Weapon Lab
Find and fix first-person weapon bugs behind a gate: your game's probe measures, the Gate judges
Runs on your machine from its package; the steps are below.
What it does
- Reads
- Writes
- High impact
At most: moves money, runs code or commands, deletes data, or sends messages for you.
What it costs
FreeOdel charges nothing per call. The publisher may charge for its own service.
Runs locally over stdio
This server isn't hosted — your MCP client launches it from a package registry. Use one of the commands below, or drop the config into your client (e.g. Claude Desktop).
Run
uvx weaponlab-mcp
MCP client config
{
"mcpServers": {
"weapon-lab": {
"command": "uvx",
"args": [
"weaponlab-mcp"
]
}
}
}First-person weapon bugs fixed once per kind, then for every weapon, behind a gate.
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An MCP server that finds and fixes first-person weapon bugs behind a gate: hands off the gun, a magazine crooked in its well, a blade held wrong, arms covering the screen.
Each bug becomes a case: a metric, a weapon, an action and a pass rule. Your game's own probe measures the weapons. The Gate passes a change only when its target cases pass and nothing else got worse. Fix each kind of bug once, then check every weapon with it.
Weapon Lab never runs your game itself. You write a small probe for your engine that follows the probe contract: a job file in, a rows file out. Everything else works on what the probe writes back.
What it does
| Group | Tools | What for |
|---|---|---|
| Gate | gate_run, gate_verdict, gate_propose, gate_approve, gate_set_baseline, gate_cases, ... | Keeps the bugs as cases, measures, compares against a baseline, judges a change, records a person's approval. |
| Probe | probe_run, probe_plan, probe_status | Starts your game's probe. Tries a fix before it is written: tuned fields, staged assets, screenshots, parts dumps. |
| Rig Lab | rig_pieces, rig_facts, rig_align, rig_part_line, rig_fist | Reads the posed weapon from a parts dump: its pieces, real-world facts (the magazine behind the barrel), a magazine's line into its well, a hilt in the fist. |
| Motion Lab | motion_roll, motion_roll_profile, motion_roll_set, motion_track, motion_render | Rebuilds clips in Blender: turns a hand about its forearm inside the forearm's range, puts a sliding part back on its axis. |
| Specs | spec_list, spec_read, spec_validate, spec_write | One file a weapon: marks (grip, support), anchors (pieces to find), facts, limits. |
| Contract | contract_check | Checks a probe's job, rows or parts dump. |
Try it on the demo
The demo is a toy game with two planted bugs and a probe in about 150 lines. It needs no engine.
pip install -e .
cd examples/demo
weaponlab gate run probe,rig
(python -m weaponlab works the same when pip's scripts folder is not on your PATH.)
The rifle's left hand misses its handguard by 3.75 cm. The knife's hilt lies 90 degrees across the fist.
tests/test_demo.py walks the whole loop: measure, find the fix, try it by tune, judge it.
Use it in your game
weaponlab initin your project. It writesweaponlab.jsonand empty data files.- Write your probe from the contract, starting from
examples/demo/probe/demo_probe.py. Set its command inweaponlab.json. - List your weapons in
weaponlab/data/weapons.jsonand their actions inactions.json. - Add a case for each bug you know. Measure everything once and set the baseline.
- Fix through the loop: try by tune or staging, look at the screenshots, propose, approve, import.
Check your probe on its own with weaponlab contract job|rows|parts <file>.
Add it to an MCP client
{"mcpServers": {"weaponlab": {"command": "weaponlab-mcp", "env": {"WEAPONLAB_PROJECT": "C:/path/to/your/game"}}}}
| Setting | Meaning |
|---|---|
WEAPONLAB_PROJECT | The project folder with weaponlab.json. The current folder by default. |
WEAPONLAB_BLENDER | Blender, for Motion Lab. Found on the PATH or in the usual install folders otherwise. |
Requirements
- Python 3.10 or later.
- Blender 4.4 or later for Motion Lab and renders. Nothing else needs it.
- Hand bones named as Unreal's mannequin names them (
hand_r,index_01_r,lowerarm_r) for the fist measure and the forearm roll.
Where it came from
Weapon Lab is the general part of the tools built for ToangTown, an Unreal 5.8 game with 46 weapons. Its first probe is ToangTown's. The contract's lessons come from that probe. Pose Lab (poselab-mcp) answers the body's side: clipping, the view, a grip solver. The Gate can use it as a provider.
License
MIT
