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System & Developer Instructions

System & Developer Instructions allow your agent to guide how the model should behave within a conversation.

This is done by including special system or developer messages in the conversation history.

These instructions can:

  • Define tone or style (formal, casual)
  • Restrict content types (no code, no personal opinions)
  • Assign persona or role (AI tutor, travel agent, technical support)

🔗 Endpoint​

POST /telexai/chat

Required Headers​

  • X-AGENT-API-KEY: Your API key

  • Model can be specified via:

    • X-Model header
    • model query param
    • model in request body

See Chat Overview for examples.

Scenario Example​

AI Writing Assistant (Formal Tone)​

The agent should always write in a formal tone when replying:

Request:

{
  "messages": [
    {
      "role": "system",
      "content": "You are an AI writing assistant. Always write in a formal tone."
    },
    {
      "role": "user",
      "content": "Write a summary of Telex AI."
    }
  ],
  "stream": false
}

Response:

{
  "status": "success",
  "status_code": 200,
  "message": "chat completed successfully",
  "data": {
    "Messages": {
      "role": "assistant",
      "content": "Telex AI is an advanced artificial intelligence platform that enables developers to create intelligent applications through a flexible API. It supports conversational models, contextual awareness, and real-time interactions."
    }
  }
}

Usage Notes​

  • Roles for special instructions:

    • system (for general model behavior)
    • developer (for technical agents or advanced control)

  • Include these as the first message(s) in the conversation

  • Combine with Contextual Chat for rich multi-turn interactions

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