Spring AI Multiple tools with the same name in reactive mode

Bug description I found an issue when making MCP calls, where an error occurs when the requesting controller returns Flux<> in reactive mode

java.lang.IllegalStateException: Multiple tools with the same name (getDayOfWeek, getCurrentDate) found in ToolCallingChatOptions
    at org.springframework.ai.model.tool.ToolCallingChatOptions.validateToolCallbacks(ToolCallingChatOptions.java:227) ~[spring-ai-core-1.0.0-M6.jar:1.0.0-M6]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:

Environment java: oracle openJDK17 Spring AI: 1.0.0-M6 LM Studio: 0.3.12 Model: Qwen2.5

Steps to reproduce

cd spring-mcp-test
mvn clean package
java -jar mcp-server/target/mcp-server.jar
java -jar mcp-client/target/mcp-client.jar

curl http://localhost:8080/ai/mcp?message=listfiles

Expected behavior Some information about files.

Minimal Complete Reproducible example Check out the project https://github.com/fxz26284407/spring-mcp-test

Comment From: Willam2004

I have the same problem. i try to debug for reason because open the mcp client have two instance.

and also use the Spring AI: 1.0.0-M6

Comment From: tzolov

Resolved by 3f7f2f1bffade3d6029dc6bca9631033533273d8 and 957150128b13c03e0381941b18eb56df8979ddf6 Feel free to re-open if the issue is still present.

Comment From: aliyun1024qjc

Issue Description

When using Spring AI 1.0.0-M6, I noticed a difference in behavior between SYNC and ASYNC modes regarding tool registration:

With type: ASYNC: The application starts successfully even with duplicate tools
With type: SYNC: The application throws Multiple tools with the same name exception

This seems related to issue #2422, which was marked as resolved. However, the behavior difference between SYNC and ASYNC modes might need further investigation.

Spring AI Multiple tools with the same name in reactive mode

Issue Description

Environment

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Error Message