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Dev.to
Dev.to
7/4/2026
How to Build Your First Self-Running AI Agent in 15 Minutes

How to Build Your First Self-Running AI Agent in 15 Minutes

Short summary

Learn to build autonomous AI agents using prompt engineering alone—no code, frameworks, or external APIs required. The technique shifts how LLMs process requests by structuring prompts to decompose complex goals into ordered sub-tasks, execute them, and evaluate output for self-correction. Mission clarity is everything: vague goals fail, but specific scope, format requirements, and terminal conditions produce precise agent behavior.

  • Build AI agents with just a prompt structure—no code, frameworks, or external tools required
  • Core mechanism: decompose → execute → evaluate → iterate loop shifts model from single-pass to autonomous behavior
  • Success factor: mission statements must specify scope, deliverable format, and explicit terminal condition

Generated with AI, which can make mistakes.

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