* fix: preserve text before tool-call XML in forced-text responses (#789)
Local models (Qwen3, DeepSeek, GLM) emit <tool_call> XML even when no
tools are available (force_text mode). The existing strip_xml_tag()
discards everything from an unclosed opening tag onward, producing an
empty string that triggers the "I'm not sure how to respond" fallback.
Add truncate_at_tool_tags() — a code-region-aware pre-processing step
that truncates at the first tool-call XML tag BEFORE clean_response()
runs, preserving all useful text before the tag. Protect all 7
clean_response() call sites. Case-insensitive matching handles models
that emit <TOOL_CALL> or <Tool_Call> variants.
Secondary fix: add has_native_thinking() model detection to skip
<think>/<final> system prompt injection for models with built-in
reasoning (Qwen3, QwQ, DeepSeek-R1, GLM-Z1, etc.), preventing
thinking-only responses that clean to empty.
Wire with_model_name(active_model_name()) at all 9 production sites
that construct Reasoning, so the runtime model name (not static config)
drives system prompt generation.
126 new/updated tests covering truncation edge cases, code-block
awareness, Unicode, case-insensitivity, StubLlm integration for
complete/plan/evaluate_success/respond_with_tools paths, model
detection, and conditional system prompt generation.
Closes#789
Co-Authored-By: Claude Opus 4.6 <[email protected]>
* fix: address Copilot review — unclosed-only truncation, ASCII case folding
- truncate_at_tool_tags() now only truncates at UNCLOSED tool tags;
properly closed tags (e.g. <tool_call>...</tool_call>) are left intact
for clean_response() to strip normally, preserving any text after them
- Switch from to_lowercase() to to_ascii_lowercase() to prevent byte
offset misalignment with non-ASCII characters whose lowercase form
has different byte length (e.g. Kelvin sign U+212A)
- Add closing_tag_for() helper to derive closing tags from open patterns
- Fix doc comment: "fenced markdown code blocks or inline code spans"
(not "indented", which find_code_regions() doesn't detect)
- Add regression tests: closed vs unclosed for each tag variant,
Unicode + case-insensitive offset safety, and mixed closed/unclosed
Co-Authored-By: Claude Opus 4.6 <[email protected]>
* fix: minor review items — consistent ascii_lowercase, closing_tag_for tests
- Switch has_native_thinking() from to_lowercase() to to_ascii_lowercase()
for consistency with truncate_at_tool_tags() approach
- Add unit tests for closing_tag_for(): standard tags, space-suffixed
patterns, pipe-delimited tags, and exhaustive coverage of all
TOOL_TAG_PATTERNS entries
- Add test for mixed closed+unclosed tags of different types
Co-Authored-By: Claude Opus 4.6 <[email protected]>
---------
Co-authored-by: Claude Opus 4.6 <[email protected]>
