Strip incompatible JSON Schema keywords from tool schemas

src/utils/schemaSanitizer.ts

@@ -0,0 +1,30 @@
+/**
+ * Anthropic-compatible tool schemas reject several JSON Schema keywords that
+ * Zod commonly emits, especially string `format` validators like `uri`.
+ * Strip those fields recursively before sending tool schemas to providers.
+ */
+export function stripIncompatibleSchemaKeywords<T>(
+  schema: T,
+): T {
+  if (Array.isArray(schema)) {
+    return schema.map(item => stripIncompatibleSchemaKeywords(item)) as T
+  }
+
+  if (!schema || typeof schema !== 'object') {
+    return schema
+  }
+
+  const result: Record<string, unknown> = {}
+  for (const [key, value] of Object.entries(schema as Record<string, unknown>)) {
+    if (key === '$schema' || key === 'format' || key === 'propertyNames') {
+      continue
+    }
+
+    result[key] =
+      value && typeof value === 'object'
+        ? stripIncompatibleSchemaKeywords(value)
+        : value
+  }
+
+  return result as T
+}