AI agents vs workflows: what's the difference?
Workflows execute a fixed graph of steps you built in Zapier, n8n, Make, or Gumloop. Agents read the situation, pick tools, and decide what to do next using an LLM. The split matters because most real automation needs both: workflows for the parts you can predict, agents for the parts you can't.
Anthropic frames the line cleanly: workflows are systems where LLMs and tools run through predefined code paths, agents are systems where the LLM directs its own control flow. Gumloop's version is the quarterback analogy: the agent reads the play and picks the workflow to run. A 200-Zap library is not about to evaporate. Most of those Zaps should stay Zaps.
At a glance
| Aspect | Workflow (Zapier, n8n, Make) | Agent (Gumloop, Lindy, LangChain) |
|---|---|---|
| Control flow | Wired in the builder | LLM picks each step at runtime |
| Branching | If/else nodes you defined | Decided per run based on context |
| Error handling | Retry, dead-letter, alert | Reasoning over the error, may re-plan |
| Variable input shape | Breaks on schema drift | Reads loosely-structured input |
| Failure mode | Step throws, run halts | Loops, hallucinates a tool call, drifts off goal |
When to keep it a workflow
Lead enrichment that hits Clearbit then writes to HubSpot. Stripe webhook to Slack alert. Form submission to Notion row. The steps are knowable, the inputs are typed, the win condition is "every event processed exactly once." An agent here is slower, more expensive, and less reliable. An HN comment: a developer built an agent for binary search, realized most steps "don't require AI at all," and the model produced random errors.
When to reach for an agent
Inbound replies where every email needs a different next action. Research tasks where the next query depends on what the last one returned. Support triage where the agent reads a ticket, checks three systems, and either resolves it or routes it. The steps aren't knowable upfront, that's the whole point.
How to choose
Ask one question: can you draw the flowchart? If yes, build a workflow. If the flowchart has "...it depends" branches you can't enumerate, an agent earns its cost. Gumloop's rule of thumb works: start with workflows, graduate to agents, then let agents call workflows as tools.
Last updated: May 20, 2026