp

​Usage Examples

​Environment Variables

​Troubleshooting

​Next Steps

Explorer Setup

MCP Server

Installation

Quickstart

Installed Commands

Verify the Installation

When to Use Each Command

Usage Examples

Environment Variables

Troubleshooting

Next Steps