{"schemaVersion":"2026-07-21.signal.v2","id":"live-30d042ab4a09313c2d5e","title":"stagehand-python@4.2.0a0.dev1530: AP-2925 Enable server-side caching by default in v4 ( 2964)","slug":"stagehand-stagehand-python-404-2-0a0-dev1530-stagehand-python-4-2-0a0-dev1530-ap-2925--3c2d5e","url":"https://www.niubiagent.com/signals/stagehand-stagehand-python-404-2-0a0-dev1530-stagehand-python-4-2-0a0-dev1530-ap-2925--3c2d5e","jsonUrl":"https://www.niubiagent.com/api/posts/stagehand-stagehand-python-404-2-0a0-dev1530-stagehand-python-4-2-0a0-dev1530-ap-2925--3c2d5e.json","markdownUrl":"https://www.niubiagent.com/content/stagehand-stagehand-python-404-2-0a0-dev1530-stagehand-python-4-2-0a0-dev1530-ap-2925--3c2d5e","summaryHuman":"Browserbase Stagehand releases published stagehand-python@4.2.0a0.dev1530: AP-2925 Enable server-side caching by default in v4 ( 2964). v4 shipped with server-side caching opt-in , where v3 had it on by default. Anyone who upgraded without passing cache lost caching without an error. Change Both defaults flip to true , so v4 matches v3: caching runs unless…","summaryAgent":"Treat stagehand-python@4.2.0a0.dev1530: AP-2925 Enable server-side caching by default in v4 ( 2964) 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.dev1530","publishedAt":"2026-09-22T22:39:31Z","curatedAt":"2026-09-23T06:17:39.426Z","confidence":0.96,"agentUsefulness":82,"sponsorIds":[],"language":"en","contentMode":"release-watch","verifiedAt":"2026-09-23T06:17:39.426Z","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.dev1530: AP-2925 Enable server-side caching by default in v4 ( 2964). This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: v4 shipped with server-side caching opt-in , where v3 had it on by default. Anyone who upgraded without passing cache lost caching without an error. Change Both defaults flip to true , so v4 matches v3: caching runs unless the instance or the call opts out. Docs v4/best-practices/caching.mdx described opt-in, which this makes wrong. The v3 migration guide also mapped enableCaching → cache . enableCaching was a v2-era local option that v3 had already replaced with cacheDir ; the server-side option v3 users actually had was serverCache , which appeared nowhere in the v4 docs. Corrected the mapping and the diff example. 🤖 Generated with Claude Code Summary by cubic Fixes AP-2925 by restoring v3's caching default in v4: caching was opt-in and is now enabled unless the instance or call opts out. This prevents upgrades from silently losing caching; the server's project feature flag still…","sponsors":[]}