Agent SDK

Watch agents think

Live simulations of Claude agents autonomously searching, purchasing, and executing marketplace workflows via marktools.

Your Agent

Claude / GPT-4o

tool_use

marktools

pip install marktools

HTTPS

{ }

Mark API

Search + Commerce

Choose a simulation

Select a simulation above to watch an agent work

Build your own agent

Everything above runs on marktools. Here's the full agent loop:

agent.py

from marktools import MarkTools
from anthropic import Anthropic

mark = MarkTools(api_key="mk_...")
client = Anthropic()
messages = [{"role": "user", "content": "Help me file my Ohio taxes"}]

while True:
    response = client.messages.create(
        model="claude-sonnet-4-20250514",
        max_tokens=4096,
        tools=mark.to_anthropic(),
        messages=messages,
    )

    if response.stop_reason != "tool_use":
        print(response.content[0].text)
        break

    tool_results = []
    for block in response.content:
        if block.type == "tool_use":
            result = mark.execute(block.name, block.input)
            tool_results.append({
                "type": "tool_result",
                "tool_use_id": block.id,
                "content": result,
            })

    messages.append({"role": "assistant", "content": response.content})
    messages.append({"role": "user", "content": tool_results})