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fix: support <thought> tag rendering for Gemma 4 reasoning - #12096
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Gemma 4 31B uses <thought>...</thought> tags for its reasoning process, but Roo Code only recognized <think>...</think> tags. This change: - Updates TagMatcher to accept multiple tag names (string | string[]) - Adds "thought" as an additional recognized reasoning tag in all 4 providers (openai, base-openai-compatible, lm-studio, native-ollama) - Strips <thought> tags in presentAssistantMessage alongside <thinking> - Adds comprehensive test coverage for multi-tag matching Fixes #12093
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This PR attempts to address Issue #12093.
Problem
Gemma 4 31B outputs its reasoning process with
<thought>...</thought>tags, but Roo Code only recognized<think>...</think>tags for reasoning extraction. This caused the raw<thought>tags to appear in the chat UI instead of being rendered as reasoning content.Changes
src/utils/tag-matcher.ts- UpdatedTagMatcherto acceptstring | string[]for tag names, enabling multi-tag matching during streaming. When multiple tag names are provided, the matcher tracks candidate matches character-by-character and ensures close tags match their corresponding open tags.Provider updates (4 files) - Updated all
TagMatcherinstantiation sites to recognize both"think"and"thought"tags:src/api/providers/openai.tssrc/api/providers/base-openai-compatible-provider.tssrc/api/providers/lm-studio.tssrc/api/providers/native-ollama.tssrc/core/assistant-message/presentAssistantMessage.ts- Added stripping of<thought>/</thought>tags alongside the existing<thinking>tag stripping.src/utils/__tests__/tag-matcher.spec.ts- Added 13 tests covering single tag, multi-tag, streaming, mismatched tag, and transform scenarios.Testing
Feedback and guidance are welcome.
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