diff --git a/.sisyphus/plans/modifier-profiles-t3.md b/.sisyphus/plans/modifier-profiles-t3.md
index 6d55808..442cea7 100644
--- a/.sisyphus/plans/modifier-profiles-t3.md
+++ b/.sisyphus/plans/modifier-profiles-t3.md
@@ -357,7 +357,7 @@ Wave FINAL (4 parallel reviewers):
 
   **Commits**: `feat(engine): {kind} effect primitive` (×15)
 
-- [ ] 19. **Custom descriptor validator**
+- [x] 19. **Custom descriptor validator**
 
   **What to do**: `packages/chess/src/modifiers/custom/validate.ts` — validates a CustomModifierDescriptor:
   - Every primitive kind is in PRIMITIVE_REGISTRY
@@ -372,7 +372,7 @@ Wave FINAL (4 parallel reviewers):
 
   **Commit**: `feat(engine): custom modifier descriptor validator`
 
-- [ ] 20. **Zod schema for custom descriptor serialization**
+- [x] 20. **Zod schema for custom descriptor serialization**
 
   **Recommended Agent Profile**: `unspecified-low`
 
@@ -380,7 +380,7 @@ Wave FINAL (4 parallel reviewers):
 
   **Commit**: `feat(engine): custom modifier Zod schema`
 
-- [ ] 21. **Custom modifier library persistence**
+- [x] 21. **Custom modifier library persistence**
 
   **What to do**: `packages/chess/src/modifiers/custom/library.ts` — localStorage at `houserules:custom-modifiers:v1`. Mirror T1 library API.
 
@@ -390,7 +390,7 @@ Wave FINAL (4 parallel reviewers):
 
   **Commit**: `feat(engine): custom modifier library persistence`
 
-- [ ] 22. **Engine integration — applyCustomDescriptor**
+- [x] 22. **Engine integration — applyCustomDescriptor**
 
   **What to do**: `packages/chess/src/modifiers/custom/apply.ts` — when a profile's perType/perInstance entry references a custom kind, resolve the descriptor from per-engine registry, execute its primitive list on the target piece.
 
@@ -400,7 +400,7 @@ Wave FINAL (4 parallel reviewers):
 
   **Commit**: `feat(engine): apply custom modifier descriptors`
 
-- [ ] 23. **Multi-profile stacking in apply/reconcile**
+- [x] 23. **Multi-profile stacking in apply/reconcile**
 
   **What to do**: Extend `applyProfileToSession` → `applyProfilesToSession(session, profiles, layout)`. Extend `reconcileProfileSwap` → `reconcileProfilesSwap(session, oldProfiles, newProfiles, layout)`. Stacking per ADR-4 rules apply across multiple profiles.