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Retrieval and Its Limits: Building RAG Properly, Then Finding Its Ceiling

Three Things People Confuse: A Protocol, a Technique and a Library

Quiz: Three Things People Confuse: A Protocol, a Technique and a Library

The Naive Build: Sixty Lines, No Framework

Quiz: The Naive Build: Sixty Lines, No Framework

Retrieval Done Properly: Chunking, Hybrid Search and Reranking

Quiz: Retrieval Done Properly: Chunking, Hybrid Search and Reranking

The Same Pipeline Twice: LangChain Versus Plain Python

Quiz: The Same Pipeline Twice: LangChain Versus Plain Python

The Transfer Problem: Why Your Pipeline Is Tuned to a Model

Quiz: The Transfer Problem: Why Your Pipeline Is Tuned to a Model

The Ceiling: What Retrieval Structurally Cannot Detect

Quiz: The Ceiling: What Retrieval Structurally Cannot Detect

Assessment: Write the Diagnosis

Quiz: Assessment: Write the Diagnosis

Previous Lesson

Quiz: Three Things People Confuse: A Protocol, a Technique and a Library

Retrieval and Its Limits: Building RAG Properly, Then Finding Its Ceiling
Three Things People Confuse: A Protocol, a Technique and a Library
Quiz: Three Things People Confuse: A Protocol, a Technique and a Library

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Question 1 of 3

1. Question

Which description is correct?

RAG is a protocol, MCP is a library, LangChain is a technique
Correct Incorrect Correct answer

RAG is a technique, MCP is a protocol, LangChain is a library
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All three are libraries with different vendors
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RAG and MCP are both protocols; LangChain implements them
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Question 2 of 3

2. Question

What is the practical cost of conflating a protocol with a library?

The system runs more slowly
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You cannot tell which layer is responsible for a failure, so you cannot debug or replace either independently
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You are forced to pay for a commercial licence
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Embeddings become less accurate
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Question 3 of 3

3. Question

A CLI and an MCP server expose the same function. What genuinely differs?

The function's return type
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How the caller discovers and invokes it, and what standing context cost it carries
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The programming language it must be written in
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Whether the function can be unit tested
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