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feat: add search_missing_references tool #1018

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69fce61
feat: add search_missing_references tool for scanning broken refs acr…
zafermg Apr 1, 2026
dd2560c
fix: address review feedback for search_missing_references
zafermg Apr 1, 2026
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386 changes: 386 additions & 0 deletions MCPForUnity/Editor/Tools/SearchMissingReferences.cs
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Original file line number Diff line number Diff line change
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using System.Collections.Generic;
using System.Linq;
using MCPForUnity.Editor.Helpers;
using Newtonsoft.Json.Linq;
using UnityEngine;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine.SceneManagement;

namespace MCPForUnity.Editor.Tools
{
[McpForUnityTool("search_missing_references")]
public static class SearchMissingReferences
{
private const int MaxIssueDetails = 5000;

public static object HandleCommand(JObject @params)
{
if (@params == null)
{
return new ErrorResponse("Parameters cannot be null.");
}

var p = new ToolParams(@params);
var pagination = PaginationRequest.FromParams(@params, defaultPageSize: 100);
pagination.PageSize = Mathf.Clamp(pagination.PageSize, 1, 500);
pagination.Cursor = Mathf.Max(0, pagination.Cursor);

string scope = p.Get("scope", "scene");
string pathFilter = p.Get("pathFilter");
string componentFilter = p.Get("componentFilter");
bool includeMissingScripts = p.GetBool("includeMissingScripts", true);
bool includeBrokenReferences = p.GetBool("includeBrokenReferences", true);
bool includeBrokenPrefabs = p.GetBool("includeBrokenPrefabs", true);
bool autoRepair = p.GetBool("autoRepair", false);

try
{
var allIssues = new List<object>();
int missingScripts = 0;
int brokenReferences = 0;
int brokenPrefabs = 0;
int repaired = 0;
bool sceneDirty = false;
bool assetsDirty = false;

if (scope == "scene")
{
var activeScene = SceneManager.GetActiveScene();
if (!activeScene.IsValid() || !activeScene.isLoaded)
{
return new ErrorResponse("No active scene found.");
}

foreach (var root in activeScene.GetRootGameObjects())
{
foreach (var transform in root.GetComponentsInChildren<Transform>(true))
{
ScanGameObject(
transform.gameObject,
GetGameObjectPath(transform.gameObject),
includeMissingScripts,
includeBrokenReferences,
includeBrokenPrefabs,
componentFilter,
autoRepair,
allIssues,
ref missingScripts,
ref brokenReferences,
ref brokenPrefabs,
ref repaired,
ref sceneDirty,
ref assetsDirty,
isProjectAsset: false);
}
}

if (sceneDirty)
{
EditorSceneManager.MarkSceneDirty(activeScene);
}
}
else if (scope == "project")
{
string[] searchInFolders = string.IsNullOrWhiteSpace(pathFilter)
? null
: new[] { pathFilter };

var guids = AssetDatabase.FindAssets("t:Prefab t:ScriptableObject t:Material", searchInFolders)
.Distinct()
.ToArray();

foreach (var guid in guids)
{
string assetPath = AssetDatabase.GUIDToAssetPath(guid);
if (string.IsNullOrEmpty(assetPath))
{
continue;
}

var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(assetPath);
if (prefab != null)
{
foreach (var transform in prefab.GetComponentsInChildren<Transform>(true))
{
ScanGameObject(
transform.gameObject,
assetPath,
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includeMissingScripts,
includeBrokenReferences,
includeBrokenPrefabs,
componentFilter,
autoRepair,
allIssues,
ref missingScripts,
ref brokenReferences,
ref brokenPrefabs,
ref repaired,
ref sceneDirty,
ref assetsDirty,
isProjectAsset: true);
}
continue;
}

var scriptableObject = AssetDatabase.LoadAssetAtPath<ScriptableObject>(assetPath);
if (scriptableObject != null)
{
ScanSerializedObject(
scriptableObject,
assetPath,
scriptableObject.GetType().Name,
includeBrokenReferences,
componentFilter,
allIssues,
ref brokenReferences);
continue;
}

var material = AssetDatabase.LoadAssetAtPath<Material>(assetPath);
if (material != null)
{
ScanSerializedObject(
material,
assetPath,
material.GetType().Name,
includeBrokenReferences,
componentFilter,
allIssues,
ref brokenReferences);
}
}

if (assetsDirty)
{
AssetDatabase.SaveAssets();
}
}
else
{
return new ErrorResponse("Invalid 'scope'. Expected 'scene' or 'project'.");
}

