Paste your API key, define a goal, watch an AI agent work
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When you chat with AI, you get one response. The Agent Builder runs a multi-step loop: it plans a strategy, executes each step, then verifies the result — automatically iterating until the goal is met. It's the difference between asking someone a question and hiring them to complete a project.
All calls go directly from your browser to the provider's API. There is no database, no backend, no accounts. View the page source to verify.
You pay only your API provider's standard rates. A typical 5-step agent run costs $0.01–$0.05 with GPT-4.1 Nano or Gemini Flash, or $0.10–$0.50 with larger models. The cost tracker shows real-time spend.
More steps = more thorough but more expensive. 5 steps is good for simple tasks (write an email, summarize a topic). 10 steps handles complex tasks (research a topic, write a report with sources). The agent stops early if it achieves the goal.
“Research a topic, write a report” — the default. The agent plans steps upfront, executes each one, then verifies. Good for: research, summaries, structured content, analysis. (Based on Plan-and-Execute pattern from Anthropic & OpenAI.)
“Investigate something, debug a problem” — the agent thinks, acts, observes, and adapts after every step. It doesn’t commit to a plan — it figures it out as it goes. Good for: open-ended questions, exploring a topic, debugging, anything where you don’t know the steps yet. (Based on ReAct from Princeton/Google Brain.)
“Write or improve something creative” — generates a first draft, then critiques and revises it up to 3 times. Each revision is informed by specific feedback. Good for: blog posts, emails, code, anything where quality matters more than speed. (Based on Reflexion from Northeastern/MIT.)
“Quick answer, save money” — plans everything in one call, executes in one call. Just 2 API calls total, no matter how complex. Good for: simple questions, brainstorming, when you want to spend the minimum. (Based on ReWOO.)