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An agent is a model with instructions and a set of tools. Agents do the work inside workflows. Click Agents in the sidebar to see your library.
The Create agent form with details, instructions, and tools

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Built-in and custom agents

  • Built-in agents power Research, Slack, PR review, repository learning, and security hunts. You can change their model and reasoning level for your organization. Click Reset to default to undo.
  • Custom agents are yours. You control everything, including the prompt and tools.

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Create an agent

1

Open the form

Click Create agent.
2

Describe the agent

Enter a Name, an optional Description, and pick a Model and Reasoning level.
3

Write the instructions

In System prompt, define the agent’s role, focus, and how it should respond.
4

Pick tools and save

Select the tools it needs, then click Create agent.
You can also keep an agent from a workflow proposal. Click Save to agent library on its Agents tab.

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Models

The default is Sonnet 5.5. Reasoning level sets how much the model thinks before it answers: Default, Low, Medium, High, Extra high, or Max. Higher is slower and costs more. It isn’t available for Haiku 5.5 or the Kimi, GLM, and DeepSeek models.

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Tools

Use the search box to find a tool, or check Show tool IDs to see each tool’s ID.