1Z0-1127-25 LangChain and AI Application Development Practice Question
A team is building an agent using LangChain that needs to perform calculations and search the web for current information. Which combination of tools and agent type should they use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ReAct agent with a calculator tool and a search tool
A ReAct agent reasons step-by-step and uses tools like a calculator for math and a search tool for web queries. The ReAct framework is designed for such tool-use tasks. The other options either omit necessary tools or use an incorrect agent type.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Zero-shot agent with only a calculator tool
Why it's wrong here
Missing a search tool — the agent cannot access current web information.
- ✗
Conversational agent with a search tool and memory
Why it's wrong here
Conversational agents focus on dialogue, not arithmetic; a calculator tool is needed for calculations.
- ✗
ReAct agent with a search tool only
Why it's wrong here
Without a calculator, the agent cannot perform reliable arithmetic; it might attempt to compute via the LLM, which is error-prone.
- ✓
ReAct agent with a calculator tool and a search tool
Why this is correct
ReAct agents combine reasoning and acting; a calculator handles arithmetic, and a search tool retrieves live web data.
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