diff --git a/.changelog/next/fixed-issue-4284.md b/.changelog/next/fixed-issue-4284.md
new file mode 100644
index 0000000000..c2233203d3
--- /dev/null
+++ b/.changelog/next/fixed-issue-4284.md
@@ -0,0 +1 @@
+- [issue-4284] Worktree cleanup now reports canonical ownership reasons consistently.
diff --git a/server/services/worktreeManager.js b/server/services/worktreeManager.js
index 91c5990792..75f450e140 100644
--- a/server/services/worktreeManager.js
+++ b/server/services/worktreeManager.js
@@ -1114,13 +1114,7 @@ export async function reapMergedWorktrees(sourceWorkspace, {
       requireKnownLiveness: true,
     });
     if (ownershipReason) {
-      const reason = {
-        'worktree-human-claim': 'human-claim',
-        'worktree-active-agent': 'active-agent',
-        'worktree-locked': 'locked',
-        'worktree-unmanaged-location': 'unmanaged-location',
-      }[ownershipReason] || ownershipReason;
-      skipped.push({ path: wt.path, reason });
+      skipped.push({ path: wt.path, reason: ownershipReason });
       continue;
     }
     if (isClaudeTree && !includeClaudeTrees) { skipped.push({ path: wt.path, reason: 'claude-tree-excluded' }); continue; }
diff --git a/server/services/worktreeReap.test.js b/server/services/worktreeReap.test.js
index bd3d3aec9e..ac28d2a2fc 100644
--- a/server/services/worktreeReap.test.js
+++ b/server/services/worktreeReap.test.js
@@ -199,7 +199,7 @@ describe('reapMergedWorktrees', () => {
     const result = await reapMergedWorktrees(dir, { includeClaudeTrees: true });
 
     expect(result.reaped.map(r => r.branch)).not.toContain('locked-br');
-    expect(skipReason(result, path)).toBe('locked');
+    expect(skipReason(result, path)).toBe('worktree-locked');
     expect(existsSync(path)).toBe(true);
   });
 
@@ -213,7 +213,7 @@ describe('reapMergedWorktrees', () => {
     });
 
     expect(result.reaped.map(r => r.branch)).not.toContain('active-br');
-    expect(skipReason(result, path)).toBe('active-agent');
+    expect(skipReason(result, path)).toBe('worktree-active-agent');
     expect(existsSync(path)).toBe(true);
     // The main repo checkout is never reported as reaped or skipped-with-branch.
     expect(result.reaped.find(r => r.branch === 'main')).toBeUndefined();