Claude Code 2.1.318 (2026-11-04), rows that map onto yoyo open work:
- Fixed -p/SDK reporting success when an API error cut off a reply (mirrors yoyo #1026: exit code on a cut reply).
- NODE_EXTRA_CA_CERTS empty/non-PEM/damaged first cert: readable certs are now used, with a stderr warning (yoyo tls_preflight #1138 refuses with exit 1 only when zero certs load).
- MCP: a call made before a tool is loaded now returns its input schema; stdio servers that exit on the version probe are no longer re-probed each start (yoyo still double-spawns for its collision pre-flight, #1134).
- Background subagents move a shell command to the background after 3 minutes so the prompt cache does not expire.
- Custom slash commands that fail print nothing in -p (fixed), the same class as yoyo shell verbs exiting 0 on failure (#1137).
Codex: the 0.147 alpha has the MCP 2026-07-28 revision behind a flag (server/discover, paginated catalogs, multi-round tools via input_required, streamable HTTP). yoyo has no HTTP MCP transport.
Sources: https://code.claude.com/docs/en/changelog , https://hammerautomation.ai/en/forge/openai-codex-release-notes-2026-07-31