diff --git a/packages/hypergraph/src/entity/findMany.ts b/packages/hypergraph/src/entity/findMany.ts
index cf5f6a7d..086b9987 100644
--- a/packages/hypergraph/src/entity/findMany.ts
+++ b/packages/hypergraph/src/entity/findMany.ts
@@ -256,13 +256,13 @@ export function findMany<const S extends AnyNoContext>(
 
   const evaluateFilter = <T>(fieldFilter: EntityFieldFilter<T>, fieldValue: T): boolean => {
     // Handle NOT operator
-    if ('NOT' in fieldFilter && fieldFilter.NOT) {
-      return !evaluateFilter(fieldFilter.NOT, fieldValue);
+    if ('not' in fieldFilter && fieldFilter.not) {
+      return !evaluateFilter(fieldFilter.not, fieldValue);
     }
 
     // Handle OR operator
-    if ('OR' in fieldFilter) {
-      const orFilters = fieldFilter.OR;
+    if ('or' in fieldFilter) {
+      const orFilters = fieldFilter.or;
       if (Array.isArray(orFilters)) {
         return orFilters.some((orFilter) => evaluateFilter(orFilter as EntityFieldFilter<T>, fieldValue));
       }
@@ -337,13 +337,13 @@ export function findMany<const S extends AnyNoContext>(
 
   const evaluateEntityFilter = (entityFilter: EntityFilter<Schema.Schema.Type<S>>, entity: Entity<S>): boolean => {
     // handle top-level NOT operator
-    if ('NOT' in entityFilter && entityFilter.NOT) {
-      return !evaluateCrossFieldFilter(entityFilter.NOT, entity);
+    if ('not' in entityFilter && entityFilter.not) {
+      return !evaluateCrossFieldFilter(entityFilter.not, entity);
     }
 
     // handle top-level OR operator
-    if ('OR' in entityFilter && Array.isArray(entityFilter.OR)) {
-      return entityFilter.OR.some((orFilter) => evaluateCrossFieldFilter(orFilter, entity));
+    if ('or' in entityFilter && Array.isArray(entityFilter.or)) {
+      return entityFilter.or.some((orFilter) => evaluateCrossFieldFilter(orFilter, entity));
     }
 
     // evaluate regular field filters
diff --git a/packages/hypergraph/src/entity/types.ts b/packages/hypergraph/src/entity/types.ts
index 0e51a71d..546a493a 100644
--- a/packages/hypergraph/src/entity/types.ts
+++ b/packages/hypergraph/src/entity/types.ts
@@ -55,8 +55,8 @@ export type EntityNumberFilter = {
   is?: number;
   greaterThan?: number;
   lessThan?: number;
-  NOT?: EntityNumberFilter;
-  OR?: EntityNumberFilter[];
+  not?: EntityNumberFilter;
+  or?: EntityNumberFilter[];
 };
 
 export type EntityTextFilter = {
@@ -65,21 +65,21 @@ export type EntityTextFilter = {
   endsWith?: string;
   contains?: string;
   equals?: string;
-  NOT?: EntityTextFilter;
-  OR?: EntityTextFilter[];
+  not?: EntityTextFilter;
+  or?: EntityTextFilter[];
 };
 
 export type CrossFieldFilter<T> = {
   [K in keyof T]?: EntityFieldFilter<T[K]>;
 } & {
-  OR?: Array<CrossFieldFilter<T>>;
-  NOT?: CrossFieldFilter<T>;
+  or?: Array<CrossFieldFilter<T>>;
+  not?: CrossFieldFilter<T>;
 };
 
 export type EntityFieldFilter<T> = {
   is?: T;
-  NOT?: EntityFieldFilter<T>;
-  OR?: Array<EntityFieldFilter<T>>;
+  not?: EntityFieldFilter<T>;
+  or?: Array<EntityFieldFilter<T>>;
 } & (T extends boolean
   ? {
       is?: boolean;
diff --git a/packages/hypergraph/test/entity/findMany.test.ts b/packages/hypergraph/test/entity/findMany.test.ts
index fd0b4094..cc0e79b3 100644
--- a/packages/hypergraph/test/entity/findMany.test.ts
+++ b/packages/hypergraph/test/entity/findMany.test.ts
@@ -194,7 +194,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          name: { NOT: { is: 'John' } },
+          name: { not: { is: 'John' } },
         },
         undefined,
       );
@@ -213,7 +213,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          age: { NOT: { is: 30 } },
+          age: { not: { is: 30 } },
         },
         undefined,
       );
@@ -234,7 +234,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          name: { OR: [{ is: 'John' }, { is: 'Jane' }] },
+          name: { or: [{ is: 'John' }, { is: 'Jane' }] },
         },
         undefined,
       );
@@ -253,7 +253,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          age: { OR: [{ is: 25 }, { is: 40 }] },
+          age: { or: [{ is: 25 }, { is: 40 }] },
         },
         undefined,
       );
@@ -274,7 +274,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          name: { NOT: { OR: [{ is: 'John' }, { is: 'Jane' }] } },
+          name: { not: { or: [{ is: 'John' }, { is: 'Jane' }] } },
         },
         undefined,
       );
@@ -293,7 +293,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          name: { NOT: { OR: [{ is: 'John' }, { is: 'Jane' }] } },
+          name: { not: { or: [{ is: 'John' }, { is: 'Jane' }] } },
         },
         undefined,
       );
@@ -314,7 +314,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          OR: [{ name: { contains: 'o' } }, { age: { greaterThan: 35 } }],
+          or: [{ name: { contains: 'o' } }, { age: { greaterThan: 35 } }],
         },
         undefined,
       );
@@ -333,7 +333,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          NOT: {
+          not: {
             name: { startsWith: 'J' },
             age: { lessThan: 30 },
           },
@@ -356,7 +356,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          OR: [
+          or: [
             {
               name: { startsWith: 'J' },
               age: { lessThan: 30 },
@@ -385,8 +385,8 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          name: { NOT: { startsWith: 'J' } },
-          age: { NOT: { greaterThan: 35 } },
+          name: { not: { startsWith: 'J' } },
+          age: { not: { greaterThan: 35 } },
         },
         undefined,
       );
@@ -407,7 +407,7 @@ describe('findMany with filters', () => {
         handle,
         Product,
         {
-          OR: [
+          or: [
             {
               category: { is: 'Electronics' },
               price: { greaterThan: 800 },
@@ -436,7 +436,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          OR: [{ name: { startsWith: 'J' } }, { name: { contains: 'i' } }],
+          or: [{ name: { startsWith: 'J' } }, { name: { contains: 'i' } }],
           isActive: { is: true },
         },
         undefined,
@@ -457,7 +457,7 @@ describe('findMany with filters', () => {
         handle,
         Person,
         {
-          NOT: { name: { startsWith: 'J' } },
+          not: { name: { startsWith: 'J' } },
           age: { greaterThan: 30 },
         },
         undefined,