# Building AI Agents with LLMs: From Prototype to Production

AI Agents create software systems that can reason and execute tasks.
Moving from a prototype to production requires architecture, evaluation,
security, and operational discipline.

## Agent Workflow

``` mermaid
flowchart LR
G[Goal] --> P[Plan]
P --> T[Tool]
T --> O[Observe]
O --> D[Decision]
```

A prototype usually starts with a simple loop to validate the idea.

## Building the Agent Loop

An Agent receives a goal, understands context, selects actions, executes
tools, and evaluates outcomes.

``` ts
while (!task.completed) {
 const action = await agent.plan(task);
 const result = await tool.execute(action);
 task.update(result);
}
```

## From Experiment to Production

Real deployment introduces challenges beyond reasoning ability. Cost,
latency, reliability, and user experience become critical factors.

Context management reduces unnecessary token usage. Caching prevents
repeated requests, while model selection balances quality and
operational cost.

## Evaluation and Testing

Agents are harder to evaluate than traditional software because multiple
outputs can be acceptable. Teams need test scenarios, quality metrics,
and feedback processes.

Production systems should measure accuracy, latency, failures, and
workflow completion rates.

## Security and Observability

Because Agents can call tools, access boundaries are essential. APIs,
databases, and private information require permission controls.

Observability tracks prompts, tool calls, token consumption, and
failures. These signals help teams continuously improve the system.

## Mini Case Study

A development team creates a coding assistant Agent. The prototype only
generates code, but the production version adds project memory,
repository tools, evaluation steps, and logging. The Agent becomes more
useful inside the engineering workflow.

## Best Practices

Start with a narrow problem, measure results, and expand gradually. A
good Agent is not one that does everything automatically. It is a system
that knows when to reason, when to use tools, and when humans should
review decisions.

## Sources

-   OpenAI Agents documentation
-   Anthropic Agent engineering guides
-   LangGraph documentation

## Recommended Development Process

An effective process usually has four stages. First, define a specific
task and limit the Agent scope. Then create a small prototype to
validate model capabilities.

After initial success, teams should add logging, evaluation, and error
handling before scaling. The final stage focuses on cost optimization,
security, and user experience.

## Common Mistakes

A common mistake is trying to create a fully autonomous Agent
immediately. In practice, Agents need clear boundaries and should
request human assistance when necessary.

Another mistake is ignoring input data quality. Powerful LLMs still
depend heavily on the data, tools, and workflows designed around them.

## Recommended Development Process

An effective process usually has four stages. First, define a specific
task and limit the Agent scope. Then create a small prototype to
validate model capabilities.

After initial success, teams should add logging, evaluation, and error
handling before scaling. The final stage focuses on cost optimization,
security, and user experience.

## Common Mistakes

A common mistake is trying to create a fully autonomous Agent
immediately. In practice, Agents need clear boundaries and should
request human assistance when necessary.

Another mistake is ignoring input data quality. Powerful LLMs still
depend heavily on the data, tools, and workflows designed around them.

## Recommended Development Process

An effective process usually has four stages. First, define a specific
task and limit the Agent scope. Then create a small prototype to
validate model capabilities.

After initial success, teams should add logging, evaluation, and error
handling before scaling. The final stage focuses on cost optimization,
security, and user experience.

## Common Mistakes

A common mistake is trying to create a fully autonomous Agent
immediately. In practice, Agents need clear boundaries and should
request human assistance when necessary.

Another mistake is ignoring input data quality. Powerful LLMs still
depend heavily on the data, tools, and workflows designed around them.

## Recommended Development Process

An effective process usually has four stages. First, define a specific
task and limit the Agent scope. Then create a small prototype to
validate model capabilities.

After initial success, teams should add logging, evaluation, and error
handling before scaling. The final stage focuses on cost optimization,
security, and user experience.

## Common Mistakes

A common mistake is trying to create a fully autonomous Agent
immediately. In practice, Agents need clear boundaries and should
request human assistance when necessary.

Another mistake is ignoring input data quality. Powerful LLMs still
depend heavily on the data, tools, and workflows designed around them.