--- title: Gemini API in Ruby: Building AI Agents Without an SDK description: A practical guide to building Gemini AI agents in Ruby on Rails without an official SDK. Covers using the Gemini Interactions API over generateContent,... canonical: https://daily.dev/posts/gemini-api-in-ruby-building-ai-agents-without-an-sdk-7psccge0x twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Gemini API in Ruby: Building AI Agents Without an SDK | daily.dev og:description: A practical guide to building Gemini AI agents in Ruby on Rails without an official SDK. Covers using the Gemini Interactions API over generateContent,... og:url: https://daily.dev/posts/gemini-api-in-ruby-building-ai-agents-without-an-sdk-7psccge0x og:image: https://api.daily.dev/og/posts/7PSCCge0X.png og:image:alt: Gemini API in Ruby: Building AI Agents Without an SDK 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. # Gemini API in Ruby: Building AI Agents Without an SDK **[Ruby Flow](https://daily.dev/sources/rubyflow)** · 25 min read · 1 upvotes · 0 comments ## Summary A practical guide to building Gemini AI agents in Ruby on Rails without an official SDK. Covers using the Gemini Interactions API over generateContent, building a Faraday HTTP client, function calling with a tool registry, server-side state via previous_interaction_id, background job execution, streaming events, authorization inside tools, write tool confirmation patterns, observability with agent_runs/agent_steps tables, and production guardrails including iteration caps and state machines. Also addresses the store/background tradeoffs, Developer API vs Enterprise Agent Platform decision, and fixture-based testing strategies. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#llm](https://daily.dev/tags/llm), [#ai-agents](https://daily.dev/tags/ai-agents), [#rails](https://daily.dev/tags/rails), [#google-gemini](https://daily.dev/tags/google-gemini) [View this post on daily.dev](https://daily.dev/posts/gemini-api-in-ruby-building-ai-agents-without-an-sdk-7psccge0x) ```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":"TechArticle","headline":"Gemini API in Ruby: Building AI Agents Without an SDK","url":"https://daily.dev/posts/gemini-api-in-ruby-building-ai-agents-without-an-sdk-7psccge0x","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/gemini-api-in-ruby-building-ai-agents-without-an-sdk-7psccge0x"},"datePublished":"2026-06-29T20:55:00.242Z","dateModified":"2026-06-29T20:55:49.734Z","description":"A practical guide to building Gemini AI agents in Ruby on Rails without an official SDK. 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