Codex CLI 0.123.0: Bedrock Support, MCP Diagnostics, Realtime Fixes

TL;DR

• Amazon Bedrock model provider now built-in with AWS profile support
• New /mcp verbose command for full MCP server diagnostics
• Realtime handoff improvements so background agents receive transcript deltas
• Fixed /copy after rollback and Unicode input in VS Code WSL

New

• Amazon Bedrock provider — Built-in support for AWS Bedrock models with configurable AWS profile selection, no external setup needed.
• /mcp verbose diagnostics — Full MCP server diagnostics, resources, and templates while keeping plain /mcp fast for quick checks.
• Flexible plugin MCP config — .mcp.json now accepts both mcpServers and top-level server maps for cleaner configuration.
• Realtime handoff improvements — Background agents now receive transcript deltas and can explicitly stay silent when appropriate, fixing coordination issues.
• Remote sandbox config — Host-specific remote_sandbox_config requirements for remote execution environments.
• Updated model metadata — Bundled models refreshed including gpt-5.4 as the new default.

Fixed

• /copy after rollback — Now correctly copies the latest visible assistant response instead of pre-rollback state.
• Stuck Working states — Follow-up text submitted during manual shell commands is now queued properly.
• Unicode input in VS Code WSL — Fixed dead-key and Unicode input by disabling enhanced keyboard mode in WSL terminals.
• Stale proxy environment variables — Prevented restoration of outdated proxy settings from shell snapshots.
• codex exec flag inheritance — Root-level shared flags like sandbox and model options now properly inherited by subcommands.
• Leaked review prompts — Removed stale review prompts from TUI transcripts.

Update via: npm install -g @openai/codex-cli@0.123.0 or check the full release on GitHub.

Source: Codex