What can I automate with Linq in Sim?

You can send message, create chat, list chats, get chat, and update chat with Linq in Sim, plus 29 more Linq tools listed on this page. Each runs as a tool inside an AI agent, so the agent can combine Linq with any other connected service and apply LLM reasoning between steps.

How do I connect Linq to Sim?

(1) Create a free account at sim.ai. (2) Create an agent in your workspace. (3) Drag a Linq block onto the workflow builder. (4) Paste your Linq API key to authenticate. (5) Pick a tool such as "Send Message", wire up its inputs, and click Run.

How do I send message with Linq in Sim?

Add a Linq block to your agent and select "Send Message" as the tool. Send a message to an existing chat, with optional media, link, effect, or reply. Fill in the required fields. Inputs can reference outputs from earlier steps, such as text generated by an AI block or data fetched from another integration.

Can Linq events start a Sim agent automatically?

Yes. Sim supports 6 triggers for Linq: Linq Message Received, Linq Message Delivered, Linq Message Failed, Linq Message Read, Linq Reaction Added, and Linq Webhook (All Events). Add a Linq trigger to your agent, and every matching Linq event starts a run with the event data available to the rest of the workflow.

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Linq integration for AI agents

Send iMessage, SMS, and RCS messages and manage conversations with Linq

View docs

Last updated August 18, 2026

What Sim agents can do with Linq

Reach people on iMessage, SMS, and RCS through Linq. Start chats, send messages with media, links, effects, and replies, send voice memos, react with tapbacks, manage group participants, check iMessage/RCS capability, configure contact cards, and subscribe to webhook events — all through a single Linq API key.

Category: Communication
Authentication: API key
Tools: 34
Triggers: 6
Documentation: Linq docs

How to automate Linq with Sim

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

Linq triggers

Add a Linq trigger to a Sim agent and it starts a run whenever one of these Linq events occurs.

Linq Message Received

Trigger workflow when an inbound message is received

Linq Message Delivered

Trigger workflow when a message is delivered

Linq Message Failed

Trigger workflow when a message fails to deliver

Linq Message Read

Trigger workflow when a message is read

Linq Reaction Added

Trigger workflow when a reaction is added to a message

Linq Webhook (All Events)

Trigger on any Linq webhook event (messages, reactions, chats, and more)

Agent templates

Ready-to-use templates featuring Linq. Click any to build it instantly.

Linq tools

34 Linq tools available to Sim agents.

Send Message

Send a message to an existing chat, with optional media, link, effect, or reply

Create Chat

Start a new iMessage, SMS, or RCS chat and send the first message

List Chats

List chats, optionally filtered by sender or participant handle

Get Chat

Retrieve a chat by ID, including participants and line health

Update Chat

Update chat properties such as group display name and icon

Mark Chat as Read

Mark messages in a chat as read (only applies to 1:1 iMessage/RCS; no effect on group chats)

Leave Chat

Leave an iMessage group chat (4+ active participants; not supported for direct chats)

Add Participant

Add a participant to a group chat (3+ existing participants)

Remove Participant

Remove a participant from a group chat (minimum 3 participants must remain)

Start Typing

Show a typing indicator in a one-on-one chat (iMessage only, not group chats)

Stop Typing

Stop the typing indicator in a one-on-one chat (iMessage only, not group chats)

Send Voice Memo

Send a voice memo to a chat from a URL or a pre-uploaded attachment

Share Contact Card

Share your configured contact card (Name and Photo Sharing) with a chat

List Messages

List messages in a chat with pagination

List Thread

List all messages in the thread that contains a given message

Get Message

Retrieve a single message by ID, including parts, reactions, and delivery status

Edit Message

Edit the text of a sent message (up to 5 times, within 15 minutes of sending; iMessage only)

Delete Message

Delete a message from the Linq API only (does not unsend it; recipients still see it)

React to Message

Add or remove a tapback reaction on a message

Create Attachment

Upload a file to Linq as a reusable attachment (max 100MB) and get an attachment ID to send in messages

Get Attachment

Retrieve metadata for an attachment, including its download URL and status

Delete Attachment

Permanently delete an attachment owned by your account

List Phone Numbers

List all phone numbers assigned to your partner account, with line health

Check iMessage

Check whether an address (phone number or email) supports iMessage

Check RCS

Check whether an address (phone number or email) supports RCS

Get Contact Card

Retrieve contact cards, optionally filtered by phone number

Create Contact Card

Set up a contact card (Name and Photo Sharing) for a phone number

Update Contact Card

Partially update an existing active contact card for a phone number

Create Webhook Subscription

Subscribe an HTTPS endpoint to Linq webhook events

List Webhook Subscriptions

List all webhook subscriptions on your account

Get Webhook Subscription

Retrieve a webhook subscription by ID

Update Webhook Subscription

Update a webhook subscription (target URL, events, phone filter, or active state)

Delete Webhook Subscription

Delete a webhook subscription from your account

List Webhook Events

List all webhook event types available to subscribe to

Frequently asked questions

Sim's Linq integration adds 34 tools and 6 triggers to the AI agents you build in Sim's visual workflow builder. Send iMessage, SMS, and RCS messages and manage conversations with Linq.