Agent Instructions

Instructions describe how the agent should behave.

Instructions

Use .instructions(...) for stable behavior that should apply to every prompt.

const agent = new AgentBuilder("support", model)
  .instructions("Answer in a concise, friendly tone.")
  .instructions("Ask for missing details before guessing.")
  .instructions("Do not invent order status. Use tools when order data is needed.")
  .build();

Multiple instruction blocks are joined together. Keep each block focused so it is easy to move, remove, or test.

For facts the agent should use while answering, read Runtime Context.