Send LinkedIn Message
Send a LinkedIn message to an existing conversation using its chat_id, or start a brand new conversation using the recipient's provider_id. Supports text up to 8000 characters, file and image attachments, and native voice notes up to 5MB that render as a playable waveform in the recipient's inbox. A built-in safety limit of 150 per day protects your account, and you can attribute the action to a campaign. Fails if neither chat_id nor provider_id is supplied.
Example prompt: Reply to chat msg_abc123 and let Jane know I'll send the deck over by end of day
{
"chat_id": "msg_abc123",
"message_id": "m_1042",
"sent": true
}What you can build
Parameters
Inputs accepted by send_message.
| Name | Type | Description |
|---|---|---|
| chat_id | string | The chat/conversation ID to send the message to. Get from list_conversations output. |
| provider_id | string | LinkedIn provider_id of the recipient. Provide this OR chat_id to start a new conversation. |
| text | string | The message text to send (max 8000 chars). Optional when voice_note_url is provided. |
| voice_note_url | string | Public URL of an audio file to send as a native LinkedIn voice note (.m4a, .mp3, .ogg, .wav, max 5MB). When provided, text is optional. The audio renders as a playable waveform in the recipient's inbox, not a file download. |
| attachments | object[] | Images or files to attach (max 10MB each; .mp4 video files are capped at 5MB) |
| campaign_id | string | Campaign slug (from list_campaigns) to track this action under. |
Related tools
Get LinkedIn Messages
Retrieve the full message history of any LinkedIn conversation by chat_id, with pagination, so your AI agent has the context to reply well.
List LinkedIn Conversations
List LinkedIn conversations with last message previews, label filters, and whose-turn flags so your AI agent can prioritize replies fast.
Send Voice Message
Send a LinkedIn voice note from a public audio URL (mp3, m4a, ogg, wav, up to 5 MB) to stand out in the inbox with a personal, human touch.
Schedule LinkedIn Message
Schedule a LinkedIn message to send at a future time, up to 8000 characters. Auto-cancels if the contact replies first so you never message redundantly.
The complete LinkedIn API. Ready when you are.
Connect your first LinkedIn profile in under 5 minutes. Every tool, every seat, no feature gates. Safe limits, warm-up, and full permission control built in.