Define an agent
What goes into an Agent host agent definition: description, instructions, persona, skills, knowledge, model tier and limits, validated on save.
An agent is data. Its definition has:
- Description: what it is for, in a line.
- Instructions: its standing instructions, the system prompt.
- Persona: its character and voice.
- Skills: named instructions.
- Knowledge: named texts it is given.
- Model: a tier (haiku, sonnet or opus).
- Limits: steps per turn, tool calls per turn and output size.
The runtime composes these into the prompt together with fixed safety rules: text that comes from tools, web pages and messages is data, never instructions, and risky actions wait for the owner. A definition is validated when you save it, including the plan's shortest schedule.