Developer Builds Autonomous AI Agent Using Claude's Tool-Use Loop

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A developer shared how they built a functional AI agent using Anthropic's Claude model by placing it in a loop and equipping it with tools like web search, SQL queries, a calculator, and file access. The agent autonomously decides which tools to use and in what order, continuing until it produces a final answer. Security measures were built in, including read-only SQL access, AST-based math parsing to block code injection, and restricted file access confined to the project folder. The project, published on GitHub as claude-research-agent, also includes a FastAPI web interface that displays the agent's tool-use trace. The developer noted that watching the agent chain multiple tool calls independently was what made the concept of an AI agent finally feel concrete.

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