> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agenticenv.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# A2A Client

> Build an explicit A2A client with a2aclient.NewClient and register it via WithA2AClients

Same outbound A2A behavior as [A2A Config](/examples/a2a-config), but builds clients explicitly with `pkg/a2a/client` and `WithA2AClients`.

Source: [`examples/agent_with_a2a_client/`](https://github.com/agenticenv/agent-sdk-go/tree/main/examples/agent_with_a2a_client)

## What it demonstrates

* `a2aclient.NewClient` with timeout, token, skill filter options
* Pre-built clients for custom transport wiring
* Same `A2A_*` env vars as config example

## Run

From `examples/`:

```bash theme={null}
go run ./agent_with_a2a_client
go run ./agent_with_a2a_client "What tools do you have available?"
```

## Local server workflow

1. Terminal 1: `go run ./agent_with_a2a_server`
2. Terminal 2: `export A2A_URL=http://localhost:9999` then run this example

Env vars: `A2A_URL`, optional `A2A_TOKEN`, `A2A_HEADERS`, `A2A_ALLOW_SKILLS`, `A2A_BLOCK_SKILLS` — see [Configuration](/examples/configuration).

## Expected output

With `agent_with_a2a_server` running in terminal 1:

```
I can reach a remote agent that exposes skills including echo and calculator.
How can I help you today?
```

## Learn more

<CardGroup cols={2}>
  <Card title="A2A" icon="network-wired" href="/features/a2a">
    A2A feature documentation
  </Card>

  <Card title="A2A Config" icon="gear" href="/examples/a2a-config">
    WithA2AConfig variant
  </Card>
</CardGroup>