Search intent: Antigravity 2.0 CLI after Google I/O 2026

If you searched for "Google Antigravity 2.0 CLI timeout", "Antigravity CLI Gemini API proxy", or "Gemini 3.5 Flash connection failed 2026", you likely installed the new stack right after Google I/O 2026 (May 19–20) unveiled Antigravity 2.0—a multi-agent desktop platform, refreshed Antigravity CLI, and SDK paths that Google positions as the successor lane for Gemini CLI power users. The demo looked smooth; your terminal shows hung spinners, Managed Agents stalling mid-task, or opaque "network unreachable" banners while Chromium-based Google dashboards still load.

This is not the same troubleshooting story as legacy Gemini CLI alone. Antigravity 2.0 orchestrates parallel agents, streams long-context calls through Gemini 3.5 Flash, and may spawn background workers your shell never inherited proxy settings from. You need observable Clash Verge Rev routing, deliberate HTTPS_PROXY placement for CLI invocations, and a plan for the desktop app that may ignore terminal exports entirely.

Antigravity 2.0 versus Gemini CLI: why proxy docs diverge

Google still ships Gemini CLI, but Antigravity 2.0 targets a broader agent surface:

  • Desktop multi-agent UI: several Managed Agents run concurrently, each opening HTTPS sessions independently of your shell.
  • Antigravity CLI: a dedicated terminal entry point with migration guidance from Gemini CLI—not a cosmetic rename.
  • SDK and automation hooks: CI scripts and custom runners may bypass both system proxy and shell exports.

Proxy fixes that satisfied Gemini CLI might leave half your Antigravity stack on DIRECT paths. Treat desktop GUI traffic, CLI subprocess trees, and SDK workers as three lanes requiring correlated evidence in Mihomo Logs—not one blanket VPN toggle.

Classify failures: routing starvation versus auth or quota

Before editing YAML, sort symptoms into buckets:

  • Watchdog timeouts after partial streaming often trace to inconsistent proxy adoption, saturated nodes, or Managed Agents spawning fetch loops outside your exported environment.
  • Immediate JSON errors citing invalid API keys or exhausted quotas are authentication or billing issues—routing changes will not help.
  • Symptoms disappearing when you flip Clash Verge Rev to Global mode strongly suggest GEOIP starvation or misordered DIRECT rules starving Google AI egress.
  • Desktop agents healthy while CLI alone fails usually means system proxy covers the GUI but HTTPS_PROXY never reached the terminal session launching Antigravity CLI.

Renewing credentials never fixes DIRECT misrouting; conversely, perfect prepend rules cannot resurrect depleted Gemini API allowances.

Google AI and Antigravity endpoint lens

Google reshuffles infrastructure frequently. Anchor rules on what your Connections tab shows during a failing Antigravity session—not forum paste from 2024:

  • generativelanguage.googleapis.com: primary REST façade for Gemini API calls, including Gemini 3.5 Flash completions Antigravity CLI invokes.
  • *.googleapis.com siblings when chunked uploads or regional routing bounce unexpectedly.
  • oauth2.googleapis.com and identity surfaces when token refresh fails separately from inference payloads.
  • aiplatform.googleapis.com or regional Vertex-style hosts when Managed Agents hit orchestration APIs beyond bare generative REST.
  • ai.google.dev and console-adjacent hosts when documentation or AI Studio sessions share cookies with agent runs.

Build a dated allowlist from Logs, then widen surgically. Compliance teams may reject blasting every googleapis descendant through overseas relays without audit trails.

Establish a reproducible Clash Verge Rev baseline

  1. Refresh your profile: stale nodes collapse under Antigravity's bursty parallel agent traffic more visibly than casual browsing.
  2. Document listener ports: note HTTP mixed port, SOCKS, and whether system proxy publishes the expected loopback address—wrong digits cause most "mysterious" CLI failures.
  3. Enable system proxy when appropriate: this covers the Antigravity 2.0 desktop app on macOS and Windows; CLI still needs explicit exports in many setups.
  4. Smoke domestic-sensitive flows: prepend rules must not break SSO or intranet tools your org audits.
  5. Archive Overrides with ISO dates: subscription refreshes should not silently strip Google AI prepend arcs.

