Vercel Labs Release Notes

New Features

• Turbo JSONC workspaces: Workspaces that only have turbo.jsonc now use Turbo orchestration, the same as turbo.json. (#422)
• Unresolved hostname warning: After registering a route, portless asks the proxy to sync the hosts file and warns when the hostname still does not resolve. (#374)
• WebMCP documentation site: The docs moved to Geistdocs and expose their pages to agents through WebMCP. (#427)

Bug Fixes

• Hosts sync data loss: Manual hosts sync refuses to write when the hosts file cannot be read, verifies what it wrote, and removes stale managed entries when no routes remain. (#424)
• Local CA certificate: The generated CA no longer carries a duplicate Basic Constraints extension on OpenSSL 1.1.1 and LibreSSL, which macOS and OpenSSL 3 rejected and left *.localhost untrusted. (#443)
• Proxy crash on backend restart: The proxy no longer forwards client hop-by-hop headers, which left backend sockets open and crashed the proxy with ECONNRESET when a backend restarted. (#445)
• Wildcard fallback order: With --wildcard, an unregistered subdomain now routes to the most specific registered parent instead of the first one stored. (#446)
• Occupied app ports: Free app ports are checked on 127.0.0.1, ::1, 0.0.0.0 and ::, so portless no longer assigns a port another server already holds. (#447)
• Version manager node: Child commands now use the node a version manager put first on PATH; portless's own node directory is only a fallback. (#448)

Contributors

• @Railly
• @ctate
• @Knat-Dev
• @EfeDurmaz16
• @octo-patch
• @bilinkis
• @luizfm
• @Geektrovert
• @thazhemadam
• @begininvoke

Bug Fixes

Fixed auth vault login to pick usable controls when hidden duplicates exist, and to bind credential entry to the selected field so replaced fields or redirected focus are rejected before submitting (#2014)

Fixed chat mode to allow webmcp, skills, and other top-level browser commands, so the model uses page WebMCP tools instead of falling back to eval (#2015)

Fixed Kernel profiles so KERNEL_PROFILE_NAME sessions send the profile as an object instead of failing with a 400, and added KERNEL_PROFILE_SAVE_CHANGES to opt into saving changes back (#2004)

Fixed Chrome freezing after launch by draining its stderr for the browser's lifetime, so a full log pipe no longer blocks the browser (#2003)

Fixed Browser Use by switching to Cloud V4, which creates, attaches to, and stops the same browser with bounded timeouts (#1879)

Fixed Vercel Sandbox shared memory detection by measuring /dev/shm capacity and adding --disable-dev-shm-usage below 256 MiB, so Chrome no longer terminates renderers on the undersized mount (#1890)

Improvements

Upgraded the eve integration from eve 0.47.3 to 0.57.0, so apps on eve 0.50 and later build again (#1945)

Documentation

Updated the contact sheet example with the loading-flash demo output (#1871)

Contributors

@Railly

@benjamincanac

@boatri

@luxleader

@petehunt

@robertjamesprior

@simonellefsen

@zyz619963502zyz

New Features

TanStack Start renderer: Added @json-render/tanstack-start for JSON-defined applications with file-based routes, reusable layouts, SSR loaders, head metadata, prerender paths, client navigation, and route fallbacks (#334)

Experimental Jev composition: Added experimental_composeSpec and experimental_createEvaluator to compose validated specs from app-owned candidates, plus a Jev model option and iterative composition editing in the playground

Improvements

Vue named slots: Vue registries now support catalog-declared named slots alongside the default children slot (#323)

React streaming stability: Stabilized streamed React renders and added coverage for incomplete streamed props and nested prop identities (#325)

Documentation and project status: Expanded renderer, Jev, and package documentation and added Labs status badges to the project README

Contributors

@ctate

@Railly

New Features

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)

Improvements

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

Bug Fixes

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)

Documentation

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)

Contributors

@ctate

@Railly

@MauricioAntolin

@mecampbellsoup

@evrenverse

@judegao

@petehunt

New Features

Added higher-quality video recording: record start and record restart now capture the current active page at 30 fps by default, support --fps 1-60, use Page.startScreencast for smoother motion, and preserve wall-clock timing. WebM and MP4 output are documented, and doctor reports the ffmpeg recording dependencies (#1763, #1776, #1778)

