vercel-labs/agent-browser v0.38.0 on GitHub

Added conditional screenshots with screenshot --if-changed to skip unchanged captures and --threshold <0-1> to tolerate small pixel differences. Screenshot history is scoped to each tab and capture mode, and unchanged captures omit the image path to save tokens (#1813)
Added automatic snapshot deltas with snapshot --delta, which returns a full baseline followed by an unchanged revision or compact structural changes. Use --full to refresh the baseline (#1811)
Added persistent snapshot refs for surviving DOM elements across same-document changes. Replaced elements and navigated pages or iframes invalidate their refs without recycling identifiers (#1812)
Added human-like pointer movement with session --input-mode, per-action --human for clicks and drags, and reproducible curved mouse move paths (#1810)
Added recording presentation tools: --cursor renders an animated pointer and click ripple, while --contact-sheet saves a timestamped PNG summary of visual changes (#1807, #1808)
Added stateful auth vault login with auth login --no-navigate, which fills an already prepared login page after verifying its origin against the credential URL (#1771)
Added WebMCP catalog updates to normal browser responses. Concise, content-bounded summaries appear on initial discovery and catalog changes, while full schemas remain opt-in (#1842)

Improved recording frame timing by holding the latest Chrome frame between repaints so the output duration follows the requested frame rate (#1806)

Fixed CDP transport recovery and shutdown so malformed transport messages do not strand unrelated commands and failed initialization disconnects cleanly (#1739)
Fixed dropdown label matching to normalize whitespace, including non-breaking spaces, when selecting options by visible label (#1736)

Clarified reliable browser wait strategies by recommending page-specific selectors, text, URLs, or JavaScript conditions and reserving networkidle for pages known to become quiet (#1834)