Missing Script Hunter

Finds GameObjects in project scenes and prefabs whose MonoBehaviour slots are missing (script deleted, GUID moved, or assembly dropped).

Editor-only. Unity 2021.3+. Lives in Anvil.Editor (includePlatforms: Editor). No extra packages.

Editor window

ArTchie / Anvil / Missing Script Hunter

Control	What it does
Include / Exclude	Comma-separated assetPath substrings. Empty include = all. Exclude wins.
Scan	Walks every scene and prefab under Assets/ (skips Packages/, Library/, and model prefabs).
Copy JSON	Puts the report JSON on the clipboard.
Write report	Writes <project>/AnvilReports/missing-scripts.json (creates the folder if needed).
Strip missing (Undo)	Removes missing MonoBehaviours on the last scan's assets via GameObjectUtility.RemoveMonoBehavioursWithMissingScript and Undo.RegisterCompleteObjectUndo. Prefabs are saved. Then those assets are rescanned.
Filter	Hides result rows unless guid, asset path, or object path contains the substring.
Ping / Select	Loads the scene (OpenScene) or prefab contents (PrefabStageUtility.OpenPrefab) and pings / selects the GameObject.

Each row is: assetPath, kind (scene or prefab), GameObject hierarchy path, component index, and the missing script GUID when it is still in the YAML.

Batchmode (CI)

Unity -batchmode -nographics -quit -projectPath <proj> -executeMethod Anvil.MissingScriptHunter.RunBatch -anvil-out <file.json> -anvil-fail

Arg	Meaning
-anvil-out <file.json>	Output path. Default: <project>/AnvilReports/missing-scripts.json
-anvil-fail	Exit code 1 if any missing scripts were found; otherwise 0
-anvil-strip	After the scan, strip missing scripts on those assets, rescan them, and set "stripped": true. Without this flag, batch never strips.
-anvil-include <substr>	Repeatable. Keep only assets whose assetPath contains at least one include.
-anvil-exclude <substr>	Repeatable. Drop assets whose assetPath contains any exclude.

RunBatch only calls EditorApplication.Exit when Application.isBatchMode is true. It logs count=, assetsScanned=, modelsSkipped=, stripped=, and the output path.

Also accepts -anvil-out=file.json and -anvil-include=substr / -anvil-exclude=substr.

JSON

{
  "tool": "MissingScriptHunter",
  "generatedUtc": "2026-08-18T02:00:00Z",
  "count": 1,
  "assetsScanned": 12,
  "modelsSkipped": 3,
  "stripped": false,
  "errors": [
    {
      "assetPath": "Assets/Scenes/Broken.unity",
      "message": "Could not open scene."
    }
  ],
  "byAsset": [
    {
      "assetPath": "Assets/Scenes/Main.unity",
      "count": 1
    }
  ],
  "items": [
    {
      "assetPath": "Assets/Scenes/Main.unity",
      "kind": "scene",
      "objectPath": "Player/Weapon",
      "componentIndex": 3,
      "guid": "deadbeefdeadbeefdeadbeefdeadbeef"
    }
  ]
}

guid is "" when the YAML has no m_Script guid (binary assets, stripped prefab instances with no source, or a parse miss).

errors is filled when a scene or prefab fails to open; the rest of the scan continues. byAsset is a per-assetPath count of items. modelsSkipped counts FBX/OBJ/Blend/DAE and PrefabAssetType.Model prefabs that were not scanned.

Notes

• Prefabs are loaded with PrefabUtility.LoadPrefabContents / UnloadPrefabContents.
• Scenes: additive open+close in the Editor window (restores your previous setup); OpenSceneMode.Single in batch.
• Prefab instances in scenes are scanned live; GUIDs may be read from the source prefab YAML.
• Binary-serialized scenes/prefabs still list missing scripts; GUID may be empty.
• Model prefabs (.fbx, .obj, .blend, .dae, or PrefabAssetType.Model) are skipped.
• Empty projects and a missing AnvilReports folder are fine.
• Window strip registers Undo on loaded objects. Prefab assets are saved immediately (SaveAsPrefabAsset). Scenes opened only to strip are saved before close; scenes already loaded are marked dirty and left for you to save. Batch strip always saves.
• Does not touch runtime player code. Whole file is #if UNITY_EDITOR.