antigravity-preview-05-2026 Managed Agent Loses Basic Tool Access After an Hour

[theoswallis]

Hi there! I've reported this a few different places but haven't seemed to figure out where the actual correct place is, so apologies if this is another miss!

Environment details

• Programming language: Typescript
• OS: Windows
• Language runtime version: Node v24.16.0
• Package version: @google/genai ^2.3.0

Steps to reproduce

(I've been specifically developing with stream: true, so stream: false or background: true are untested)

1. Call GoogleGenAi.interactions.create with agent: "antigravity-preview-05-2026", input: anyPrompt, and stream: true. capture the interactionId and environmentId
2. Wait an hour
3. Call again, passing in stream:true and the interactionId and environmentId, and a prompt like "write a hello-world script, read it, run it, then delete it"
4. Capture the response stream.

Expected: Agent writes/reads/runs/deletes a hello-world script
Observed: Agent begins receiving 401 Unauthorized errors in response to basic internal tools (read_file, write_file, delete_file, code_execution) and is unable to perform any task, resorting to simple text-out behavior and describing what it would do if tools were working.

I hope this gets where it needs to go, if this is the right place and any extra information is needed, let me know!

[Varun-S10]

Hi @theoswallis, Thank you for raising this issue. Could you please try upgrading the @google/genai package to the latest version?
If you still experience the issue after upgrading, please let us know:
1.Whether you are using the Gemini API key or Vertex AI.
2.A minimal reproducible code that will help us investigate further.

[theoswallis]

Hello @Varun-S10! I am using a Gemini API key. I installed the latest version and ran the following code to verify that the issue was still occurring. Unfortunately I am still seeing the same issue. Here's the minimal reproducible code:

import { GoogleGenAI } from '@google/genai';
import 'dotenv/config';

const ai = new GoogleGenAI({ apiKey: process.env.GEMINI_API_KEY });

async function reproduceIssue() {
    console.log('Initializing streaming interaction');
    const stream1 = await ai.interactions.create({
        agent: 'antigravity-preview-05-2026',
        input: 'Initialize session',
        environment: { type: 'remote' },
        stream: true,
    });

    let interactionId: string | undefined;
    let environmentId: string | undefined;

    for await (const chunk of stream1 as AsyncIterable<any>) {
        if (chunk.interaction?.id) {
            interactionId = chunk.interaction.id;
        }
        if (typeof chunk.interaction?.environment_id === "string") {
            environmentId = chunk.interaction.environment_id;
        }
    }

    console.log(`interactionId: ${interactionId}, environmentId: ${environmentId}`);
    console.log('Waiting 1 hour...');
    await new Promise((resolve) => setTimeout(resolve, 60 * 60 * 1000));
    console.log('Send second turn prompt after 1 hour...');
    const stream2 = await ai.interactions.create({
        agent: 'antigravity-preview-05-2026',
        input: 'write a hello-world script, read it, run it, then delete it',
        stream: true,
        previous_interaction_id: interactionId,
        environment: environmentId,
    });

    for await (const chunk of stream2) {
        console.log('Stream chunk:', JSON.stringify(chunk, null, 2));
        // You can see the agent struggling with internal tool calls here
    }
}
reproduceIssue().catch(console.error);```