--- title: Here's How To Build Fullstack Agent Apps (Gemini,... description: A comprehensive guide to building AI agent applications using Google Gemini, CopilotKit, and LangGraph. Demonstrates creating two practical agents: a Post... canonical: https://daily.dev/posts/0agsrzy0u twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Here's How To Build Fullstack Agent Apps (Gemini, CopilotKit & LangGraph) | daily.dev og:description: A comprehensive guide to building AI agent applications using Google Gemini, CopilotKit, and LangGraph. Demonstrates creating two practical agents: a Post... og:url: https://daily.dev/posts/0agsrzy0u og:image: https://api.daily.dev/og/posts/0agSrZY0U.png og:image:alt: Post cover image og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Here's How To Build Fullstack Agent Apps (Gemini, CopilotKit & LangGraph) **[OpenSouls](https://daily.dev/sources/opensouls)** · [@anmolbaranwal](https://daily.dev/anmolbaranwal) · 49 upvotes · 1 comments ## Summary A comprehensive guide to building AI agent applications using Google Gemini, CopilotKit, and LangGraph. Demonstrates creating two practical agents: a Post Generator that creates LinkedIn/X content using live web search, and a Stack Analyzer that inspects GitHub repositories. Covers the complete architecture from Next.js frontend to FastAPI backend, including state management, tool integration, and structured outputs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#ai](https://daily.dev/tags/ai), [#webdev](https://daily.dev/tags/webdev), [#nextjs](https://daily.dev/tags/nextjs), [#fastapi](https://daily.dev/tags/fastapi), [#langgraph](https://daily.dev/tags/langgraph) [View this post on daily.dev](https://daily.dev/posts/0agsrzy0u) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/0agsrzy0u","headline":"Here's How To Build Fullstack Agent Apps (Gemini, CopilotKit & LangGraph)","text":"Shared: Here's How To Build Fullstack Agent Apps (Gemini, CopilotKit & LangGraph)","url":"https://daily.dev/posts/0agsrzy0u","datePublished":"2025-09-16T21:03:01.405Z","dateModified":"2025-09-16T21:03:41.635Z","author":{"@type":"Person","name":"Anmol Baranwal","url":"https://daily.dev/anmolbaranwal","image":"https://avatars.githubusercontent.com/u/74038190?v=4","description":"Just a tech guy who loves writing and building cool stuff","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":21440}},"image":"https://media.daily.dev/image/upload/s--VDukGCjf--/f_auto/v1722860399/public/Placeholder%2002","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":49},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":1}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/SnkvfmUR8"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/squads/opensouls","name":"OpenSouls"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"OpenSouls","item":"https://daily.dev/squads/opensouls"},{"@type":"ListItem","position":3,"name":"Here's How To Build Fullstack Agent Apps (Gemini, CopilotKit & LangGraph)"}]} ```