{"schemaVersion":"2026-07-21.signal.v2","id":"live-a11f9817e7b6ac20faa6","title":"stagehand-python@4.2.0a0.dev1574: Harden Codex CUA facade isolation, evidence, and tool logging ( 2907)","slug":"stagehand-stagehand-python-404-2-0a0-dev1574-stagehand-python-4-2-0a0-dev1574-harden-c-20faa6","url":"https://www.niubiagent.com/signals/stagehand-stagehand-python-404-2-0a0-dev1574-stagehand-python-4-2-0a0-dev1574-harden-c-20faa6","jsonUrl":"https://www.niubiagent.com/api/posts/stagehand-stagehand-python-404-2-0a0-dev1574-stagehand-python-4-2-0a0-dev1574-harden-c-20faa6.json","markdownUrl":"https://www.niubiagent.com/content/stagehand-stagehand-python-404-2-0a0-dev1574-stagehand-python-4-2-0a0-dev1574-harden-c-20faa6","summaryHuman":"Browserbase Stagehand releases published stagehand-python@4.2.0a0.dev1574: Harden Codex CUA facade isolation, evidence, and tool logging ( 2907). Stack Top-of-stack child of 2906 ( evals/consolidation-17-gemini-cua ). Review against that immediate parent, not main . Summary Port the remaining focused Codex/Stagehand facade hardening from the experimental…","summaryAgent":"Treat stagehand-python@4.2.0a0.dev1574: Harden Codex CUA facade isolation, evidence, and tool logging ( 2907) as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.","category":"open-source","tags":["browserbase","browser-agent","automation"],"sourceName":"Browserbase Stagehand releases","sourceUrl":"https://github.com/browserbase/stagehand/releases/tag/stagehand-python%404.2.0a0.dev1574","publishedAt":"2026-10-04T07:44:18Z","curatedAt":"2026-10-04T12:17:51.730Z","confidence":0.96,"agentUsefulness":77,"sponsorIds":[],"language":"en","contentMode":"release-watch","verifiedAt":"2026-10-04T12:17:51.730Z","changeType":"release","actionItems":["Review the official Browserbase Stagehand releases release notes before upgrading.","Check compatibility, migration, and security notes against your current agent stack.","Run focused regression tests before production rollout."],"body":"Browserbase Stagehand releases published stagehand-python@4.2.0a0.dev1574: Harden Codex CUA facade isolation, evidence, and tool logging ( 2907). This automated release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Stack Top-of-stack child of 2906 ( evals/consolidation-17-gemini-cua ). Review against that immediate parent, not main . Summary Port the remaining focused Codex/Stagehand facade hardening from the experimental Codex worktree without replacing the consolidation stack's newer shared runtime. Add opt-in facade JSONL tool logging: request/session IDs, actual arguments/code, paired starts/ends, timing, errors, bounded result previews and browser readiness. Never write logs to MCP stdout; redact known credentials and omit image payloads. Escape Unicode line separators in text tool results, addressing the stream parsing failure observed in the Hostelworld benchmark traces. Share isolated HOME/CODEX HOME creation between the SDK example and evals; do not inherit operator plugins/config/thread context. Preserve file-based auth. Abort unexpected MCP servers, await observation capture, and match…","sponsors":[]}