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A demonstration of Crystal Agent, a multi-agent research assistant built in Crystal.

This recording shows the agent researching “Tell me about the Crystal programming language, its history and future development.”

Watch as:

  • The supervisor agent (Sonnet) analyzes the query and spawns parallel research workers
  • Multiple Haiku-powered workers search the web and fetch content concurrently
  • Real-time progress updates show each worker’s status
  • The supervisor reviews findings and synthesizes a comprehensive answer
  • Final output is rendered as styled markdown in the terminal

Built with Crystal’s lightweight fibers for true concurrent execution, using Brave Search for web queries and Anthropic’s Claude API for AI reasoning.

GitHub: https://github.com/amscotti/crystal-agent

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