DeepSeek thinking-mode tool-call conversations may require the assistant
reasoning_content from previous turns to be sent back in later requests. Without
preserving it, those conversations can fail or lose reasoning context.
Changes:
- Preserve assistant reasoning_content when converting Chat Completions messages
to Responses input by wrapping it as a thinking block.
- Add regression coverage for non-streaming DeepSeek responses.
- Add regression coverage for streaming DeepSeek deltas.
- Add regression coverage that request-side messages[].reasoning_content is
passed through with tool calls.
Tests:
go test -tags=unit ./internal/pkg/apicompat ./internal/service -run
'TestChatCompletionsToResponses_AssistantReasoningContentPreserved|
TestChatCompletionsToResponses_AssistantThinkingTagPreserved|
TestForwardAsRawChatCompletions_PreservesDeepSeekReasoningContent|
TestForwardAsRawChatCompletions_ForcesStreamUsageUpstreamAndPassesUsageDownstream
Fix four issues flagged by copilot-pull-request-reviewer on PR #2143:
1. Probe URL missing /v1 prefix (openai_apikey_responses_probe.go)
Replaced bare TrimSuffix + "/responses" with buildOpenAIResponsesURL(),
which handles bare domain → /v1/responses correctly. Affected:
- ProbeOpenAIAPIKeyResponsesSupport (probe URL)
- TestAccount endpoint (apiURL for APIKey accounts)
2. Create endpoint not triggering probe (account_handler.go)
Capture created account from idempotent closure and call
scheduleOpenAIResponsesProbe after success, same pattern as
BatchCreate and Update.
3. Tests (openai_gateway_chat_completions_raw_test.go)
Added TestBuildOpenAIChatCompletionsURL (7 cases covering
bare domain, /v1 suffix, trailing slash, third-party domains,
whitespace) and TestBuildOpenAIResponsesURL_ProbeURL (6 cases
locking the probe URL construction for bare-domain inputs).
All unit tests pass; go build ./cmd/server/ clean.
