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aubrey bd9149f79a fix(llm): detect mistral.ai provider and support reasoning_effort (#4698)
* fix(llm): detect mistral.ai provider and support reasoning_effort

Four coupled bugs broke Mistral thinking model support:

1. _detect_provider() had no mistral.ai host check, so all Mistral
   endpoints fell through to the generic 'openai' provider string.
   _provider_display_name() correctly identified them as 'Mistral',
   making any 'if provider == "Mistral"' check elsewhere dead code.

2. reasoning_effort parameter was never sent in the request payload,
   so Mistral never activated thinking mode even when the user
   configured a thinking-capable model (mistral-small-latest,
   mistral-medium-latest, magistral-*).

3. Mistral returns content as a typed array
   ([{"type":"thinking",...},{"type":"text",...}]) when
   reasoning is on, not as a plain string. Both the streaming and
   non-streaming parsers expected strings and silently dropped the
   thinking content.

4. _THINKING_MODEL_PATTERNS didn't include magistral or mistral-*
   model prefixes, so the frontend wouldn't tag reasoning output
   as thinking even after the above were fixed.

Fix:
- Add mistral.ai to _detect_provider() host checks
- Add a _normalize_mistral_content() helper that splits the typed
  array into (text, thinking) strings
- Inject payload["reasoning_effort"] = "high" when provider is
  Mistral and _supports_thinking(model) is true, in both stream_llm
  and llm_call_async payload construction
- Wire the normalizer into both response parsers
- Extend _THINKING_MODEL_PATTERNS to include magistral,
  mistral-small, mistral-medium, mistral-large

Tested on Docker install with mistral-small-latest +
reasoning_effort=high. Reasoning streams correctly into the
thinking panel after the fix.

Fixes #4678

* fix(llm): address review — lowercase provider id, configurable effort, tests

Addresses vdmkenny's review on PR #4698:

1. Removed duplicate 'if provider == "mistral"' block in stream_llm
   — two back-to-back copies, one was dead-redundant.

2. Dropped personal-context comment ('free-tier limits are generous
   for this user') and made reasoning_effort configurable via env var
   ODYSSEUS_MISTRAL_REASONING_EFFORT (high / medium / low / none).
   Default remains 'high' for backward compat with the tested behavior.

3. Recased provider id from 'Mistral' to 'mistral' to match the
   lowercase convention used by every other provider id in the file
   (openai, anthropic, ollama, copilot, ...). _provider_display_name()
   still returns the Title-Case 'Mistral' for UI labels — only the
   runtime id used in 'if provider == ...' checks was recased.

4. Added tests/test_llm_core_mistral_content.py with 13 tests pinning
   _normalize_mistral_content()'s contract: string passthrough, the
   Mistral array format (thinking + text blocks), and edge cases
   (empty, garbage, None, wrong types, missing fields, string-vs-array
   inner thinking field).

Also fixed a gap the review didn't catch: the non-streaming paths
(llm_call sync + llm_call_async) were missing the reasoning_effort
injection entirely. Added the same injection to both, so Deep Research
and agent tool calls also activate Mistral thinking.

All 13 new tests pass. Existing reasoning/streaming/ollama-thinking
tests still pass (38 tests, no regressions).

Fixes #4678
2026-06-23 10:28:17 +02:00