How to fix Agent execution terminated due to error in Antigravity?

You try to run Antigravity on macOS and the run ends with the message Agent execution terminated due to error immediately. It happens across all models and persists after basic resets and re authentication.

Antigravity on macOS shows Agent execution terminated due to error

Users report that Antigravity accepts a prompt but fails instantly during generation or hangs indefinitely with the message: Agent execution terminated due to error. This occurs even with a valid Ultra subscription, stable internet, no MCP servers enabled, and after restarts and cache resets. If you recently hit usage ceilings or billing issues you can also review common quota related failures here: quota errors in Antigravity.

Solution Overview

Aspect	Detail
Root Cause	Corrupted local profile or cached session token, combined with a recent app backend update, can cause the agent to abort immediately. Service side incidents and quota enforcement can present the same symptom.
Primary Fix	Fully quit Antigravity, remove the local profile cache and logs safely, relaunch, re sign in, then test a trivial prompt in a fresh workspace.
Complexity	Easy
Estimated Time	10 to 20 minutes

Fix Antigravity agent termination on mac

Step-by-Step Solution

Step 1. Fully quit the app and background processes

• Quit Antigravity from the menu, then ensure no helper remains.
• Run these commands in Terminal:

osascript -e 'tell application "Antigravity" to quit' || true
pkill -f "^Antigravity$" 2>/dev/null || true
pkill -f "Antigravity Helper" 2>/dev/null || true

Step 2. Back up and remove the local Antigravity profile cache

• The goal is to force a clean profile without losing a copy of current data.
• Run the following. It safely backs up any found folders before removing them.

stamp=$(date +%Y%m%d-%H%M%S)
backup="$HOME/Desktop/Antigravity-backup-$stamp"
mkdir -p "$backup"

for d in \
 "$HOME/Library/Application Support/Antigravity" \
 "$HOME/Library/Caches/Antigravity" \
 "$HOME/Library/Logs/Antigravity"
do
 if [ -d "$d" ]; then
 echo "Backing up $d to $backup/$(basename "$d")"
 ditto -V "$d" "$backup/$(basename "$d")"
 echo "Removing $d"
 rm -rf "$d"
 fi
done

echo "Backup completed at: $backup"

If none of these folders exist, nothing is deleted and you can proceed. Step 3. Relaunch Antigravity and sign in again

• Open Antigravity, perform a fresh sign in, and confirm the Ultra plan is detected on the account page.
• Create a new empty project or workspace to isolate issues from previous state.

Step 4. Test with a trivial prompt

• In the new workspace, ask a minimal question such as: “Return the string hello from Python”.
• If code generation works now, your previous session profile was corrupted.

If you suspect your build is out of date or mismatched with the service, review version guidance here: version related fixes for Antigravity. Step 5. Verify network and TLS from macOS

• Check basic connectivity and HTTP capability.

networkQuality
curl -I --http2 https://ai.google.dev
openssl s_client -connect ai.google.dev:443 -brief </dev/null

You should see successful HTTP response headers and a TLS handshake summary without errors. Step 6. Confirm proxies and VPN are not intercepting

• On Wi Fi:

networksetup -getwebproxy "Wi-Fi"
networksetup -getsecurewebproxy "Wi-Fi"

If either shows Enabled: Yes then temporarily disable in System Settings or remove the proxy and retry. Step 7. Inspect recent app logs for immediate failures

• Use macOS unified logging to spot crash or auth errors:

log show --style compact --predicate 'process == "Antigravity"' --last 30m

Open Antigravity and reproduce once while watching the log. Step 8. Check service health and quota

• If the clean profile still fails immediately, check for any regional or service incidents on the vendor status pages and verify your usage quota and billing status.
• If you are seeing rate or credit enforcement symptoms, this guide helps confirm and fix them: resolving Antigravity quota issues.

Alternative Fixes & Workarounds

Reinstall the application cleanly

• Move the app to Trash, empty Trash, then reinstall the latest release from the official download page.
• After reinstall, repeat the clean profile steps above.

Reset authentication artifacts from Keychain

• Open Keychain Access, search for entries related to Antigravity or Google sign in for the app, delete only those app specific items, then sign in again.
• Re test a trivial prompt.

Switch macOS user profile

• Create a new macOS user, install Antigravity there, sign in, and test a simple prompt. If it works, the issue is profile scoped to your original user.

Turn off security software and VPN temporarily

• Some security agents or VPNs intercept TLS. Disable them temporarily and retry.

If you suspect initial account configuration or model availability is the blocker, see this checklist: account setup and model visibility issues.

Troubleshooting Tips

• Try a different network such as a mobile hotspot to rule out office firewall policy.
• Keep MCP servers disabled while testing to ensure a pure baseline.
• If the error appears only for a specific project, export work, then create a new workspace and re test.
• Watch the in app developer console if available under the Help or View menu, and capture any red stack traces to include with support tickets.
• Collect a sysdiagnose when the failure occurs for deeper analysis if requested by support:

sudo sysdiagnose -f "$HOME/Desktop" -A

Best Practices

• Keep Antigravity updated and avoid stale app versions after backend rollouts.
• Maintain a periodic backup of the app profile so you can reset safely when corruption occurs.
• Avoid system wide proxies and TLS interception for development machines when using AI tools.
• Monitor usage and billing so quota enforcement does not surprise you during active sessions.

Final Thought

In most cases this error is caused by a corrupted local session or a transient service condition. A clean profile plus a quick network and quota check resolves the blocker fast, and the links included here help you verify version and account health end to end.