Tools kRPC v0.2.0 - Control KSA with scripts in Python, C#, C++, C, Java, Lua and more

[djungelorm]

kRPC allows you to control the game from scripts written in Python, C#, C++, C, Java, Lua and more.

This a continuation of the mod of the same name for KSP, and shares the same client libraries with it. It provides a server that runs in KSA, and works with all the same client libraries that the original kRPC mod uses.

This python script launches a rocket from Cape Canaveral, flies it straight up, and cuts the engines at 10 km:

import krpc
conn = krpc.connect(name="Launch")
ksa = conn.ksa
vehicle = ksa.launch_vehicle("Rocket", "CCSFS LC-39A")
flight = vehicle.flight

vehicle.auto_pilot.target_pitch_and_heading(90, 90)
vehicle.auto_pilot.engage()
vehicle.control.throttle = 1
vehicle.control.activate_next_sequence()
vehicle.control.engine_on = True

event = conn.add_event(lambda: flight.mean_altitude > 10000)
with event.condition:
    event.wait()

vehicle.control.engine_on = False
print(f"{vehicle.name} reached 10 km")

Features

• Telemetry: altitudes, speeds, attitude, pressure, g-force, thrust and specific impulse, and the delta-v of each sequence.
• Orbits, including the orbits of bodies, the orbit after a planned burn, and the predicted trajectory through sphere of influence changes.
• Parts, resources and part modules: engines, RCS, decouplers, parachutes and docking ports.
• Landing: terrain height anywhere on a body, altitude above the terrain, and the time to impact.
• Reference frames, with positions, velocities and rotations in body, vehicle, surface and orbital frames.
• Control: throttle, engines, staging, and the flight computer as an auto-pilot, including executing planned burns.
• Launching vehicles onto a launch pad, and time warp.
• Server side functions: events, streams and functions that run inside the game, once per frame.
• gRPC server: the mod includes a server that can talk to gRPC clients. Allows any language that gRPC supports to communicate.

Download
SpaceDock

Documentation
krpc.github.io/krpc/experimental/ksa, with a getting started guide, tutorials, and the API reference for each client language.

Find us on Discord: https://discord.gg/c8c36UM

Requirements

• Kitten Space Agency v2026.10.25.5707
• StarMap 0.4.8 by KlaasWhite (MIT)
• A kRPC 0.7.0 client library, for example the Python client: pip install krpc==0.7.0 See the documentation website (link above) for more details.
• Tested on Windows and Linux.

Installation

kRPC is listed on Borea
Manually:

1. Install StarMap
2. Copy the kRPC folder from the archive into <Documents>/My Games/Kitten Space Agency/mods.
3. Enable the mod in <Documents>/My Games/Kitten Space Agency/manifest.toml:
   

   [[mods]]
   id = "kRPC"
   enabled = true

4. Launch the game through StarMap.
5. The server starts once the game has loaded its mods, and listens on 127.0.0.1, ports 50000 and 50001.

The archive also holds the client stubs for C#, C++, C and Java, and example scripts. Note: pre-generated stubs are *not* required for the Python and Lua clients.

Source and Bug Reports
Source: github.com/krpc/krpc
Bug reports and feature requests: GitHub issues

License
kRPC is licensed under the LGPL v3. It bundles Google.Protobuf (BSD 3-Clause), System.IO.Ports (MIT), ASP.NET Core (MIT) and gRPC for .NET (Apache 2.0), whose licenses are in the archive.

 

[Maxi]

This looks really cool!

We would love it if you could index it in our community made Content Manager Borea. https://github.com/KSAModding/Borea via the app itself (the easiest version) or https://github.com/KSAModding/content-index

Here is an video about it:

 

[Kiwi Shark]

Yes this would be a great addition to the Borea index!

 

[djungelorm]

I'll get it added to Borea in the next release. The way I packaged it for 0.1.0 would need a hacky workaround just for that release, as the version string is baked into the root folder in the archive. Oops. Shouldn't be too long

I also updated the OP with planned features. I'm quite excited to be able to add gRPC - will allow many many many more client languages!

 

[djungelorm]

I just released v0.2.0, and it's now listed on Borea too!

Features added:

• gRPC server: control the game from any language gRPC supports (there are many!)
• In-game UI to configure the server
• More API coverage: engines, fuel, power, lights, kittens and EVA, camera, screenshots, saving and loading
• Drawing and UI: draw lines, shapes and text in the scene, and build your own windows
• Supports KSA v2026.10.25.5707, and has best-effort handling of other game versions. A pop-up lists any RPCs that use game code missing from that version, and the rest keep working.

Note: upgrading from v0.1.0, the mod folder is now named kRPC, so delete the old mods/kRPC.KSA folder first.