remove null format (#7402)

frontend/src/lib/components/copilot/chat/shared.ts

@@ -571,6 +571,46 @@ export const createSearchHubScriptsTool = (withContent: boolean = false) => ({
 	}
 })
 
+/**
+ * Recursively removes format: null or format: '' from a JSON schema object
+ */
+function removeNullFormats(schema: Record<string, any> | undefined): void {
+	if (!schema || typeof schema !== 'object') {
+		return
+	}
+
+	// Remove format if it's null or empty string
+	if (schema.format === null || schema.format === '') {
+		delete schema.format
+	}
+
+	// Recurse into properties
+	if (schema.properties && typeof schema.properties === 'object') {
+		for (const key of Object.keys(schema.properties)) {
+			removeNullFormats(schema.properties[key])
+		}
+	}
+
+	// Recurse into items (for arrays)
+	if (schema.items) {
+		removeNullFormats(schema.items)
+	}
+
+	// Recurse into additionalProperties if it's an object schema
+	if (schema.additionalProperties && typeof schema.additionalProperties === 'object') {
+		removeNullFormats(schema.additionalProperties)
+	}
+
+	// Recurse into allOf, anyOf, oneOf
+	for (const key of ['allOf', 'anyOf', 'oneOf']) {
+		if (Array.isArray(schema[key])) {
+			for (const subSchema of schema[key]) {
+				removeNullFormats(subSchema)
+			}
+		}
+	}
+}
+
 export async function buildSchemaForTool(
 	toolDef: ChatCompletionFunctionTool,
 	schemaBuilder: () => Promise<FunctionParameters>
@@ -588,6 +628,10 @@ export async function buildSchemaForTool(
 		}
 
 		toolDef.function.parameters = { ...schema, additionalProperties: false }
+
+		// recursively remove any format: null or format: '' (empty string) from schema
+		removeNullFormats(toolDef.function.parameters)
+
 		// OPEN AI models don't support strict mode well with schema with complex properties, so we disable it
 		const model = getCurrentModel()
 		if (model.provider === 'openai' || model.provider === 'azure_openai') {