Added WebMCP availability output so navigation responses advertise when a page exposes allowed WebMCP tools, including availability metadata for CLI, JSON, and MCP clients (#1760)

Added session setup inheritance for new tabs. Tabs opened with tab new or through page clicks now inherit the active session's headers, credentials, user agent, locale, timezone, geolocation, offline mode, routes, color scheme, and init scripts before their first navigation (#1777)

Bug Fixes

Fixed recording startup validation so missing ffmpeg, extensionless output paths, and invalid recording options fail before browser or recording state changes. Failed replacements preserve the active take, and ffmpeg errors now include useful diagnostics (#1778)

Fixed recording navigation state so URL navigation during recording clears stale element refs, frame scope, and page WebMCP state like normal navigation (#1776)

Contributors

@jamesvclements

@ctate

@Railly

Changelog

• fix: fall back when skill snapshots omit files (#2069)
• AGENTS.md: outdated source files listed (#2063)
• fix(remove): only offer directories that hold a SKILL.md (#2055)
• fix: treat Droid as a universal agent to stop duplicate skill definitions (#2012)
• fix: point Kilo Code at .agents/skills and ~/.kilo/skills (#2011)
• feat: add fx agent support (#2006)
• feat: add Sarvam Code agent support (#2004)
• fix(add): exit non-zero when install prompts cannot run without a TTY (#1991)

Contributors

@0thernet,@doanbactam @dylanpulver,@ecki @pproenca,@pushkar-sarvam

New Features

Added experimental WebMCP support for discovering and invoking tools provided by the current page, including frame-aware tool selection, detached results, cancellation, bounded metadata and output handling, and an opt-in MCP tool profile. WebMCP is enabled by default for locally managed Chrome and can be disabled with --no-webmcp or AGENT_BROWSER_NO_WEBMCP.

Added a WebMCP generation skill that helps agents expose existing page workflows as validated page tools while recording safety constraints, deterministic checks, and fallback behavior.

Improvements

Updated the eve integration to 0.47.3 and raised its compatibility floor to 0.39.1.

Updated brace-expansion dependency resolutions across the project lockfiles.

Bug Fixes

Removed the obsolete Lightpanda session timeout argument so launches use the current supported server options.

Contributors

@ctate

@Railly

@anupamme

@arrufat

Security

Hardened dashboard origin validation and reverse-proxy access with same-origin provenance enforcement that defends against DNS rebinding, form/header smuggling, and cross-origin requests. Reverse-proxied origins now require exact HTTPS allowlisting and generated token authentication, while tokenless IPv4 and IPv6 loopback access remains supported. Dashboard options are validated strictly, and CLI and MCP lifecycle behavior is aligned (#1738)

Bug Fixes

Fixed root remote CDP WebSocket URLs with query strings to insert the required slash before the query while preserving the encoded query (#1735)

Contributors

@ctate

@Railly

Bug Fixes

Fixed Windows ARM64 launcher selection to prefer a native ARM64 executable when present and fall back to the published x64 executable through Windows emulation when it is not (#1725)

Fixed stream URL tracking to emit active main-frame URL updates for full-document, History API, and fragment navigation, while rebinding correctly after active-tab changes and ignoring child-frame or background-tab navigation (#1682)

Fixed snapshot diff element references by resetting ref numbering for each diff, invalidating refs across URL navigations, and preserving the previous refs when a diff fails (#1719)

Improvements

Updated Rust dependencies to rustls-webpki 0.103.13 and quinn-proto 0.11.17 (#1723, #1720)

Contributors

@ctate

@Railly

@Angelmmiguel

@anupamme

@nexxusbruno-ship-it

New Features

Added private proxy CA trust for locally launched Chromium on Linux. Use --ca-cert <path>, AGENT_BROWSER_CA_CERT, or caCert in config and MCP to import a PEM bundle or DER certificate into an isolated NSS trust store without disabling hostname, validity, or unrelated-authority verification. The effective CA persists across commands in a running session, equivalent certificate content reuses Chromium, and --no-ca-cert explicitly clears retained trust. Unsupported launch modes and conflicting CA options return actionable errors (#1669)

Improvements

Added a bundled protected Vercel deployments skill that guides agents through short-lived Trusted Sources OIDC authentication, authorized automation bypasses, and explicit human handoffs for dashboard-only configuration (#1705)

Contributors

@Railly

@ctate

@bilby91