What Is Claude Code’s Agent Feature? What Changed and How to Use It

Claude Code's agent feature sounds useful, but at first it is hard to see what actually changes.

The most common confusion is between:

using Claude in one normal thread
using agents and subagents to split work by role

This article explains what the agent feature is, how it differs from the older one-thread workflow, and how to start with /agents.

The short version

Claude Code's agent feature makes it easier to split work by role instead of doing everything in one conversation.

According to Anthropic's Create custom subagents, subagents are specialized assistants for specific kinds of work. A simple beginner framing is this: Claude can use small role-based helpers inside the larger workflow.

That is the main difference.

What changed from the older workflow

The older pattern was to do everything in one thread:

discuss the spec
request implementation
ask for debugging
ask for review

That works, but the thread becomes messy more easily.

The agent workflow changes that.

In practice, it is a shift from one assistant doing everything to a structured workflow with narrow responsibilities.

It is `/agents`, not `/agent`

This is worth stating clearly.

In Anthropic's slash commands docs, the command is listed as /agents, not /agent.

/agents

This is the place where you can view and create subagents.

What subagents are

Subagents are narrow role-based helpers.

For example:

debugger
reviewer
test-runner

Anthropic explains that subagents have separate context windows. That matters because it helps keep the main thread cleaner and more focused.

Why the agent feature is useful

The simple benefit is that you do not need to force every kind of work into one thread.

Without role separation, these things get mixed:

investigation
implementation
review
follow-up decisions

With the agent workflow, it is easier to do this:

decide the goal in the main thread
give one narrow task to a subagent
bring the result back and decide what to do

That is why it is better understood as an organization feature, not a magic automation button.

Your first agent should probably be a debugger

For most beginners, debugger is the easiest first subagent.

Reasons:

the role is narrow
the result is easier to judge
it drifts less than a general implementation role

Example:

Name: debugger

Description:
Focused on investigating the cause of errors first

Instructions:
Look at the error, reproduction steps, and related files.
Prioritize identifying likely causes before making large changes.
Start with the smallest reasonable fix.
If the cause is still unclear, list the next places to inspect.

A simple way to start

1. Open Claude Code

claude

2. Open `/agents`

/agents

3. Create a new agent

You will choose between project-level and user-level.

Type	Scope	Best for
project-level	Only the current project	Trying one role inside one codebase
user-level	All your projects	Reusing the same role everywhere

For beginners, project-level is usually enough.

4. Keep it to one role

Bad examples:

one agent that does everything
one agent that plans, implements, reviews, and tests

Better examples:

debugger
reviewer
test-runner

5. Test with a small request

For example:

Use debugger to investigate the cause of this error.

Or:

Use debugger to narrow down which recent change is most likely responsible.

Start small.

Common beginner mistakes

Treating agent and subagent as exactly the same thing

They are closely related, but not identical. The agent feature is the broader workflow idea. Subagents are the specific role-based helpers you create inside it.

Making the role too broad

If the role does everything, the original confusion comes back.

Letting the subagent make the final decision

It is usually better to bring the result back and make the final judgment in the main thread.

What is enough to remember

At the beginning, this is enough:

the entry point is /agents
start with one subagent
keep the role narrow
review the result yourself

FAQ

Is it `/agent` or `/agents`?

As of April 4, 2026, the Anthropic slash commands docs list /agents.

Do I need subagents to use Claude Code?

No. They are optional. But they become more useful as work gets more complex.

Should I create several subagents right away?

Probably not. Start with one clear role first.

Summary

Claude Code's agent feature makes it easier to organize work by role instead of pushing everything through one thread.

If you want the clearest first step, open /agents, create one narrow helper such as debugger, and try it on one small task.