diff --git a/src/entrypoints/sdk/toolTypes.ts b/src/entrypoints/sdk/toolTypes.ts
old mode 100755
new mode 100644
index 336ce12..0010af9
--- a/src/entrypoints/sdk/toolTypes.ts
+++ b/src/entrypoints/sdk/toolTypes.ts
@@ -1 +1,22 @@
-export {}
+import type { CallToolResult, ToolAnnotations } from '@modelcontextprotocol/sdk/types.js'
+
+import type { AnyZodRawShape, InferShape, SdkMcpToolDefinition } from './runtimeTypes.ts'
+
+export type { AnyZodRawShape, InferShape, SdkMcpToolDefinition }
+
+export type SdkMcpToolHandler<Schema extends AnyZodRawShape> = (
+  args: InferShape<Schema>,
+  extra: unknown,
+) => Promise<CallToolResult>
+
+export type SdkMcpToolExtras = {
+  annotations?: ToolAnnotations
+  searchHint?: string
+  alwaysLoad?: boolean
+}
+
+export type SdkMcpToolDescriptor<Schema extends AnyZodRawShape> = Pick<
+  SdkMcpToolDefinition<Schema>,
+  'name' | 'description' | 'inputSchema' | 'handler'
+> &
+  SdkMcpToolExtras