What can I automate with A2A in Sim?

With Sim you can: Send Message; Get Task; Cancel Task; Get Agent Card; Resubscribe; and 3 more tools. Each action runs inside an AI agent block, so you can combine A2A with LLM reasoning, conditional logic, and data from any other connected service.

How do I connect A2A to Sim?

Getting started takes under five minutes: (1) Create a free account at sim.ai. (2) Open your workspace and create an agent. (3) Drag a A2A block onto the workflow builder. (4) Add your API key to authenticate — find it in your account settings. (5) Choose the tool you want to use, wire it to the inputs you need, and click Run. Your agent is live.

Can I use A2A as a tool inside an AI agent in Sim?

Yes — this is one of Sim's core capabilities. Instead of hard-coding when and how A2A is used, you give an AI agent access to A2A tools and describe the goal in plain language. The agent decides which tools to call, in what order, and how to handle the results. This means your automation adapts to context rather than breaking when inputs change.

How do I send message with A2A in Sim?

Add a A2A block to your agent and select "Send Message" as the tool. Fill in the required fields — you can reference outputs from earlier steps, such as text generated by an AI agent or data fetched from another integration. No code is required.

What A2A tools does Sim support?

Sim supports 8 A2A tools: Send Message, Get Task, Cancel Task, Get Agent Card, Resubscribe, Set Push Notification, Get Push Notification, Delete Push Notification.

Is the A2A integration free to use?

Yes — Sim's free plan includes access to the A2A integration and every other integration in the library. No credit card is needed to get started. Visit sim.ai to create your account.

Back to Integrations

A2A

Interact with external A2A-compatible agents

View docs

Overview

Use the A2A (Agent-to-Agent) protocol to interact with external AI agents.

How to automate A2A with Sim

Create a free account
Sign up at sim.ai in seconds. No credit card required. Your workspace is ready immediately.
Add a A2A block
Open your workspace, drag a A2A block onto the workflow builder, and paste in your A2A API key.
Configure, connect, and run
Pick the tool you need, wire in an AI agent for reasoning or data transformation, and run. Your A2A automation is live.

Supported tools

8 A2A tools available in Sim

Send Message

Send a message to an external A2A-compatible agent.

Get Task

Query the status of an existing A2A task.

Cancel Task

Cancel a running A2A task.

Get Agent Card

Fetch the Agent Card (discovery document) for an A2A agent.

Resubscribe

Reconnect to an ongoing A2A task stream after connection interruption.

Set Push Notification

Configure a webhook to receive task update notifications.

Get Push Notification

Get the push notification webhook configuration for a task.

Delete Push Notification

Delete the push notification webhook configuration for a task.

Frequently asked questions

Sim's A2A integration lets you build AI agents that automate tasks in A2A without writing code. Interact with external A2A-compatible agents You can connect A2A to hundreds of other services in the same agent — from CRMs and spreadsheets to messaging tools and databases.

Start automating A2A today

Build your first AI agent with A2A in minutes. Connect to every tool your team uses. Free to start — no credit card required.

A2A

Overview

How to automate A2A with Sim

Create a free account

Add a A2A block

Configure, connect, and run

Supported tools

Frequently asked questions

Start automating A2A today