BrainFlow Biosensing Boards — MCP Server

Let an AI agent stream, record and analyse EEG, EMG, ECG, EOG, PPG and EDA from the biosensing boards supported by the open-source BrainFlow SDK: OpenBCI, Muse, Neurosity, g.tec Unicorn, BrainBit and many more. It covers recording with event markers, EEG band powers and per-electrode signal-quality checks.

Research use only. This is not a medical device. Do not use it to diagnose, monitor or treat anyone. Follow the board manufacturer's safety instructions (battery operation, electrical isolation, skin preparation). This server does not change any of them.

Try it without hardware

uvx labmcp-brainflow --simulate --check

--simulate runs BrainFlow's own SYNTHETIC_BOARD, so the real BrainFlow code path runs: 16 EXG channels at 250 Hz with sine waves at 5, 10, 15 … 80 Hz plus accelerometer, gyro, PPG, EDA and temperature rows. On platforms where BrainFlow's native library can't load, or with --option simulator=fake, a pure-numpy stand-in is used instead. It simulates an 8-channel, 250 Hz EEG headset with 1/f background, posterior alpha at 10 Hz and one badly attached electrode (Fp2, heavy 50 Hz pickup), so the signal-quality check has something to find.

Connect your board

1. Pick the board with --option board=<alias> (or any BrainFlow BoardIds name such as ANT_NEURO_EE_411_BOARD, or a numeric id). The list_supported_boards tool prints this table too.
2. Give the connection detail with --address. Depending on the board, BrainFlow expects a different BrainFlowInputParams field, and the server fills in the right one:

For a board that isn't listed, the server infers the field from the address format: COM3 or /dev/… becomes a serial port, AA:BB:… a MAC address, a.b.c.d an IP address, and anything else a serial number. You can also set any field directly with --option serial_port=… / mac_address=… / ip_address=… / serial_number=… / other_info=… / timeout=….

3. Test the connection:

   uvx labmcp-brainflow --option board=cyton --address /dev/cu.usbserial-DM00Q0QN --check   # macOS
   uvx labmcp-brainflow --option board=cyton_daisy --address COM3 --check                  # Windows
   uvx labmcp-brainflow --option board=muse_2 --option serial_number=Muse-1A2B --check
   uvx labmcp-brainflow --option board=unicorn --check
   

   Close other programs that hold the device (OpenBCI GUI, Muse app) first. On Linux, add yourself to the dialout group for serial ports.

Add to your MCP client

Claude Code

claude mcp add eeg -- uvx labmcp-brainflow --option board=cyton --address /dev/ttyUSB0

Claude Desktop / Cursor / Windsurf (claude_desktop_config.json, .cursor/mcp.json, …)

{
  "mcpServers": {
    "eeg": {
      "command": "uvx",
      "args": ["labmcp-brainflow", "--option", "board=cyton", "--address", "/dev/ttyUSB0"]
    }
  }
}

With --read-only, the agent can still record and analyse data (a temporary stream is started for each recording) but cannot leave the stream running, insert markers or send configure_board commands. stop_streaming stays available.

Tools

Safety limits

Override at launch: --limit max_record_duration_s=600. BrainFlow boards measure; the only tool that can switch on an output (for example an impedance-test current through the electrodes, or the bias drive on a channel) is configure_board, a raw firmware passthrough that is marked as a hazard so MCP clients ask before running it.

Example prompts

• "Check the signal quality on all 8 Cyton channels and tell me which electrodes need more gel."
• "Record 30 s eyes-closed and 30 s eyes-open, save both as CSV in ~/data/sub-01/, and compare occipital alpha power."
• "Start streaming. I'll run an oddball task: insert marker 1 for standards and 2 for targets when I tell you. Then save the session in BrainFlow format."
• "What's the peak alpha frequency on O1 and O2 over the last 10 seconds?"
• "Is there 50 or 60 Hz mains noise in this setup, and on which channels?"
• "List the boards you support and tell me how to connect my Muse S."

Notes

• How the band powers are computed. average_relative comes from BrainFlow's DataFilter.get_avg_band_powers(apply_filter=True): detrend, 48–52 and 58–62 Hz band-stop, 2–45 Hz band-pass, Welch PSD, then bands of 1–4, 4–8, 8–13, 13–30 and 30–50 Hz averaged over channels and normalised to sum to 1. Per-channel values use detrend, a 50/60 Hz notch and a 1–45 Hz 4th-order zero-phase Butterworth (BrainFlow DataFilter), followed by a Welch PSD (Hann window, 50 % overlap, ≈0.5 Hz bins). Absolute band power is the integrated PSD in µV², and gamma is effectively 30–45 Hz.
• Signal-quality verdicts (EEG-oriented thresholds): flat means the raw SD is below 0.5 µV (disconnected); railed means at least 90 % of the ADS1299 input range is used (OpenBCI Cyton family only, using BrainFlow's formula with gain 24, set by --option exg_gain=); line_noise means 50 or 60 Hz power exceeds the whole 1–45 Hz power; high_amplitude means the band-passed RMS is above 100 µV. EMG/ECG recordings will naturally be "high amplitude".
• Units. BrainFlow returns EXG in µV "wherever possible". The OYMotion gForce armbands return ADC counts. Accelerometer, PPG and similar channels use board-specific units. Timestamps are Unix seconds.
• Presets. Some boards stream several buffers with different sampling rates, for example Muse EEG (default), IMU (auxiliary) and PPG (ancillary). Pass preset= to get_board_info and record.
• Markers go into the default preset's marker row and need an active stream (start_streaming). You can insert them while record is running. Value 0 is reserved.
• Saved files. save_path must be a new file (.csv; .csv, .tsv or .txt for save_format="brainflow"): ~ is expanded, missing folders are created, an existing file is never overwritten, and the path is checked before recording starts. save_format="csv" writes labelled columns for every row. save_format="brainflow" writes DataFilter.write_file output, which you can replay with --option board=playback --address file.csv --option master_board=<board>.
• configure_board passes a string straight to the board firmware through BrainFlow's config_board, for example OpenBCI channel settings or Muse presets. Nothing is checked: some commands switch on outputs such as the lead-off (impedance-test) current. Settings persist until changed or the board is power-cycled; check the board's SDK documentation for valid commands.
• Streams. record, get_band_powers and get_signal_quality start a temporary stream when none is running and stop it afterwards, unless start_streaming was called meanwhile (the stream then stays on) or another recording still uses it. stop_streaming ends a running record at once; it returns only the data acquired so far, with stopped_early: true.
• reconnect (and stopping the server) stops the stream and calls release_session, which frees the serial port or BLE connection.

Hardware verification