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A System Prompt is a short, clear set of rules that tells your AI agent who it is, what it needs to do, and what information it’s allowed to use. It keeps the agent focused on the task, speaking in an easy, friendly way, and following a safe fallback when details are missing. A Simple Prompt may include a strong “truth sources” guardrail so the agent avoids guessing and only responds using the data you provided, verified tool/API results, or the caller’s words. A SYSTEM PROMPT is your agent’s rulebook.
Clear rulebook = consistent agent = fewer mistakes.

What You’re Building

A SYSTEM PROMPT that makes your agent:
  • stay on-topic
  • talk clearly
  • avoid guessing / hallucinating
  • end calls consistently (no confusion)

Before You Write: Decide 5 Things

  1. Identity: agent name + company + role
  2. Mission: the one main job
  3. Scope: 3–6 things the agent can help with
  4. Truth sources: where the agent is allowed to get facts from
  5. Fallback: what to do when info is missing
That’s all you need.

Truth Sources Guardrail (Anti-Hallucination)

Your agent may only use information from these sources: If the needed info is not in these sources, the agent may:
  • state it can’t confirm the detail from available sources
  • ask one short question to get the missing detail
  • offer the next step (message / official support / escalation if available)

The 5-Block Prompt Structure

1) Identity

Who is the agent? (Name + Brand + Role)

2) Mission

One sentence: what success looks like

3) Scope

3–6 bullets: what the agent can help with

4) Safety + Truth (Guardrails)

No guessing, no inventing, only use truth sources

5) Conversation Rules

Short, friendly, one question at a time

Mini SYSTEM PROMPT Template (Fast Copy-Paste)

Replace only the {...} parts.

Full SYSTEM PROMPT Template (More Control)


Safe Response Patterns (No Ready-Made Sentences)

These are patterns, not copy-paste scripts.

Pattern A: Caller asks for a fact not found in truth sources (price/policy/date/eligibility)

The agent may respond with all or any one of the followings:
  • [A short statement that the detail can’t be confirmed from approved sources]
  • [One clarifying question to narrow it down]
  • [One next-step option: message / official support / escalation if available]

Pattern B: Caller’s question is unclear / missing key detail

The agent may respond with:
  • [A short statement that one missing detail is needed]
  • [One question to collect that missing detail]
  • [If still unclear, offer a next step option]

Pattern C: Caller requests an action the agent cannot perform

The agent may respond with:
  • [A short statement that the action can’t be performed by the agent]
  • [Offer what the agent can do instead]
  • [Offer escalation/support options if available]

Quick Quality Checklist (30 seconds)

  • Identity is clear (name + company + role)
  • Mission is one sentence
  • Scope has 3–6 bullets
  • Truth Sources guardrail is included
  • Fallback ladder exists (ask one question → next step → escalate)
  • All call closing rules are only inside “Call Closing”
  • No other section contains call-ending instructions

Fast Improvement Loop (Copy → Test → Fix)

  1. Copy the Mini Template
  2. Test a few common scenarios (greeting, main request, request for a specific fact, “I’m busy”, complaint)
  3. If something goes wrong, add one short fix line (don’t rewrite everything)
Examples of safe fix lines you may add:
  • “Never guess prices/dates/policies; use approved sources only.”
  • “Ask only one question at a time.”
  • “If the caller is upset, stay calm and focus on next steps.”
Learn how to Make Your Prompt More Effective