@velum-labs/routekit-provider-core

Internal provider module contracts, normalized source ports, HTTP backends, and provider protocol codecs.

Translated Codex subscription requests

The existing Chat-to-Codex Responses codec preserves ordered text and user image_url blocks (including image-only turns, URL/data-URL values, and image detail), function calls/results, structured output, and compatible reasoning metadata. Unsupported or malformed content blocks fail with a sanitized codex_responses_unmappable_chat_field error and a field path before provider transport. Images in assistant/instruction messages or string-valued tool results are rejected, not flattened to text.

This is translation, not native Codex relay equivalence. Subscription sources do not support native previous_response_id; callers must replay prior input. Subscription sampling controls (temperature, top_p) are rejected. max_tokens / max_completion_tokens (including translated max_output_tokens) remain advisory and unforwarded at the subscription boundary: they are not an enforced output or spending budget. The codec's non-subscription configuration still forwards an output cap.