5 minute read. Published 2026-10-08.
Agent or plain automation? A decision guide
Use the least flexible tool that does the job. Add flexibility only where the task needs judgement.
Three levels
Business processes can be automated at three levels of flexibility. Each adds capability and adds risk.
Level 1: workflow automation
Steps and rules are explicit. Invoice matching with tolerances and approval routing by amount are examples. This is predictable, cheap to run and easy to audit. Use it wherever the rules can be written down.
Level 2: workflow with AI steps
The flow is fixed, but one or two steps use a model: reading a document, classifying an email or drafting a reply. The model's output is checked by rules and confidence thresholds, and uncertain cases go to a person. Most valuable business automation sits here.
Level 3: agents
The model chooses which tools to call and in what order. This helps where the path varies a lot, such as researching a support case across several systems. It is the hardest to test and the most exposed to manipulation, so it needs narrow tools, permissions, limits and approval for consequential actions.
Choosing
- Can you write the steps as rules? Use level 1.
- Is the input unstructured but the steps fixed? Use level 2.
- Does the path depend on what is found along the way? Consider level 3, with approvals.
- Is a wrong action expensive or irreversible? Keep a person in the loop whatever the level.
Start with the lowest level that works and measure. Moving up later is easier than recovering from an agent that was given too much freedom too early.