#[Error] Hydration

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severe granite
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I used the npx tool to create langgraph ag UI app. Everything generated and started ok but all attempts to load from three different browsers shows Hydration Error

half bridgeBOT
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To fix those hydration errors, here are a few approaches that have worked well:

  1. Initialize state with static values first:
const [isOpen, setIsOpen] = useState(false);
useEffect(() => {
  // Put your client-only logic here
}, []);
  1. Add suppressHydrationWarning to your layout:
<html suppressHydrationWarning>
  <body>{children}</body>
</html>
  1. Only render dynamic content after hydration completes:
const [clientReady, setClientReady] = useState(false);
useEffect(() => { setClientReady(true); }, []);

if (!clientReady) return <div>Loading...</div>;
return <YourDynamicComponent />;
  1. Load dynamic data on the client side only:
const [dynamicData, setDynamicData] = useState(null);
useEffect(() => { 
  loadDynamicData().then(setDynamicData); 
}, []);

return dynamicData ? <Component data={dynamicData} /> : <Placeholder />;

If you're using Next.js, the key thing is making sure your server and client render the same initial state. You can use suppressHydrationWarning for elements that intentionally differ between server and client.
The Next.js hydration docs have more details on this, and you might also want to check out how the project's layout and dev console components handle this—they have some good examples.
Let me know if any of these work for you!

severe granite
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I got it working with a combination of surpressHydrationWarning and --allow-blocking flag for dev:agent script in project-name/package.json

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but that might be somewhat brittle. Given that it was functional after these changes what approach do you recommend?

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The --allow-blocking was to address blockbuster.blockbuster.BlockingError that was occuring in python code possibly due to Gemini genai being the library in use. there was also turbopack warning so I removed turbopack config but I doubt that had much affect.

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This was happening in agent.py the BlockingError

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I see pip list: google-genai 1.5.0
google-generativeai 0.8.5

half bridgeBOT
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From what I can find, your current solution using --allow-blocking seems to be the right approach here. It looks like this is the official workaround LangGraph suggests when third-party libraries (like Google's Gemini client) have unavoidable blocking operations.
A few things I found that might be helpful:

  1. For development: Using --allow-blocking appears to be the recommended approach
  2. For production: It seems you'd want to use the environment variable BG_JOB_ISOLATED_LOOPS=true instead
  3. About the hydration errors: From what I understand, suppressHydrationWarning should handle the React SSR/client mismatch issues
    Is everything working smoothly with your current setup, or are you still running into any issues?
severe granite
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I think so. I will test it a follow up soon

severe granite
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Yes it works. --allow-blocking goes into package.json at end of "dev agent" script for anyone else needing this.

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and page.tsx: <main suppressHydrationWarning={true}

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Thanks. Look forward to trying out more features and exploring AG-UI