Send iMessage, SMS, and RCS messages and manage conversations with Linq
Linq is a Sim integration in the Communication category. Sim is the AI workspace where teams build and deploy AI agents. Sim's Linq integration provides 34 tools and 6 triggers that AI agents can use inside Sim's visual workflow builder. Linq connects with an API key. Free to start at sim.ai.
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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.
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Open your workspace, drag a Linq block onto the workflow builder, and paste in your Linq API key.
Pick the tool you need, wire in an AI agent for reasoning or data transformation, and run. Your Linq automation is live.
Add a Linq trigger to a Sim agent and it starts a run whenever one of these Linq events occurs.
Trigger workflow when an inbound message is received
Trigger workflow when a message is delivered
Trigger workflow when a message fails to deliver
Trigger workflow when a message is read
Trigger workflow when a reaction is added to a message
Trigger on any Linq webhook event (messages, reactions, chats, and more)
Ready-to-use templates featuring Linq. Click any to build it instantly.
34 Linq tools available to Sim agents.
Send a message to an existing chat, with optional media, link, effect, or reply
Start a new iMessage, SMS, or RCS chat and send the first message
List chats, optionally filtered by sender or participant handle
Retrieve a chat by ID, including participants and line health
Update chat properties such as group display name and icon
Mark messages in a chat as read (only applies to 1:1 iMessage/RCS; no effect on group chats)
Leave an iMessage group chat (4+ active participants; not supported for direct chats)
Add a participant to a group chat (3+ existing participants)
Remove a participant from a group chat (minimum 3 participants must remain)
Show a typing indicator in a one-on-one chat (iMessage only, not group chats)
Stop the typing indicator in a one-on-one chat (iMessage only, not group chats)
Send a voice memo to a chat from a URL or a pre-uploaded attachment
Share your configured contact card (Name and Photo Sharing) with a chat
List messages in a chat with pagination
List all messages in the thread that contains a given message
Retrieve a single message by ID, including parts, reactions, and delivery status
Edit the text of a sent message (up to 5 times, within 15 minutes of sending; iMessage only)
Delete a message from the Linq API only (does not unsend it; recipients still see it)
Add or remove a tapback reaction on a message
Upload a file to Linq as a reusable attachment (max 100MB) and get an attachment ID to send in messages
Retrieve metadata for an attachment, including its download URL and status
Permanently delete an attachment owned by your account
List all phone numbers assigned to your partner account, with line health
Check whether an address (phone number or email) supports iMessage
Check whether an address (phone number or email) supports RCS
Retrieve contact cards, optionally filtered by phone number
Set up a contact card (Name and Photo Sharing) for a phone number
Partially update an existing active contact card for a phone number
Subscribe an HTTPS endpoint to Linq webhook events
List all webhook subscriptions on your account
Retrieve a webhook subscription by ID
Update a webhook subscription (target URL, events, phone filter, or active state)
Delete a webhook subscription from your account
List all webhook event types available to subscribe to
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.
