# Agentic AI system

**URL:** <https://community.deeplearning.ai/t/agentic-ai-system/887462>\
**Category:** Agentic AI\
**Tags:** dl-ai-learning-platform, week-module-5\
**Created:** [January 20, 2026, 12:30pm UTC](https://community.deeplearning.ai/t/agentic-ai-system/887462 "2026-01-20T12:30:26Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Yiyi](https://avatars.discourse-cdn.com/v4/letter/y/e56c9b/32.png) [@Yiyi](https://community.deeplearning.ai/u/Yiyi)\
**Post date:** [January 20, 2026, 12:30pm UTC](https://community.deeplearning.ai/t/agentic-ai-system/887462/1 "2026-01-20T12:30:27Z")

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**I’ve completed the excellent course and I have two questions. 1. I find some Agentic systems have two roles (system role and user role), but some only have user role, so what’s the reason? 2. After completing graded labs, I can’t modify any codes to test different results. Thanks**

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**Author:** ![reinoudbosch](https://avatars.discourse-cdn.com/v4/letter/r/22d042/32.png) [@reinoudbosch](https://community.deeplearning.ai/u/reinoudbosch)\
**Post date:** [January 20, 2026, 2:12pm UTC](https://community.deeplearning.ai/t/agentic-ai-system/887462/2 "2026-01-20T14:12:48Z")

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Hi Yiyi,

The default system role of LLMs is often set to ‘be a helpful assistant’. This setting can be very useful for interactions that are not too specialized. When a specialized topic comes up, e.g., when an LLM is to be used as a coding model, it can be very useful to set the system role to something like ‘You are an expert developer’, or the like. This activates that part of the LLM where attention to coding is high, and you can get more specialized answers.

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**Author:** ![carlosrl](https://avatars.discourse-cdn.com/v4/letter/c/2acd7d/32.png) [@carlosrl](https://community.deeplearning.ai/u/carlosrl)\
**Post date:** [January 21, 2026, 1:07am UTC](https://community.deeplearning.ai/t/agentic-ai-system/887462/3 "2026-01-21T01:07:05Z")

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Hi @Yiyi ,

I am not sure about your comment _ **cannot modify code,** _ once that in some lessons the learner motivated to change options, parameters, to see different results. In addition, you can download the entire lesson and run in your local computer.  
Keep learning!

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**Author:** ![Deepti\_Prasad](https://sea1.discourse-cdn.com/dlai/user_avatar/community.deeplearning.ai/deepti_prasad/32/165831_2.png) [@Deepti\_Prasad](https://community.deeplearning.ai/u/Deepti_Prasad)\
**Post date:** [January 21, 2026, 9:41am UTC](https://community.deeplearning.ai/t/agentic-ai-system/887462/4 "2026-01-21T09:41:53Z")

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hi @Yiyi

1. **When an Agentic System Uses System and User Roles (Dual Roles)**

This type of agentic system allows sophisticated autonomy and complex workflows

- **System Role (The ‘Manager’ or ‘Persona’):** Defines the AI’s identity, constraints, goals, and expertise (For example **“You are a helpful travel assistant, prioritize sustainable options”** )
- **User Role (The ‘Request’ or ‘Data’):** Provides the specific task or data (for example **“Book a trip to Kyoto for next month”** ).
- **When to Use:** For complex, multi-step tasks, project management, personalized customer service, or anything requiring planning, context, and goal-directed action (e.g., analyzing market trends, drafting campaigns)

1. **When an Agentic System Uses Only the User Role (Single Role)**

In a user only agentic system, the system functions more like a powerful tool, and not just as aautonomous agent.

- **User Role (The ‘Command’):** The user provides direct input, and the AI responds based on its training and context, without a pre-defined, persistent persona or complex goal.

- **When to Use:**

**Main Difference: Autonomy versus Responsiveness**

- **Dual Roles:** Creates an _ **agent** _ that plans, decides, and acts autonomously (like a manager deciding which technicians to use).

- **Single Role (User Only):** Creates a _ **tool** _ that responds to direct commands (like a technician doing a specific job)

Regards

DP

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**Author:** ![Yiyi](https://avatars.discourse-cdn.com/v4/letter/y/e56c9b/32.png) [@Yiyi](https://community.deeplearning.ai/u/Yiyi)\
**Post date:** [January 22, 2026, 5:32am UTC](https://community.deeplearning.ai/t/agentic-ai-system/887462/5 "2026-01-22T05:32:00Z")

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Good explanations, Thanks!

Deepti Prasad \<[notifications@dlai.discoursemail.com](mailto:notifications@dlai.discoursemail.com)\> 於 2026年1月21日週三 下午5:51寫道：