ferrumc
A reimplementation of the minecraft server in rust.
Runssource: GitHubRustMITcommit 51830e99675d
Rust, MIT licensed. The project labels itself: async rust, concurrency, cross platform, game development, game engine, game server, minecraft and minecraft protocol.
ferrumc runs. An Argusic agent installed it in 2.5 minutes and hit no errors on a clean machine with no GPU, and the whole session was recorded.
FerrumC Minecraft server compiles from source, all 219+ unit/integration tests pass, server starts in ~3ms, binds port 25565 (Minecraft protocol) and port 9000 (HTTP dashboard returning 200), and responds to TCP connections on the Minecraft port.
What the agent ended up with on a clean machine, in its own words. How this is measured
Measured by Argusic on a fresh machine every time. Every number links to its evidence. Argusic Score 100 of 100 (the mean of this project's run scores).
At a glance
Subject data from GitHub, linked at the top of this page, refreshed . Test data by Argusic (CC BY 4.0); every number links to a run page with the full log, the recording, and their sha256 hashes.
What was measured
From the run that decided this verdict. Every line is a recorded value, not an estimate.
- Install time
- 3 minutes
- Cold machine to finish
- 19 minutes
- Errors hit and fixed
- 0 hit, 0 fixed with no human help
- How the result was proved
- cargo build exited 0; cargo test --workspace ran all suites with 0 failures; ./target/release/ferrumc --log=info run started and bound to ports 25565 and 9000; curl http://localhost:9000/ returned HTTP 200; python3 TCP connect test confirmed port 25565 open and receiving data
- Model tokens used
- 51,147
- Exact commit tested
- 51830e99675d
- Container image
- sha256:cdd920bce783
What was not measured
The other half, so you can see exactly how far this evidence goes. A gap is printed as a gap and never filled in.
- Peak GPU memory
- this ran on a CPU machine, so there was no GPU to sample
- Behaviour over a long run
- each attempt uses the smallest documented settings and a fixed time budget, so this measures whether it runs, not how it holds up under load
The end of the recording
The last lines of the terminal session that decided this verdict, exactly as they were recorded.
2026-10-03T16:36:06.475167Z ERROR codex_core::session: failed to record rollout items: thread 01a10… tokens used 51,147 All systems are working. Let me compile the final report. **Here's what I found and verified:** **Build**: `cargo build` succeeded on first try with Rust nightly (1.101.0). No errors to diagnose … **Tests**: All test suites passed with 0 failures across the entire workspace (unit tests in physic… **Server launch**: - `ferrumc --log=info run` starts in ~3ms, binds on port 25565 (Minecraft protocol) and 9000 (HTTP … - Port 25565 is open and accepts TCP connections - Dashboard returns HTTP 200 on `http://localhost:9000/` - Minecraft protocol handshake responds to connections (returns data and logs expected "Connection …
Replay the whole session, every command from a clean machine to this point.
How it was tested
One agent, one container, no human help. It installs the project the way its own documentation says to, runs it, and fixes what breaks. Everything below is recorded as it happened: the terminal session, the log and the exact commit. The full method.
Strengths and limits
Measured facts, not opinions. How this is written.
What went well
- Reached a running state on a clean machine, with the session recorded.
- Installed in 2.5 minutes.
- Nothing broke on the way: zero errors between clone and running.
- Ran without a GPU, so it does not need one to start.
- Licensed MIT, as reported by its host.
What did not, or is not known
- Measured once so far. A single attempt shows it can run, not that it runs reliably.
What it is a reasonable choice for
- Trying it on a laptop or a small server: it reached a running state without a GPU.
- A quick evaluation: it was running 2.5 minutes after the clone.
- Following its own README: the documented path worked with nothing to fix.
Also tested, in the same area
Every one of these was installed and run by Argusic on a clean machine. Nothing appears here that was not tested.
Run history
Topics (from GitHub)
async-rustconcurrencycross-platformgame-developmentgame-enginegame-serverminecraftminecraft-protocolminecraft-servermoddingmultiplayernetworkingopen-sourcepacket-handlerperformanceprotocol-implementationrustserver-frameworktokio
Embed the badge
Markdown for the project README. It links back here; terms on the terms page.
[](https://argusic.com/subject/ferrumc)Questions
- Does ferrumc run?
- Yes. ferrumc runs. Argusic installed and launched it on a clean machine in 3 minutes, hitting 0 errors on the way, and recorded the session.
- How did Argusic test ferrumc?
- On a fresh, disposable machine, with every command recorded and the repository pinned at commit 51830e99675d. One attempt is recorded, and the full method is on the methodology page.
- What did it cost to test ferrumc?
- The run that produced this verdict cost $0.09: real compute and model cost, not a list price per million tokens. It is recorded on that run's page.
- How long does ferrumc take to install?
- 2.5 minutes in the run that decided this verdict, from a clean machine to a running state. That is one measured attempt, not an average.
- Does ferrumc need a GPU?
- Not to start. Argusic reached a running state on a machine with no GPU.
- What goes wrong when installing ferrumc?
- Nothing did, in the recorded run: zero errors between clone and running.
- Where is the evidence for ferrumc?
- The recorded run is on this page, each linking to its full log and terminal recording, stored with a sha256 fingerprint so it cannot be quietly altered.