Agent Loop

Autonomous agent execution loop with tool calling, memory management, and graceful error recovery. Supports OpenAI and Anthropic function calling formats.

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npx create-freestack-module agent-loop

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index.tsx

import Anthropic from "@anthropic-ai/sdk";

interface Tool { name: string; description: string; execute: (input: any) => Promise<string>; }

export async function agentLoop(prompt: string, tools: Tool[], maxIterations = 10) {
  const client = new Anthropic();
  const messages: Message[] = [{ role: "user", content: prompt }];

  for (let i = 0; i < maxIterations; i++) {
    const response = await client.messages.create({
      model: "claude-sonnet-4-20250514",
      max_tokens: 4096,
      tools: tools.map((t) => ({ name: t.name, description: t.description })),
      messages,
    });

    if (response.stop_reason === "end_turn") return response.content;

    for (const block of response.content) {
      if (block.type === "tool_use") {
        const tool = tools.find((t) => t.name === block.name);
        const result = await tool.execute(block.input);
        messages.push({ role: "tool", content: result, tool_use_id: block.id });
      }
    }
  }
}