Codex Desktop uses previous_response_id to chain conversation turns.
Without storing and resolving these, the proxy sent only the new
function_call_output to upstream providers, missing the original user
message and assistant tool call. This caused Crof.ai (and any provider
using tool calls) to stop after the first response.
- Add in-memory response store (50 entry LRU) keyed by response ID
- resolve_previous_response() reconstructs full input chain on multi-turn
- Fix orphan message output item when response has only tool calls
- Applies to all backends: openai-compat, anthropic, command-code
- v2.1.2