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USB Servo Controller MCP server

by Lukasz-Juranek·io.github.Lukasz-Juranek/usb-servo-controller·v0.4.1
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Drive 12 hobby servos on an open-hardware USB-C controller: moves, poses, sequences, rail current

A89/100grade A
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Safety scan
A89/100

full report

Adoption
Growing

0 stars185 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

USB Servo Controller tools (16, 2 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • board_status

    Rail current/voltage, faults, protection limits, and every channel's name, mode, travel limits, speed and current position (0 = off).

  • clear_faults

    Clear a latched overcurrent/undervoltage fault so channels can move again.

  • disable_servos

    Stop driving the given channels (numbers or names); the servos go limp.

  • go_to_pose

    Move to a saved pose (see list_poses) and wait until it arrives.

  • list_poses

    Poses and the sequence saved from the GUI (servogui.json).

  • measure_current

    Sample the servo-rail current continuously; returns peak, mean and min mA.

  • move_servos

    Move one or more servos and wait until they arrive.

  • play_sequence

    Play the GUI's saved sequence of poses (move and hold times as saved), repeated `loops` times. Stops early on a fault; capped at 120 s.

  • read_analog

    Read channel 0-7 as an analog input (0-4095 counts, 0-3.3 V).

  • release_port

    Close the serial port now (servos keep holding) so the GUI or flash.py can use the board. It reopens automatically on the next tool call.

  • run_scriptwrite action

    Start the stored script from the top.

  • script_status

    What script is stored on the board, and whether it is running.

  • set_protection

    Set the rail trip limits (0 disables either). Overcurrent is capped at 7500 mA: the board's continuous budget is ~5 A. Resets at power-up.

  • stop_all

    Panic stop: every channel off immediately.

  • stop_script

    Stop the stored script; servos keep their positions (stop_all to let go).

  • upload_scriptwrite action

    Compile a servo script and store it in the board's flash, where the firmware runs it without a PC (autorun: also start at every power-up).

Public scan report

scanner v0.1.10 · 2026-10-24 · same rubric, same numbers if you re-run it

no findings
  • Code scan5 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 1 days ago15/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year6/10
Overall 89/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How USB Servo Controller compares

Against every graded Productivity MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
89/100
higher than 80% of 1,299 Productivity servers
Tools
16
the typical Productivity server has 7
Tools that change things
13%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
185
more than 70% of 427 Productivity servers with a package

What its tools let an agent do: 9 read · 1 create · 3 change · 3 run or deploy

Install USB Servo Controller in Claude Code, Cursor or VS Code

claude mcp add usb-servo-controller -- uvx ucan-servo-mcp
Add to Cursor

What the publisher says

From the USB Servo Controller repository's README, as published. We do not edit it. Read it on GitHub

USB-C 12-Channel Servo Controller

12-channel USB-C servo controller, Pololu Maestro compatible, with an MCP server so AI agents (Claude, etc.) can drive servos. $18 on Tindie · product page.

▶ 2-minute video: wiring, current monitoring, GUI and the controller driving a real MG995

Open-source alternative to the Pololu Mini Maestro 12 that speaks the Maestro serial protocols, so Maestro libraries work unchanged — plus USB-C, servo-rail current and voltage sensing, on-board scripts. Built for JLCPCB turnkey assembly, ≈ $4.43 per board at 100 units against $29.95 for the Maestro.

AI agents (MCP server)

tools/servo_mcp.py is an MCP server that lets an AI agent move servos, run poses and sequences, and read rail current/voltage, with guardrails: per-channel limits, ramped moves, overcurrent stop. pip install -r tools/requirements.txt, then:

Claude Code

claude mcp add servo -- python /path/to/UsbServoController/tools/servo_mcp.py

Claude Desktop (claudedesktopconfig.json)

{
  "mcpServers": {
    "servo": {
      "command": "python",
      "args": ["/path/to/UsbServoController/tools/servo_mcp.py"]
    }
  }
}

Add "--port", "COM5" to pick a port, or "--mock" to try it without hardware. Close the GUI first: only one program can hold the serial port.

The server is also on PyPI, so any MCP client can run it without cloning the repo: command uvx, args ["ucan-servo-mcp"] (plus --config path/to/servogui.json to use the limits, poses and sequences saved by the GUI).

<!-- mcp-name: io.github.Lukasz-Juranek/usb-servo-controller -->

1. Quick start

pip install -r tools/requirements.txt
python tools/servogui.py              # GUI (or --mock with no hardware)
python tools/servoctl.py set 0 1500   # CLI
cd embedded-ch32 && make flash        # build + flash over USB, ~3 s, no jumper

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

USB Servo Controller: common questions

Is USB Servo Controller MCP server safe?
Yes, by our scan: it is graded A (89/100). Read the USB Servo Controller safety report
How do I install USB Servo Controller?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does USB Servo Controller need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is USB Servo Controller maintained?
The last commit was 12 days ago (2026-10-23). The latest release is v0.4.1.
What can I use instead of USB Servo Controller?
Servers from other publishers that do the same job: Argent MCP server, gflow-cli MCP server and Buoy Gg MCP server.
How does USB Servo Controller compare with other Productivity MCP servers?
safety score 89/100 (higher than 80% of 1,299 Productivity servers); tools 16 (the typical Productivity server has 7); tools that change things 13% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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