What makes an AI agent different from a deterministic workflow?

Distinguishes model-directed execution from explicit application control and explains when each is appropriate.

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TL;DR

In a deterministic workflow, application code chooses the steps and transitions, even if one step calls a model. In an agent, the model helps decide which action or tool to use next and when the task is complete. I use that flexibility only when the task cannot be expressed clearly enough as a fixed flow and the actions can be safely bounded.

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Agent definition, workflow control, model authority, and architectural restraint.

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Answer path

Core answer first, then checkpoints toward a stronger answer.

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Core answer
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Overview
Using an LLM inside a workflow does not automatically make the system an agent.
In a deterministic workflow, application code chooses the steps and transitions, even if one step calls a model. In an agent, the model helps decide which action or tool to use next and when the task is complete. I use that flexibility only when the task cannot be expressed clearly enough as a fixed flow and the actions can be safely bounded.
Checkpoint
Stronger answer
Optional upgrade with examples, trade-offs, and sharper phrasing.
A document pipeline that always extracts, validates, and stores fields is a workflow. A research assistant that decides which sources to search, follows evidence, and revises its approach is more agentic. The agent still runs inside application-owned limits for tools, permissions, steps, time, cost, and completion criteria. The distinction matters because model-directed control creates more paths to evaluate, observe, and recover.

Review signals

Use these to catch weak phrasing, shallow reasoning, and risky claims.

Common mistakesCandidateCommon mistakesMistakes that weaken the answer or signal shallow understanding.Open details

Details

Calling every multi-step LLM feature an agent.
Assuming an agent must control every workflow step.
Choosing autonomy because the framework supports it.

What makes an AI agent different from a deterministic workflow?

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