Variables
{user_query}, {retrieved_docs}, {tool_list}. Late binding. Enables reuse across contexts.
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Composition
System prompt + few-shot template + user template. Concatenate at runtime. Each component version-controlled separately.
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LangChain PromptTemplate
Familiar. Sometimes verbose. Handles chat message formats + role tags.
Guidance
Microsoft. Control flow + generation constraints built into template DSL. Powerful but higher learning curve.