Authoring Instructions

The system prompt defines your agent's personality, behavior, and domain knowledge.

Flue-native

Set instructions via createAgent:

import { createAgent } from '@flue/runtime'

export default createAgent({
  instructions: 'You are a helpful order support agent. Always cite order numbers.',
})

Eve-style (declarative)

Create agent/instructions.md:

You are a helpful order support agent. Always cite order numbers.

Run npx flue-eve init to inline these instructions into the generated Flue agent definition.

Best practices

• Be specific about the agent's role and domain
• List what the agent should do and should not do
• Mention available tools and when to use them
• Keep it under 2,000 characters for optimal response quality

See authoring model for how the two authoring styles relate.