feat(xai): expose explicit Responses API routing via xai_api provider option#699
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… option `use_responses_api?/1` only flipped to `/responses` as a side effect of including xAI's built-in tools (web_search/x_search). Multi-turn reasoning loops with custom function tools benefit from the stateful Responses endpoint too — `previous_response_id` threads reasoning across turns so Grok-4 family models keep "thinking" through a tool round-trip rather than restarting fresh in each Chat Completions call. Add `xai_api: :auto | :chat | :responses` (default `:auto` preserves the existing built-in-tool behavior). `:responses` forces the Responses endpoint regardless of which tools are present; `:chat` is the explicit override the other direction. Verified end-to-end with a probe: Grok 4.3 + reasoning_effort: medium + tool_choice: required completes a two-turn fetch_changed_files → post_review loop natively on /responses but stalls after the first tool call on /chat/completions. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
mikehostetler
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Description
Add
xai_api: :auto | :chat | :responsesprovider option so callers can force xAI's/responsesendpoint without enabling a built-inweb_search/x_searchtool. Default:autopreserves the existing behavior.use_responses_api?/1now readsxai_apiandxai_toolsfrom both the top level and:provider_options, so the toggle works on the streaming path too (Options.process!/4re-nests provider-schema keys before they reachattach_stream).Adds a
guides/xai.mdentry under Provider Options and 4 tests for the routing-override matrix.Type of Change
Breaking Changes
Testing
mix test)mix quality)Checklist
CHANGELOG.md(it is auto-generated by git_ops)Related Issues
Closes #