fix(dashscope): avoid 400 for non-streaming qwen3.5 multimodal requests

[rrrjqy66]

Fixes #984

AgentScope-Java Version

1.0.11

Description

Background

When DashScopeChatModel is used with qwen3.5-plus in non-streaming mode, DashScope may return HTTP 400.

At first glance this can look like an endpoint routing issue, but the multimodal endpoint is actually correct here. According to DashScope's Qwen 3.5 model behavior, qwen3.5-plus should still be treated as a multimodal model. The real problem is that Qwen 3.5 enables thinking by default, while thinking mode requires streaming. In the previous implementation, when stream=false and enableThinking was not explicitly set, the request did not explicitly disable thinking, which could cause DashScope to reject the request.

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[Copilot]

Pull request overview

Fixes DashScope HTTP 400 errors for non-streaming qwen3.5-* requests by explicitly disabling the model’s default “thinking mode” when streaming is off, and adds regression tests to ensure the correct endpoint and request parameters are used.

Changes:

• In DashScopeChatModel, auto-disable enable_thinking for non-streaming requests when using qwen3.5-* models (unless explicitly configured).
• Add unit/integration-style tests to verify thinking is opted out and the multimodal endpoint is selected for qwen3.5-plus non-streaming calls.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
agentscope-core/src/main/java/io/agentscope/core/model/DashScopeChatModel.java	Adds model-name detection and forces enableThinking=false for non-streaming qwen3.5-* defaults.
agentscope-core/src/test/java/io/agentscope/core/model/DashScopeChatModelTest.java	Adds regression tests covering non-stream qwen3.5 thinking opt-out and multimodal endpoint selection.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...a/io/agentscope/core/model/DashScopeChatModel.java	66.66%	1 Missing and 1 partial ⚠️

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[rrrjqy66]

Wrap shutdown() in a try-finally block