Codex CLI 0.148.0-alpha.20

• [changed] Client message streaming now surfaces chunk-oriented message events instead of a single undifferentiated client-message result shape.
• [new] Collaboration turns emit a collab_waiting_end notification when a waiting phase finishes.
• [new] Web search activity can begin with a dedicated begin event for clearer progress signaling.
• [changed] Hook handler configuration distinguishes handler kinds more explicitly (agent, command, MCP tool, and prompt metadata) and adds MCP-oriented hook running support.
• [changed] Patch approval responses are modeled separately from broader exec-approval replies.
• [changed] MCP server value matching favors regex-style matchers over simple prefix matching.
• [changed] Login/account flows include cancel-login handling and tighten ChatGPT-oriented login parameters (including dropping the prior Amazon Bedrock login parameter path in this build).
• [changed] Conversation summary lookup accepts rollout-path / thread-id parameter shapes more consistently.
• [new] Additional response types land for thread usage queries, workspace messages, output diffs, curated plugin backup archives, npm package version info, and feedback requirements.

Under the hood

• New hooks engine MCP runner module; TUI turn-runtime code path removed in favor of the current chat turn handling layout.
• OpenTelemetry exporter wiring shifts toward OTLP gRPC rather than the prior OTLP HTTP path.
• Handshake rejection reasons include a no-compatible-version case.
• Environment surface adds workload-identity context (OPENAI_WORKLOAD_IDENTITY_CONTEXT / workload-related settings) and refreshes several sandbox/network and MCP protocol-related flags.
• Assorted serde/API payload churn (plan-type requests and related cleanup) with dependency lockfile updates for the alpha.20 tag.