Antigravity Managed Agent: New Interactions Return 403 After Previously Working

Gemini API
1

I successfully created an Antigravity managed-agent interaction using the documented Gemini Interactions API. Replaying the exact same minimal request now consistently returns:

HTTP 403
permission_denied: The caller does not have permission

Relevant observations:

  • The API key remains valid for ordinary Gemini API requests.
  • The same key can still retrieve the previously completed interaction.
  • Only creation of new Antigravity interactions fails.
  • The request uses antigravity-preview-05-2026, environment: "remote", and a supported underlying model.
  • No warnings or restrictions appear in AI Studio or Cloud Console.
  • This is not reported as a 429 quota error.

Has managed-agent eligibility changed, or could this be an entitlement/provisioning issue? I can provide the project and interaction details privately to Google staff for investigation.

2

Yeah this is super frustrating :confused:

Nah for real I’m switching to Claude and I want my credits refunded

3

Hey folks, seems like a bug, flagged with the team, we’re investigating, should have an update soon.

Edit: this should now be fixed.

4

Funny how Google staff replies instantly to minor API bugs, but stays completely silent on documented GDPR violations.

5

https://archive.ph/mPxo4

https://archive.ph/mPxo4/image

6

This was due to a breakage that happened over the weekend. It should now be fixed, please give it a go and let me know if you run into any issues.

7

Let me ask again, clearly: why is Google still storing deleted user content in its cache? You replied to the other user within minutes. But when it comes to GDPR‑related data retention, suddenly there is silence. If Google cannot provide a legal basis, then this is a GDPR violation. I’m not letting you ignore me, Ali_Cevik.

:one: If they fail to respond to data subject rights (e.g. deletion, access, objection),
this violates GDPR Articles 12, 15, 17, and 21.

:two: If they intentionally continue storing data that was deleted,
this violates GDPR Articles 5(1)(e) and 17.

:three: If they cannot provide a legal basis for storing content that was deleted,
this violates GDPR Article 6.

8

https://archive.ph/q7g33

https://archive.ph/q7g33/image

9

https://web.archive.org/web/20260803112321/https://discuss.ai.google.dev/t/antigravity-managed-agent-new-interactions-return-403-after-previously-working/176850

10

It seems to be working now. Thank you!

11

Awesome.

For folks building with managed agents, our product/engineering team would love to chat with you to learn more about your experience so far and get your feedback about some of the upcoming features. If you’re interested in this, please let me know (feel free to send a note to me at alicevik@google.com)