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Installation & Setup

Prerequisites​

  • Python 3.8 or higher
  • pip or pipx
  • Cursor, Claude Desktop, or another MCP-compatible client

Install the MCP Server​

pipx install fluxloop-mcp

Benefits:

  • Isolated environment (no dependency conflicts)
  • Global fluxloop-mcp command available

Option 2: Using pip​

pip install fluxloop-mcp

Option 3: From Source (Development)​

cd /path/to/fluxloop/packages/mcp
pip install -e .

Build the Knowledge Index​

The MCP server requires a pre-built knowledge index to answer questions and provide integration guidance.

# Build default index to ~/.fluxloop/mcp/index/dev
fluxloop-mcp rebuild-index

# Or use the script directly
packages/mcp/scripts/rebuild_index.sh

What gets indexed:

  • Fluxloop documentation from docs/
  • CLI guides from packages/website/docs-cli/
  • SDK guides from packages/website/docs-sdk/
  • Sample code from examples/

Index location:

  • Default: ~/.fluxloop/mcp/index/dev/
  • Custom: Set MCP_INDEX_PATH environment variable

Verify Installation​

# Check version
fluxloop-mcp --version

# Test FAQ query
fluxloop-mcp --once --query "How to integrate FastAPI?"

Expected output:

{
  "type": "response",
  "result": {
    "answer": "...",
    "citations": [...]
  }
}

Configure MCP Client​

Cursor Users​

Edit ~/.cursor/mcp.json:

{
  "mcpServers": {
    "fluxloop": {
      "command": "fluxloop-mcp",
      "args": [],
      "env": {
        "MCP_VECTOR_BACKEND": "faiss",
        "MCP_INDEX_MODE": "bundled"
      }
    }
  }
}

Restart Cursor.

Claude Desktop Users​

Edit ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "fluxloop": {
      "command": "fluxloop-mcp",
      "args": []
    }
  }
}

Restart Claude Desktop.

Other MCP Clients​

Refer to your client's documentation for MCP server configuration. Use:

  • Command: fluxloop-mcp
  • Protocol: stdio (default)

Environment Variables​

VariableDefaultDescription
MCP_VECTOR_BACKENDfaissVector search backend: faiss, qdrant, none
MCP_INDEX_MODEbundledIndex source: bundled, download, remote
MCP_INDEX_PATH~/.fluxloop/mcp/index/devCustom index directory
MCP_QDRANT_URL-Qdrant server URL (if using remote backend)
MCP_QDRANT_API_KEY-Qdrant API key

Troubleshooting​

"Command not found: fluxloop-mcp"​

Cause: Package not installed or not in PATH.

Solution:

# Verify installation
pip list | grep fluxloop-mcp

# Reinstall if missing
pip install --force-reinstall fluxloop-mcp

"Index directory does not exist"​

Cause: Knowledge index not built.

Solution:

fluxloop-mcp rebuild-index

"No matching documents found"​

Cause: Index is empty or outdated.

Solution:

# Rebuild index
fluxloop-mcp rebuild-index

# Verify index
python -m fluxloop_mcp.index.validator --index-dir ~/.fluxloop/mcp/index/dev

MCP Server Not Responding in Cursor​

Cause: Configuration error or server crash.

Solution:

  1. Check ~/.cursor/mcp.json syntax (valid JSON)
  2. Test server manually: fluxloop-mcp --once --query test
  3. Check Cursor logs: View → Output → Select "MCP" channel

Next Steps​