Antigravity sessions differ from ping-only health checks: long-context Gemini 3.5 Flash runs multiplex large uploads and streaming token drains. Latency probes that look fine for web browsing may hide nodes that crumble under AI-shaped concurrency.

Tip: Keep a snippet named antigravity-google-ai-prepend-YYYYMMDD.yaml in team docs so incident bridges merge identical Mihomo prepend blocks instead of divergent Slack paste wars mid-outage.

Routing strategy: prepend rules, Global troubleshooting, TUN escalation

Developers balancing domestic CDN locality with overseas API access prefer surgical proxy routing over permanent Global mode:

  • Rules-first: prepend explicit selectors so Gemini API and Managed Agent hosts ride curated outbounds with traceable policy names.
  • Temporary Global: flip briefly to prove misclassification, capture screenshots, then revert—Global is a flashlight, not architecture.
  • TUN mode: escalate when Antigravity desktop spawns child processes that ignore both system proxy catalogs and shell exports.

Opaque consumer VPN apps rarely annotate which milliseconds of a Managed Agent stream traverse which relay—acceptable for video, brittle when finance tracks region-specific AI spend.

Illustrative prepend block for Antigravity 2.0

Replace PROXY with your profile's outbound group label (Select, auto groups, latency pools):

DOMAIN,generativelanguage.googleapis.com,PROXY
DOMAIN-SUFFIX,googleapis.com,PROXY
DOMAIN,aiplatform.googleapis.com,PROXY

The second line trades precision for coverage—validate side effects in Connections before committing. Narrow teams may prefer keyword rows discovered firsthand:

DOMAIN-SUFFIX,google.dev,PROXY
DOMAIN,ai.google.dev,PROXY

Avoid ludicrously broad DOMAIN-KEYWORD,google matches that hijack unrelated corporate SSO mirrors sharing substrings.

HTTPS_PROXY for Antigravity CLI launch paths

Antigravity CLI inherits the same messy environment trees as other terminal agents. Map your launch context:

  • Interactive shells: reconcile login versus non-login rc files; subshells stripping exports derail assumptions that zsh "just knows" your proxy.
  • IDE integrated terminals: some sanitize environments and drop HTTPS_PROXY unless configured in run/debug settings.
  • launchd / systemd user units: embed explicit environment dictionaries—Dock-spawned apps ignore dotfiles.
  • tmux, direnv, devcontainers: propagate proxies per repository when corporate Antigravity keys differ from personal Google Cloud orgs on the same laptop.
  • PowerShell: persist user-level variables; ephemeral $env: assignments mid-script vanish on window close.

Mirror uppercase and lowercase exporters—Node and Go runtimes pick inconsistently:

export https_proxy=http://127.0.0.1:7890/
export HTTPS_PROXY=http://127.0.0.1:7890/
export http_proxy=http://127.0.0.1:7890/
export HTTP_PROXY=http://127.0.0.1:7890/

Replace port 7890 with your Verge dashboard value each quarter—stale onboarding scripts rot silently. Carve NO_PROXY for captive portals, localhost, and private Git remotes.

Desktop Managed Agents: system proxy versus TUN

Antigravity 2.0's desktop app often respects OS-level proxy settings that Clash Verge Rev publishes when you enable system proxy. If Managed Agents still stall while Connections shows DIRECT rows for googleapis hosts, escalate methodically:

  1. Confirm system proxy toggle is on and matches your mixed listener port.
  2. Check whether the app spawns auxiliary processes (language servers, sandbox workers) that bypass the catalog.
  3. Enable TUN temporarily, reproduce the failure, capture adapter and policy snapshots.
  4. Revert TUN once prepend rules plus system proxy stabilize traffic—TUN adds complexity and occasional compatibility friction.

Running desktop agents and Antigravity CLI simultaneously doubles concurrent HTTPS load. Rotate nodes if one relay saturates under parallel Gemini 3.5 Flash streams.

