init

utils/zodToJsonSchema.ts

@@ -0,0 +1,23 @@
+/**
+ * Converts Zod v4 schemas to JSON Schema using native toJSONSchema.
+ */
+
+import { toJSONSchema, type ZodTypeAny } from 'zod/v4'
+
+export type JsonSchema7Type = Record<string, unknown>
+
+// toolToAPISchema() runs this for every tool on every API request (~60-250
+// times/turn). Tool schemas are wrapped with lazySchema() which guarantees the
+// same ZodTypeAny reference per session, so we can cache by identity.
+const cache = new WeakMap<ZodTypeAny, JsonSchema7Type>()
+
+/**
+ * Converts a Zod v4 schema to JSON Schema format.
+ */
+export function zodToJsonSchema(schema: ZodTypeAny): JsonSchema7Type {
+  const hit = cache.get(schema)
+  if (hit) return hit
+  const result = toJSONSchema(schema) as JsonSchema7Type
+  cache.set(schema, result)
+  return result
+}