int totalIssues = missingScripts + brokenReferences + brokenPrefabs;
int totalCount = allIssues.Count;
int cursor = Mathf.Clamp(pagination.Cursor, 0, totalCount);
var pagedIssues = allIssues.Skip(cursor).Take(pagination.PageSize).ToList();
int endIndex = cursor + pagedIssues.Count;
int? nextCursor = endIndex < totalCount ? endIndex : (int?)null;

string note = autoRepair
? "Auto-repair removes missing scripts only. Broken references and broken prefab links are reported but not auto-repaired."
: "Broken references and broken prefab links are not auto-repaired.";

return new SuccessResponse("Missing reference search completed.", new
{
scope,
totalIssues,
missingScripts,
brokenReferences,
brokenPrefabs,
repaired,
issues = pagedIssues,
pageSize = pagination.PageSize,
cursor,
nextCursor,
hasMore = nextCursor.HasValue,
totalCount,
truncated = totalIssues > allIssues.Count,
note
});
}
catch (System.Exception ex)
{
McpLog.Error($"[SearchMissingReferences] Error searching missing references: {ex.Message}");
return new ErrorResponse($"Error searching missing references: {ex.Message}");
}
}

private static void ScanGameObject(
GameObject go,
string path,
bool includeMissingScripts,
bool includeBrokenReferences,
bool includeBrokenPrefabs,
string componentFilter,
bool autoRepair,
List<object> issues,
ref int missingScripts,
ref int brokenReferences,
ref int brokenPrefabs,
ref int repaired,
ref bool sceneDirty,
ref bool assetsDirty,
bool isProjectAsset)
{
if (go == null)
{
return;
}

bool hasComponentFilter = !string.IsNullOrWhiteSpace(componentFilter);

if (includeMissingScripts && !hasComponentFilter)
{
int missing = GameObjectUtility.GetMonoBehavioursWithMissingScriptCount(go);
if (missing > 0)
{
missingScripts += missing;
if (issues.Count < MaxIssueDetails)
{
issues.Add(new
{
type = "missing_script",
gameObject = go.name,
path,
component = "MissingMonoBehaviour",
property = "m_Script",
count = missing
});
}

if (autoRepair)
{
Undo.RegisterCompleteObjectUndo(go, "Remove Missing Scripts");
int removed = GameObjectUtility.RemoveMonoBehavioursWithMissingScript(go);
if (removed > 0)
{
repaired += removed;
if (isProjectAsset)
{
EditorUtility.SetDirty(go);
assetsDirty = true;
}
else
{
sceneDirty = true;
}
}
}
}
}

if (includeBrokenPrefabs && !hasComponentFilter)
{
var prefabStatus = PrefabUtility.GetPrefabInstanceStatus(go);
if (prefabStatus == PrefabInstanceStatus.MissingAsset)
{
brokenPrefabs++;
if (issues.Count < MaxIssueDetails)
{
issues.Add(new
{
type = "broken_prefab",
gameObject = go.name,
path,
component = "PrefabInstance",
property = "prefabAsset",
count = 1
});
}
}
}

if (!includeBrokenReferences)
{
return;
}

foreach (var component in go.GetComponents<Component>())
{
if (component == null)
{
continue;
}

string componentTypeName = component.GetType().Name;
if (hasComponentFilter && componentTypeName != componentFilter)
{
continue;
}

ScanSerializedObject(
component,
path,
componentTypeName,
includeBrokenReferences,
componentFilter,
issues,
ref brokenReferences,
go.name);
}
}

private static void ScanSerializedObject(
Object obj,
string path,
string componentTypeName,
bool includeBrokenReferences,
string componentFilter,
List<object> issues,
ref int brokenReferences,
string gameObjectName = null)
{
if (!includeBrokenReferences || obj == null)
{
return;
}

if (!string.IsNullOrWhiteSpace(componentFilter) && componentTypeName != componentFilter)
{
return;
}

var serializedObject = new SerializedObject(obj);
var property = serializedObject.GetIterator();

while (property.NextVisible(true))
{
if (property.propertyType != SerializedPropertyType.ObjectReference)
{
continue;
}

if (property.objectReferenceValue != null || property.objectReferenceInstanceIDValue == 0)
{
continue;
}

brokenReferences++;
if (issues.Count < MaxIssueDetails)
{
issues.Add(new
{
type = "broken_reference",
gameObject = gameObjectName ?? obj.name,
path,
component = componentTypeName,
property = property.propertyPath,
count = 1
});
}
}
}

private static string GetGameObjectPath(GameObject go)
{
if (go == null) return string.Empty;
try
{
var names = new Stack<string>();
Transform t = go.transform;
while (t != null)
{
names.Push(t.name);
t = t.parent;
}
return string.Join("/", names);
}
catch
{
return go.name;
}
}
}
}
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