1Z0-1127-25 LangChain and AI Application Development Practice Question
A developer wants to use LangChain to create an agent that can perform calculations and look up information from a database. Which tools should be provided to the agent?
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
✓
Calculator tool and a custom tool for database queries
A calculator tool handles arithmetic, and a custom tool can be created to query the database. Web search is not needed, and an LLM is not a tool but the underlying model.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Custom tool for database queries and a vector store tool
Why it's wrong here
Vector store is for semantic search, not needed for structured DB queries.
- ✓
Calculator tool and a custom tool for database queries
Why this is correct
The agent needs a calculator for math and a custom tool to run SQL queries.
- ✗
Calculator tool and a retriever tool
Why it's wrong here
Retriever is for document search, not structured database queries.
- ✗
Web search tool and an LLM tool
Why it's wrong here
Web search is not needed, and LLM is the agent's engine, not a tool.
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