Install
Three ways to run this device. Each one serves its fake backend: no instrument, no simulator install and no upstream checkout.
OpenAI4S (one command)
openai4s lab add labs/croningp__pylabwareInstalls the device into the OpenAI4S Lab on its fake backend and starts it. First time? See setup below.
Or, in the workbench, open the Lab tab → Market → Install.
Standalone MHS endpoint
git clone --depth 1 https://github.com/PKU-YuanGroup/OpenMHS.git && cd OpenMHS
PYTHONPATH=MHS/sdk/src python3 -m mhs serve labs/croningp__pylabware --port 7400
# in a second terminal, from the same directory:
PYTHONPATH=MHS/sdk/src python3 -m mhs describe --endpoint http://127.0.0.1:7400Serves the device as an MHS endpoint on port 7400 from an OpenMHS clone (Python 3.10 or later, standard library only); describe prints what it offers.
Any MCP host (Claude Desktop, Cursor, …)
{
"mcpServers": {
"pylabware": {
"command": "python3",
"args": [
"-m",
"mhs",
"serve",
"labs/croningp__pylabware",
"--mcp"
],
"env": {
"PYTHONPATH": "/path/to/OpenMHS/MHS/sdk/src"
}
}
}
}Add this server to the host's MCP configuration and replace /path/to/OpenMHS with the path of your OpenMHS clone. The host starts the server and talks to it on stdin and stdout.
What it does
Measures
plunger_positioninitializedidleconnected
Adjusts
valve_position
Actions
transfer- Dispense or withdraw a number of plunger increments
move_plunger- Move the plunger to an absolute or a relative position
move_home- Home the plunger with the native move_home (an absolute move to position 0)
set_speed- Set the maximum plunger velocity in increments per second
set_start_velocity- Set the starting velocity of the plunger ramp
set_stop_velocity- Set the cut-off velocity at the end of the plunger ramp
set_predefined_speed- Select a predefined maximum-velocity code (SPEED_MODES)
set_ramp_slope- Select an acceleration/deceleration ramp code (RAMP_PLOPE_MODES)
set_resolution_mode- Select the plunger motor resolution mode N0, N1 or N2
stop_pump- Safe state: stop the current plunger program with the native stop (T); it takes no input
Names as the driver declares them. Units, limits and the safety declaration are in the package's REFERENCE.md.
First-time setup
The OpenAI4S workbench with the OpenMHS lab, from a source checkout:
# OpenAI4S workbench with the OpenMHS lab (source checkout)
git clone --recursive https://github.com/PKU-YuanGroup/OpenAI4S.git
cd OpenAI4S && ./setup.sh && source .venv/bin/activate
openai4s lab add labs/croningp__pylabware
openai4s serve # open the Lab tabThe standalone endpoint and the MCP server need only an OpenMHS clone and Python 3.10 or later. More in the market's getting-started guide and on the OpenAI4S host page.
Source and evidence
- Upstream
- croningp/pylabware
- Pinned commit
fbf287c7866a- Licence
- MIT
- Stars
- 15
- Evidence
contract_checkedon the fake backend- Backends
- fake, hardware
The driver package MHS/drivers/labs/croningp__pylabware wraps the upstream code at the pinned commit. Its REFERENCE.md documents the full contract: every value, action, unit, limit and the safety declaration.