NOTE
Sequence Diagrams
Modeling time-ordered interactions, calls, asynchronous messages, branches, and failure paths between participants.
This is a historical learning note and may contain outdated or incomplete understanding.
A sequence diagram shows interactions between participants over time. It is useful for request paths, RPC/message flows, transactions, retries, callbacks, and asynchronous workflows.
Model the participants that matter, distinguish synchronous calls from asynchronous messages, and include important alternatives such as timeout, retry, compensation, and failure. The diagram should clarify protocol semantics rather than merely mirror every function call.