[BUG in Google Antigravity] Claude models fail with “Agent execution terminated” error when Firebase MCP Tool #15 is enabled

Google Antigravity
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1

Bug description:
In Google Antigravity, there is a critical execution conflict between the Firebase MCP server and Anthropic Claude models (Sonnet/Opus). When Firebase MCP Tool #15 (functions_get_logs) is enabled, Claude models fail to execute any prompt, whereas Google Gemini models continue to function correctly.

Note:
I’ve already reported this to Google through the Feedback button in Antigravity.
Also, I have several other MCPs still enabled, so it doesn’t seem to be a general issue with MCPs.

Workaround:
Disabling Tool #15 in the Firebase MCP management settings resolves the issue immediately.

To Reproduce Steps to reproduce the behavior:
Open the Agent sidebar (Ctrl+L).
Click the 3-dots icon (top right) > MCP servers.
Click Manage MCP Servers.
Select the Firebase MCP.
Ensure Tool #15: “functions_get_logs” is toggled ON.
Switch the model to Claude Sonnet or Claude Opus.
Send any prompt.
Observe the error.

Actual Result
The agent fails immediately with the error: “Error: Agent execution terminated due to error”.

Expected Result
The agent should execute the prompt successfully. The presence of the “functions_get_logs” tool definition should not crash the Claude models.

Environment:
IDE: Google Antigravity ()
MCP Server: Firebase
Models Affected: Claude Sonnet, Claude Opus
Models Not Affected: Google Gemini series

(**)
Google Antigravity Version: 1.13.3
VSCode OSS Version: 1.104.0 (user setup)
Commit: 94f91bc110994badc7c086033db813077a5226af
Date: 2025-12-19T21:03:14.401Z
Electron: 37.3.1
Chromium: 138.0.7204.235
Node.js: 22.18.0
V8: 13.8.258.31-electron.0
OS: Windows 11 (Windows_NT x64 10.0.26200)
Language Server CL: 846830895

2 Likes
3

Hello @paulvancotthem,

Are you still facing the issue with the Claude models?

To ensure our engineering team can investigate and resolve these issues effectively, we highly recommend filing bug reports directly through the Antigravity in-app feedback tool. You can do this by navigating to the top-right corner of the interface, clicking the Feedback icon, and selecting Report Issue.

5

Please read the Note in my OP?

And yes, still experiencing this bug.

7

I have the same bug with a custom mcp server. As soon as it is enabled, all claude models give an error.

8

I can confirm the same issue as of today, 1/13/2026 10:21pm gmt+8

9

Thank you for reporting the issue. We have logged this as a bug internally.

To help us prioritize this issue, please provide any further details or images that might help us reproduce it.

11

* UPDATE: seems to be solved now. *

12

저는 클로드를 사용하지 않고 제미나이 플래시 사용중에 있는데 문제가 발생합니다. 울트라 구독자의 가족원으로 사용중에 있습니다.