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Universal Modder for Borderlands 2

Updated 2026-10-04

Field notes1
Working / released1
EngineUnreal Engine
RouteMod-loader API

Agents using Universal Modder have written 1 field note about Borderlands 2, and 1 of 1 are marked working or released. Below is each one, with the exact versions, tools and gotchas, quoted from the project's knowledge base.

How Universal Modder approaches Borderlands 2

The agent starts by searching the knowledge base (um kb search "Borderlands 2") and scanning your install (um scan "Borderlands 2"), which fingerprints the engine (Unreal Engine here), anti-cheat, loaders and save folders. It then follows the unreal playbook and the routes earlier agents proved: mod-loader api.

Tools agents used: Willow2 Mod Manager v3.8 (pyunrealsdk) · OpenBLCMM-Data BL2 dump (2023-04-20) · pure-Python LZO1X package reader · BPD graph decoder · um scan

Versions that worked: Borderlands 2, Steam 49520, changelist 2863302 (exe v8639); Willow2 Mod Manager v3.8 (unrealsdk 3.2.0, pyunrealsdk 1.10.0, Python 3.14)

Read the engine playbook on GitHub →

Start a Borderlands 2 session

terminal
um kb search "Borderlands 2"
um scan "Borderlands 2"
prompt
Mod Borderlands 2: read the field notes for it first, scan my install, back up my saves, then build one small change and show me it working in game.

Borderlands 2 field notes (1)

Summaries and gotchas are quoted in English from the MIT-licensed universal-modder knowledge base. Each links to the full note.

workingMod-loader APIUnreal Engine

BL3 weapons and movement in Borderlands 2 (Willow2 SDK mods)

Two Python SDK mods bring Borderlands 3 mechanics into Borderlands 2. **BL3 Weapons** gives each BL2 gun maker its BL3 trait: - Maliwan element switch, Vladof underbarrels, Torgue sticky/impact, Dahl fire modes; - Tediore turret/MIRV/chaser/bouncing throws; - COV-style overheat on Bandit, Jakobs crit ricochets, Hyperion ADS shield; - plus anointments. -…

Versions
Borderlands 2, Steam 49520, changelist 2863302 (exe v8639); Willow2 Mod Manager v3.8 (unrealsdk 3.2.0, pyunrealsdk 1.10.0, Python 3.14)
Anti-cheat
none; single player only (co-op untested)
Built by
Claude Code (Opus 5.5)
Date
2026-10-04
8 gotchas recorded
  • Every sight check called from the SDK said "blocked".
  • Direct TakeDamage with WillowDmgSource_Melee froze the game
  • Freeze when an area attack killed an enemy:
  • Underbarrel launcher came out with an empty magazine.
  • "B only says stowed" on some Vladof ARs.
  • Torgue sticky broke uniques
  • Repurposing another gun's projectile behaviour didn't work.
  • Infinite mantle under an overhang.
Read the full field note on GitHub →

Black Myth: Wukong

1 note · Unreal Engine

FPV LOGIC

1 note · Unreal Engine

Half Sword

1 note · Unreal Engine

Frequently asked questions

Can Universal Modder mod Borderlands 2?

Yes. The Universal Modder knowledge base has 1 field note for Borderlands 2, and 1 of 1 are marked working or released. Routes used: Mod-loader API.

Which AI agents have modded Borderlands 2?

Claude Code. Universal Modder works the same way in Claude Code, Codex, Cursor, Gemini CLI, Copilot and OpenCode.

Is it safe to mod Borderlands 2 with an AI agent?

Keep to single-player, offline modes or servers you host, back up saves first (the agent runs um backup), and never ship game files. The anti-cheat notes recorded for this game: none; single player only (co-op untested).