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Antigravity "Agent Execution Terminated Due to Error": What It Means and Fixes

Q: How do I see the real error behind `Agent execution terminated due to error`?

Update with `agy upgrade` and check ~/.gemini/antigravity-cli/cli.log, per the maintainer on issue #44.

Q: Does logging out fix it?

Several users on issue #44 said `/logout` and signing back in worked, but the original reporter said it didn't help them.

Antigravity says 'Agent execution terminated due to error'? What it means, how to tell quota from server errors, and the fixes users report, with sources.

By Engineer Foodie Desk Nov 2, 2026 ✓ Sources checked Nov 2, 2026

8 min read

Error text, the maintainer’s explanation and user reports checked Nov 2, 2026 on the official antigravity-cli GitHub issue #44. Commands checked Nov 2, 2026 on Google’s Antigravity CLI reference and CLI troubleshooting page. Other dates under Sources. No affiliate links on this page (how we work).

Short version: this error tells you nothing because it was built to tell you nothing. A maintainer on Google’s own repo says older Antigravity CLI builds hid network, sign-in and quota failures behind this one message. So step one is updating the CLI so it shows you the real error. Step two is working out which of those three you’ve actually got.

The exact error: `Agent execution terminated due to error`

This is the text from the official antigravity-cli repo, issue #44 (verified Nov 2, 2026):

Agent execution terminated due to error

The person who opened the issue on May 20, 2026 wrote: “The ‘Agent execution terminated due to error’ error always occurs. Logging back into the account doesn’t help.” As of Nov 2, 2026 the issue is still open, labeled bug and stat:awaiting response, with 41 comments. The latest one is from Sep 19, 2026.

One-line answer: the agent’s request failed and the CLI didn’t say why. Per the maintainer, the hidden cause is usually network, sign-in or quota, and newer CLI builds print the actual reason.

That answer comes from the only reply on the thread by a repo collaborator (Aug 25, 2026): “In older CLI versions, any underlying network or authentication failure was masked behind the generic Agent execution terminated due to error. message without showing the actual cause. Recent versions now surface explicit on-screen diagnostics (such as exact proxy connection refusals, token expiries, or quota limits).”

It’s the Twin Peaks of error messages: the owls are not what they seem, and the error isn’t the actual error. A user on the thread (Jul 9, 2026) had the same complaint: “there can be many reasons for that error - so the main annoyance is that it does not tell you why - so you can only guess.” Honestly, that’s the worst part. Shipping a catch-all message is a choice, and it turned one bug report into 41 comments of people guessing.

Google’s CLI troubleshooting page has no entry for this error as of Nov 2, 2026. It covers PATH problems, a locked keyring, SSH clipboard and the self-updater lock. GitHub’s issue search found 187 issues containing the string across repos (checked Nov 1, 2026), including third-party ones, so you’re not alone.

Quota, server or your machine: how to tell

Since the message is generic, look at what’s around it. Here’s how the three likely causes from the maintainer’s comment show up:

Clue	Likely cause	Check
Quota text shown	Plan quota	`/usage`
Fails on all models	Sign-in/network	`/logout`
Fails on one model	Model side	`/model`
Works on retry	Temporary	Wait

Quota. If you’ve run out, Antigravity normally says so in plain words: Individual quota reached. Please upgrade your subscription to increase your limits. Resets in … (from the official repo, verified Oct 31, 2026). Our Antigravity individual quota reached post covers that one. The CLI reference lists /usage (alias /quota) to “Display model quota usage” (verified Nov 2, 2026). If /usage shows quota left and you still get the generic error, quota probably isn’t your problem. For how the quota buckets work, see Antigravity usage limits.

Sign-in or network. The maintainer names “proxy connection refusals” and “token expiries”. On the thread, one user’s first suggestion was “try check your network proxy”, and another wrote on Jun 16, 2026: “Looks proxy problem solved @1.08.” A different user on Apple Silicon macOS said they’d ruled out proxy, Wi-Fi and token issues and the error still happened on every model (Jun 20, 2026). So proxy is a real cause for some people but not all of them.

Model side. Several users on #44 said only Google’s models failed. “It works if you use a model other than Gemini” (Jul 19, 2026). On Sep 6, 2026 another wrote that “anthropic (sonnet 4.6 and opus as well as OSS 120B) work just finde, only the google models are off”, and others agreed. Google hasn’t confirmed this pattern. There’s also a timing catch: Antigravity’s models page lists Claude Sonnet 4.6, Claude Opus 4.6 and GPT-OSS-120b for removal on Nov 2, 2026 (verified Oct 26, 2026). So as of Nov 2, 2026, that particular escape route is closing.

Google doesn’t publish an official status page for Antigravity. Nothing turned up in the docs index (checked Nov 2, 2026). So “is it down?” has no official answer.

Fixes, in the order I’d try them

These come from the maintainer’s reply, Google’s docs and what users on issue #44 reported. User reports are labeled as such. Google hasn’t confirmed them.