Verification before reopening Antigravity marathons

  1. Timed curl through explicit proxy: curl -v --max-time 30 --proxy http://127.0.0.1:7890 https://generativelanguage.googleapis.com/$discovery/rest separates DNS jitter from stalled CONNECT handshakes; redact secrets from shared transcripts.
  2. Control without proxy: contrast behavior to isolate exporter omission versus routing-only mysteries.
  3. Bounded Global A/B: five-minute windows—not permanent posture changes.
  4. Logs correlation: match Antigravity CLI timestamps to Connections rows annotating policy names.
  5. Subscription URL sanity: ensure your profile refresh URL itself is not accidentally starved by the same DIRECT arc you are debugging.

Screenshot Connections rows beside failing CLI output when escalating—evidence beats adjectives.

DNS, fake-ip, and googleapis quirks

Synthetic address strategies speed browsing yet confuse resolvers juggling googleapis hierarchies:

  • Review fake-ip-filter exclusions when SaaS suffixes exhibit split-horizon surprises.
  • Consider nameserver-policy pinning for domains bouncing between encrypted DNS relays.
  • Brief resolver logging clarifies TTL divergence—disable flood mode afterward.

Cross-check DNS tweaks with Connections—you want resolution and policy fingerprints together, not single-dimension guessing.

Failure signal matrix for quick scanning

Observation Likely root Next move
Global relieves stalls instantly GEOIP starvation or misordered DIRECT Reorder prepend anchors; screenshot offending rules
Desktop OK, CLI hangs System proxy covers GUI, not shell Export HTTPS_PROXY in CLI launch path
curl --proxy OK, Antigravity CLI hangs Child process ignoring env Trace PID tree; try TUN briefly
TLS unknown_ca alerts Corporate MITM trust mismatch Align institutional roots with Go/Node trust stores
Instant auth JSON errors Key rotation or quota Fix credentials first
Failures after Wi-Fi roam only Captive portal residue Flush routes; tether clean baseline

Frequently asked questions

Should I migrate from Gemini CLI to Antigravity CLI for proxy config?

Migration changes entry points and may add Managed Agent orchestration hosts, but core Gemini API domains largely overlap. Re-validate Logs after switching—do not assume Gemini CLI Overrides copy verbatim forever.

Does Gemini 3.5 Flash need different rules?

Model tier updates rarely change primary googleapis hostnames. Focus on observational evidence during Antigravity runs rather than model-name-specific rule folklore.

Why do parallel Managed Agents fail together?

Burst concurrency exposes weak nodes and DIRECT misroutes simultaneously. Stagger agent launches during diagnosis; rotate outbounds if one relay saturates TCP windows under multi-stream load.

Team hygiene for Antigravity rollouts

  • Version-control Overrides fragments tagged antigravity-google-ai with quarterly review dates.
  • Document mandated launch contexts in onboarding READMEs (direnv allow, IDE terminal settings).
  • Automate sanitized smoke curls in bootstrap scripts without leaking API keys.
  • Audit nodes under speculative AI parallelism—not sleepy browsing pings alone.
  • Reconcile egress policies with InfoSec before production Antigravity deployments.

Why opaque VPN toggles frustrate Antigravity engineers

Mass-market tunnel apps optimize cheerful connect buttons—not traceable adjudication of which microseconds of a Managed Agent stream ride which relay under Gemini 3.5 Flash concurrency bursts. Lightweight SOCKS injectors without expressive grammar crumble when Antigravity spawns unpredictable auxiliary ports during agent refactoring loops.

Consolidating on Mihomo transparency plus Clash Verge Rev ergonomics turns Antigravity networking into annotated evidence: you prepend rules for googleapis egress, export HTTPS_PROXY where CLI needs it, align system proxy or TUN for the desktop app, and hand teammates reproducible YAML instead of restart incantations.

If Antigravity 2.0 convinced you Google APIs were "unstable" while browser demos stayed flawless, disciplined split routing—not mythical model favoritism—usually explains the gap. Compared with one-size consumer VPN overlays, expressive Clash-family routing keeps domestic CDN paths intact while selectively elevating Antigravity and Gemini API traffic through nodes your compliance team approved—balancing latency budgets without surrendering the nuanced tunnels modern agent developers still demand in 2026.

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