Codex CLI 0.120.0: Realtime V2 Streaming, Hook UI Polish

TL;DR

• Realtime V2 now streams background agent progress while queuing follow-up responses
• Hook activity rendering overhauled for better scannability in the TUI
• Windows sandbox fixes for split filesystem policies and symlinked writable roots

New

• Realtime V2 background agent streaming — Stream progress updates while work runs and queue follow-up responses until the active response completes, reducing perceived latency.
• Improved hook activity rendering — Live running hooks now display separately from completed output, keeping only useful results for cleaner TUI scanning.
• Thread title in custom TUI status — Custom status lines can now include the renamed thread title for better context.
• MCP outputSchema for code-mode tools — Tool declarations now include structured output schema details for more precise type handling.
• SessionStart hook source distinction — Hooks can now differentiate between sessions created by /clear, fresh startup, or resume.

Fixed

• Windows elevated sandbox handling for split filesystem policies with read-only carveouts under writable roots.
• Sandbox permission handling for symlinked writable roots and carveouts, preventing failures in shell and apply_patch workflows.
• codex --remote wss://... panics by installing the Rustls crypto provider before TLS websocket connections.
• Tool search result ordering now preserved instead of alphabetically reordered.
• Live Stop-hook prompts now appear immediately instead of waiting for thread history reloads.
• App-server MCP cleanup on disconnect to properly tear down unsubscribed threads and resources.

Update: npm install -g @openai/codex-cli@0.120.0 or check the full release on GitHub.

Source: Codex