Update the CLI first. The maintainer’s fix: run agy upgrade. Newer builds replace the generic message with the real cause. Note that agy upgrade comes from that GitHub reply. It isn’t in the CLI reference page we checked. If the updater complains about another background updater (update.lock), Google’s troubleshooting page says to run rm -f ~/.gemini/antigravity-cli/updater/update.lock (verified Nov 2, 2026).
Read the real error. If it still fails, the maintainer asked for “the latest error message on your screen or from ~/.gemini/antigravity-cli/cli.log”. The CLI also has a --log-file flag to change the log path (CLI reference, verified Nov 2, 2026). If the log says quota, token or proxy, fix that thing directly.
Sign out and back in. /logout will “Disconnect your profile and purge authentication tokens from the secure keyring” (CLI reference). On #44, “try log out ( using /logout ) and re log in, it worked for me” (Jul 29, 2026) was followed by several “worked for me too” replies (Aug 4–11). The original reporter said re-login didn’t help them, so it’s not a sure thing.
Check your proxy/network. This one is from user reports plus the maintainer’s mention of proxy refusals. If you’re behind a corporate proxy or VPN, test without it, where your company’s rules allow that.
Try another model. /model picks your default, and /model <model> <prompt> runs one prompt on a different model without changing it (CLI reference). Some users got through by switching models, while others said “I have tried all models and I still get this error” (May 29, 2026).
Start a fresh conversation. /clear (alias /new) will “reset active conversation contexts” (CLI reference). This is a cheap test. No source says it fixes this error.
Retry, a few times, then stop. “I just keep repeating the same prompt a few times and eventually it works again” (Jul 9, 2026); “retry 10 times work for me” (Aug 11, 2026). Past a few tries, it starts to look like Basil Fawlty thrashing his broken-down car with a branch. Satisfying, sure, but the car isn’t listening.
Reinstall clean, as a last resort. One user wrote “logout + uninstall + delete all files worked” (Aug 8, 2026). Sign out first so you don’t lose anything you care about.
Get help. Google’s FAQ points support questions to its communities page (verified Nov 2, 2026). Or add your cli.log error to issue #44, since that’s what the maintainer asked for.

What not to do: don’t run third-party “manager” tools or account-rotation scripts to dodge limits. Google’s FAQ says third-party software that uses an Antigravity login violates its Terms of Service and can get you suspended (verified Nov 2, 2026). Trading a generic error for a banned account is not an upgrade.

Error	Meaning	Page
Individual quota reached	Plan quota used up	Quota post
Agent execution terminated	Hidden failure	This page
Keyring is locked	OS keyring locked	CLI troubleshooting
Age unverified	Under-18 block	Antigravity FAQ

The keyring error reads Error: failed to retrieve token: secret keyring is locked, and Google’s fix is to unlock your OS keyring (troubleshooting page, verified Nov 2, 2026). The FAQ says Antigravity is unavailable to users under 18 and links to Google’s age verification (verified Nov 2, 2026).

Does paying make it go away?

Not that anyone has published. Google’s docs don’t link this error to plan level. Nobody on #44 says upgrading fixed it, and the maintainer’s causes (network, tokens, quota) aren’t things a plan upgrade obviously touches, except quota. If the real error turns out to be quota, a bigger plan does raise limits. Google’s plan page lists Antigravity agent requests as Limited on Plus, Expanded on Pro and higher on Ultra (one.google.com, verified Oct 29, 2026), with no numbers published. See is Antigravity free? and Antigravity Plus vs Pro before you pay for a fix to the wrong problem.

There’s also a CLI setting, useG1Credits, that “Uses your AI credits for model requests after your plan’s quota runs out. Not available for business accounts” (CLI reference, verified Nov 2, 2026). It only matters if the real cause is quota.

Here’s what I’d do

Run agy upgrade, send one prompt, and read what the newer build actually says. If it names a cause, fix that cause. If it’s still the generic line, do /logout, sign back in, then try a different model. If it’s quota, decide whether waiting for the reset beats paying. If you’re comparing tools anyway, our AI coding tools compared page has the field.

FAQ

What does “Agent execution terminated due to error” mean? The agent’s request failed and older CLI builds hid the real cause, usually network, sign-in or quota, per a maintainer on Google’s GitHub (verified Nov 2, 2026).

Is Antigravity down? Google doesn’t publish an Antigravity status page, so there’s no official way to check; issue #44 has been open since May 20, 2026.

Does a paid plan stop this error? Not published; a paid plan only helps if the hidden cause is quota, since plans raise Antigravity limits.

How do I see the real error behind Agent execution terminated due to error? Update with agy upgrade and check ~/.gemini/antigravity-cli/cli.log, per the maintainer on issue #44.

Does logging out fix it? Several users on issue #44 said /logout and signing back in worked, but the original reporter said it didn’t help them.

Sources

Antigravity CLI GitHub issue #44, “Agent execution terminated due to error” (error text, collaborator reply Aug 25, 2026, user reports): https://github.com/google-antigravity/antigravity-cli/issues/44 (verified 2026-11-02)
Antigravity CLI reference (/logout, /model, /clear, /usage, --log-file, useG1Credits): https://antigravity.google/docs/cli/reference (verified 2026-11-02)
Antigravity CLI troubleshooting (keyring, updater lock; no entry for this error): https://antigravity.google/docs/cli/troubleshooting (verified 2026-11-02)
Antigravity FAQ (support, age, third-party software and Terms of Service): https://antigravity.google/docs/faq (verified 2026-11-02)
Antigravity docs index (no status page listed): https://antigravity.google/llms.txt (verified 2026-11-02)
Antigravity models (Nov 2, 2026 removals of Claude Sonnet 4.6, Claude Opus 4.6, GPT-OSS-120b): https://antigravity.google/docs/models (verified 2026-10-26)
“Individual quota reached” error text, official Antigravity CLI GitHub repo (issue #1340): https://github.com/google-antigravity/antigravity-cli/issues/1340 (verified 2026-10-31)
Google AI plans (Antigravity agent requests by plan): https://one.google.com/about/google-ai-plans/ (verified 2026-10-29)
GitHub issue search for the error string (187 issues across repos): https://github.com/search?q=%22Agent+execution+terminated+due+to+error%22&type=issues (verified 2026-11-01)

The exact error: Agent execution terminated due to error