From 07faebe1a43a0266fea0f40b35659b416f8842da Mon Sep 17 00:00:00 2001
From: TheEterna <125226601+TheEterna@users.noreply.github.com>
Date: Tue, 17 Jun 2025 16:23:45 +0800
Subject: [PATCH] fixed #3559 Modify the DefaultToolCallResultConverter.convert
 method and add the Mono processing code

Signed-off-by: TheEterna <125226601+TheEterna@users.noreply.github.com>
---
 .../ai/tool/execution/DefaultToolCallResultConverter.java   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/spring-ai-model/src/main/java/org/springframework/ai/tool/execution/DefaultToolCallResultConverter.java b/spring-ai-model/src/main/java/org/springframework/ai/tool/execution/DefaultToolCallResultConverter.java
index dcbc5fcab97..13f9f8179c5 100644
--- a/spring-ai-model/src/main/java/org/springframework/ai/tool/execution/DefaultToolCallResultConverter.java
+++ b/spring-ai-model/src/main/java/org/springframework/ai/tool/execution/DefaultToolCallResultConverter.java
@@ -27,6 +27,7 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Mono;
 
 import org.springframework.ai.util.json.JsonParser;
 import org.springframework.lang.Nullable;
@@ -47,6 +48,11 @@ public String convert(@Nullable Object result, @Nullable Type returnType) {
 			logger.debug("The tool has no return type. Converting to conventional response.");
 			return JsonParser.toJson("Done");
 		}
+		// handle results of Mono type
+		if (result instanceof Mono<?>) {
+			result = ((Mono<?>) result).block();
+		}
+
 		if (result instanceof RenderedImage) {
 			final var buf = new ByteArrayOutputStream(1024 * 4);
 			try {