fix: default OpenAI Compatible provider to XML protocol for better third-party proxy compatibility

[roomote]

This PR attempts to address Issue #10259.

Problem

In version 3.36.15, PR #10213 introduced a change that merges native tool defaults (supportsNativeTools: true, defaultToolProtocol: "native") for the OpenAI Compatible provider. This caused a regression where users with custom model configurations (like DeepSeek-R1 via LiteLLM proxy) who did not explicitly set defaultToolProtocol would now receive native tool calls, which many third-party proxies do not support.

The error manifests as: 500 Internal server error: Unsupported tool_call_parser: None

Solution

Change openAiModelInfoSaneDefaults.defaultToolProtocol from "native" to "xml" for the OpenAI Compatible provider.

This ensures better compatibility with third-party proxies by defaulting to XML-based tool calling. Users who want native tool calling can still explicitly enable it in Advanced Settings.

Changes

• packages/types/src/providers/openai.ts: Changed defaultToolProtocol from "native" to "xml" for openAiModelInfoSaneDefaults
• Updated tests in src/utils/__tests__/resolveToolProtocol.spec.ts
• Updated tests in webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts

Feedback and guidance are welcome.

[roomote]

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Review complete. No issues found.

The change correctly defaults the OpenAI Compatible provider to XML protocol for better third-party proxy compatibility, addressing the regression from PR #10213. The tests have been appropriately updated, and other providers (LM Studio, VSCode LM, Claude Code) are unaffected since they define their own defaultToolProtocol.

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