Flowcharts

A flowchart is a diagram that lays out a process, workflow, or algorithm as a sequence of steps connected by arrows, using a small vocabulary of standardized shapes — rectangles for actions, diamonds for decisions, ovals for start and end. It is one of the oldest and most durable ways to make a process legible at a glance, predating software but perfectly suited to describing it. The value is that a whole flow of logic becomes something a person can follow with their eyes rather than trace through prose.

• Standardized shapes - Consistent symbols for processes, decisions, inputs, and terminators keep diagrams readable across teams.
• Directional flow - Arrows show the order of operations and where branches diverge and rejoin.
• Decision branching - Diamond nodes capture the conditional logic that shapes which path a process takes.
• Process documentation - A shared picture of how something actually works, useful for design, onboarding, and review.

In API work, flowcharts show up wherever a sequence needs to be understood before it is built or governed — OAuth and authentication handshakes, request/response lifecycles, webhook retries, and multi-step integrations. They are the human-readable cousin of machine-executable workflow formats, sketching the same logic that an Arazzo workflow or state machine later encodes. As more of that logic gets handed to autonomous agents, a clear flowchart remains one of the fastest ways for a person to reason about what a process is supposed to do before trusting a machine to run it.