diff --git a/.changeset/olive-tigers-sniff.md b/.changeset/olive-tigers-sniff.md
new file mode 100644
index 000000000..e1052a64a
--- /dev/null
+++ b/.changeset/olive-tigers-sniff.md
@@ -0,0 +1,7 @@
+---
+"@osdk/generator-converters": minor
+"@osdk/client.api": minor
+"@osdk/api": minor
+---
+
+Fix primary key types
diff --git a/etc/client.api.report.api.md b/etc/client.api.report.api.md
index 6675d053b..8cb8ea24b 100644
--- a/etc/client.api.report.api.md
+++ b/etc/client.api.report.api.md
@@ -483,7 +483,7 @@ export type Osdk<Q extends ObjectTypeDefinition<any> | InterfaceDefinition<any,
     __apiName: Q["apiName"] & {
         __OsdkType?: Q["apiName"];
     };
-    __primaryKey: Q extends ObjectTypeDefinition<any> ? OsdkObjectPrimaryKeyType<Q> : unknown;
+    __primaryKey: Q extends ObjectTypeDefinition<any> ? OsdkObjectPrimaryKeyType<Q> : string | number | boolean;
     $link: Q extends ObjectTypeDefinition<any> ? OsdkObjectLinksObject<Q> : never;
     $as: <NEW_Q extends ValidToFrom<Q>>(type: NEW_Q | string) => Osdk<NEW_Q, ConvertProps<Q, NEW_Q, P>, UnderlyingProps<Q, P, Z, NEW_Q>>;
 } & (IsNever<P> extends true ? {} : string extends P ? {} : "$rid" extends P ? {
diff --git a/packages/api/src/index.ts b/packages/api/src/index.ts
index 4d6df50c7..fa50c0a5d 100644
--- a/packages/api/src/index.ts
+++ b/packages/api/src/index.ts
@@ -58,6 +58,7 @@ export type {
 } from "./ontology/ObjectTypeDefinition.js";
 export type { OntologyDefinition } from "./ontology/OntologyDefinition.js";
 export type { OntologyMetadata } from "./ontology/OntologyMetadata.js";
+export type { PrimaryKeyTypes } from "./ontology/PrimaryKeyTypes.js";
 export type {
   AggregationKeyDataType,
   ObjectQueryDataType,
diff --git a/packages/api/src/ontology/ObjectTypeDefinition.ts b/packages/api/src/ontology/ObjectTypeDefinition.ts
index 8622078c1..3798e6d4b 100644
--- a/packages/api/src/ontology/ObjectTypeDefinition.ts
+++ b/packages/api/src/ontology/ObjectTypeDefinition.ts
@@ -17,6 +17,7 @@
 import type { ObjectOrInterfaceDefinition } from "../index.js";
 import type { OsdkMetadata } from "../OsdkMetadata.js";
 import type { OntologyDefinition } from "./OntologyDefinition.js";
+import type { PrimaryKeyTypes } from "./PrimaryKeyTypes.js";
 import type { VersionString } from "./VersionString.js";
 import type { WirePropertyTypes } from "./WirePropertyTypes.js";
 
@@ -79,7 +80,7 @@ export interface ObjectTypeDefinition<
 > extends ObjectInterfaceBaseDefinition<K, N> {
   type: "object";
   primaryKeyApiName: keyof this["properties"];
-  primaryKeyType: WirePropertyTypes;
+  primaryKeyType: PrimaryKeyTypes;
 
   /**
    * Optional because they may not exist on legacy.
diff --git a/packages/api/src/ontology/PrimaryKeyTypes.ts b/packages/api/src/ontology/PrimaryKeyTypes.ts
new file mode 100644
index 000000000..546c71832
--- /dev/null
+++ b/packages/api/src/ontology/PrimaryKeyTypes.ts
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2023 Palantir Technologies, Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export type PrimaryKeyTypes =
+  | "string"
+  | "datetime"
+  | "double"
+  | "boolean"
+  | "integer"
+  | "timestamp"
+  | "short"
+  | "long"
+  | "byte";
diff --git a/packages/client.api/src/OsdkObjectFrom.ts b/packages/client.api/src/OsdkObjectFrom.ts
index ac24d3ac9..97ceb8ca8 100644
--- a/packages/client.api/src/OsdkObjectFrom.ts
+++ b/packages/client.api/src/OsdkObjectFrom.ts
@@ -139,7 +139,7 @@ export type Osdk<
     /** @deprecated use $primaryKey */
     __primaryKey: Q extends ObjectTypeDefinition<any>
       ? OsdkObjectPrimaryKeyType<Q>
-      : unknown;
+      : string | number | boolean;
 
     // $uniqueId: string; // will be dynamic
 
diff --git a/packages/generator-converters/src/wirePropertyV2ToSdkPrimaryKeyTypeDefinition.ts b/packages/generator-converters/src/wirePropertyV2ToSdkPrimaryKeyTypeDefinition.ts
index d520fa7b5..fa4e72dc3 100644
--- a/packages/generator-converters/src/wirePropertyV2ToSdkPrimaryKeyTypeDefinition.ts
+++ b/packages/generator-converters/src/wirePropertyV2ToSdkPrimaryKeyTypeDefinition.ts
@@ -14,23 +14,18 @@
  * limitations under the License.
  */
 
-import type { WirePropertyTypes } from "@osdk/api";
+import type { PrimaryKeyTypes } from "@osdk/api";
 import type { PropertyV2 } from "@osdk/gateway/types";
 
 export function wirePropertyV2ToSdkPrimaryKeyTypeDefinition(
   input: PropertyV2,
-): WirePropertyTypes {
+): PrimaryKeyTypes {
   switch (input.dataType.type) {
     case "integer":
     case "double":
     case "string":
     case "boolean":
-    case "attachment":
     case "byte":
-    case "decimal":
-    case "float":
-    case "geopoint":
-    case "geoshape":
     case "long":
     case "short": {
       return input.dataType.type;
@@ -41,9 +36,14 @@ export function wirePropertyV2ToSdkPrimaryKeyTypeDefinition(
     case "timestamp": {
       return "timestamp";
     }
+    case "geopoint":
+    case "geoshape":
+    case "decimal":
+    case "attachment":
     case "timeseries":
     case "array":
     case "marking":
+    case "float":
       throw new Error(
         `Type not supported for primaryKey: ${input.dataType.type}`,
       );