Create LinkedIn post
curl --request POST \
--url https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'Team-SID: <api-key>' \
--data '
{
"linkedin_account_sid": "<string>",
"text": "<string>",
"images": [
{
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>",
"alt_text": "<string>"
}
],
"video": {
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>"
},
"scheduled_at": "<string>",
"mentions": [
{
"profile_id": "<string>",
"start": 1,
"length": 2
}
],
"brand_partnership": true,
"author_organization_id": "<string>",
"group_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
'import requests
url = "https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post"
payload = {
"linkedin_account_sid": "<string>",
"text": "<string>",
"images": [
{
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>",
"alt_text": "<string>"
}
],
"video": {
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>"
},
"scheduled_at": "<string>",
"mentions": [
{
"profile_id": "<string>",
"start": 1,
"length": 2
}
],
"brand_partnership": True,
"author_organization_id": "<string>",
"group_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Team-SID": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
Authorization: 'Bearer <token>',
'Team-SID': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
linkedin_account_sid: '<string>',
text: '<string>',
images: [
{
file_base64: '<string>',
url: '<string>',
file_byte_size: 2,
file_name: '<string>',
file_type: '<string>',
alt_text: '<string>'
}
],
video: {
file_base64: '<string>',
url: '<string>',
file_byte_size: 2,
file_name: '<string>',
file_type: '<string>'
},
scheduled_at: '<string>',
mentions: [{profile_id: '<string>', start: 1, length: 2}],
brand_partnership: true,
author_organization_id: '<string>',
group_id: '<string>',
client_reference: '<string>',
confirmed_not_sent: '<string>',
confirmed_sent: '<string>'
})
};
fetch('https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'linkedin_account_sid' => '<string>',
'text' => '<string>',
'images' => [
[
'file_base64' => '<string>',
'url' => '<string>',
'file_byte_size' => 2,
'file_name' => '<string>',
'file_type' => '<string>',
'alt_text' => '<string>'
]
],
'video' => [
'file_base64' => '<string>',
'url' => '<string>',
'file_byte_size' => 2,
'file_name' => '<string>',
'file_type' => '<string>'
],
'scheduled_at' => '<string>',
'mentions' => [
[
'profile_id' => '<string>',
'start' => 1,
'length' => 2
]
],
'brand_partnership' => true,
'author_organization_id' => '<string>',
'group_id' => '<string>',
'client_reference' => '<string>',
'confirmed_not_sent' => '<string>',
'confirmed_sent' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"Team-SID: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post"
payload := strings.NewReader("{\n \"linkedin_account_sid\": \"<string>\",\n \"text\": \"<string>\",\n \"images\": [\n {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\",\n \"alt_text\": \"<string>\"\n }\n ],\n \"video\": {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\"\n },\n \"scheduled_at\": \"<string>\",\n \"mentions\": [\n {\n \"profile_id\": \"<string>\",\n \"start\": 1,\n \"length\": 2\n }\n ],\n \"brand_partnership\": true,\n \"author_organization_id\": \"<string>\",\n \"group_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Team-SID", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post")
.header("Authorization", "Bearer <token>")
.header("Team-SID", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"linkedin_account_sid\": \"<string>\",\n \"text\": \"<string>\",\n \"images\": [\n {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\",\n \"alt_text\": \"<string>\"\n }\n ],\n \"video\": {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\"\n },\n \"scheduled_at\": \"<string>\",\n \"mentions\": [\n {\n \"profile_id\": \"<string>\",\n \"start\": 1,\n \"length\": 2\n }\n ],\n \"brand_partnership\": true,\n \"author_organization_id\": \"<string>\",\n \"group_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Team-SID"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"linkedin_account_sid\": \"<string>\",\n \"text\": \"<string>\",\n \"images\": [\n {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\",\n \"alt_text\": \"<string>\"\n }\n ],\n \"video\": {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\"\n },\n \"scheduled_at\": \"<string>\",\n \"mentions\": [\n {\n \"profile_id\": \"<string>\",\n \"start\": 1,\n \"length\": 2\n }\n ],\n \"brand_partnership\": true,\n \"author_organization_id\": \"<string>\",\n \"group_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"operation": "action",
"action": "<string>",
"item": "<unknown>",
"result": {
"activity_urn": "<string>",
"post_urn": "<string>",
"url": "<string>",
"created_at": "<string>",
"text": "<string>",
"activity_log": {},
"idempotent_replay": true,
"content_differs": true
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
},
"pacing": {
"linkedin_account_sid": "<string>",
"limit_type": "<string>",
"next_call_after": "<string>",
"remaining_today": 1
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}linkedin_posting
Create LinkedIn post
Publish ONE feed post - as the member, AS a company page it administers (author_organization_id), or INTO a group (group_id) - now or scheduled (scheduled_at) - wire create-post. Public; retract with delete_linkedin_post, or delete a scheduled draft with delete_linkedin_scheduled_post. Identity-bound: linkedin_account_sid REQUIRED, spends the posting bucket (20/day in series of 3 at a 1200 s pause; free plan 4), saturation returns 429. text is REQUIRED as a key but may be an EMPTY string when media is attached; no text, images or video at all is a 422. Media: up to 20 images XOR one video, each base64 or an https url, 35 MB total. Answers the published post (urn, url, time, body) and the activity-log row. Sends once per client_reference and place (your feed, the page or the group; a new scheduled_at is the same post): a repeat is answered, never sent twice; on a 409 read error.context.send_outcome, never resend under a new key. 409 post_not_created is send_outcome unknown: repeat after retry_after.
Contract:
- MCP tool
create_linkedin_post, registry packagemcp.linkedin/linkedin_posting, mountlinkedin.content. - Operation
action, response envelopeaction. - Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API; paced: a call spends the
postingsmart-limit bucket of the account it runs on, and calls of one bucket are spaced per account. A short wait is slept by the server; a longer one answers 429rate_limitedwithcontext.retry_after, and the same call succeeds from that moment. Parallel calls on one account queue behind each other.
POST
/
api
/
linkedin-posting
/
create-post
Create LinkedIn post
curl --request POST \
--url https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'Team-SID: <api-key>' \
--data '
{
"linkedin_account_sid": "<string>",
"text": "<string>",
"images": [
{
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>",
"alt_text": "<string>"
}
],
"video": {
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>"
},
"scheduled_at": "<string>",
"mentions": [
{
"profile_id": "<string>",
"start": 1,
"length": 2
}
],
"brand_partnership": true,
"author_organization_id": "<string>",
"group_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
'import requests
url = "https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post"
payload = {
"linkedin_account_sid": "<string>",
"text": "<string>",
"images": [
{
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>",
"alt_text": "<string>"
}
],
"video": {
"file_base64": "<string>",
"url": "<string>",
"file_byte_size": 2,
"file_name": "<string>",
"file_type": "<string>"
},
"scheduled_at": "<string>",
"mentions": [
{
"profile_id": "<string>",
"start": 1,
"length": 2
}
],
"brand_partnership": True,
"author_organization_id": "<string>",
"group_id": "<string>",
"client_reference": "<string>",
"confirmed_not_sent": "<string>",
"confirmed_sent": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Team-SID": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
Authorization: 'Bearer <token>',
'Team-SID': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
linkedin_account_sid: '<string>',
text: '<string>',
images: [
{
file_base64: '<string>',
url: '<string>',
file_byte_size: 2,
file_name: '<string>',
file_type: '<string>',
alt_text: '<string>'
}
],
video: {
file_base64: '<string>',
url: '<string>',
file_byte_size: 2,
file_name: '<string>',
file_type: '<string>'
},
scheduled_at: '<string>',
mentions: [{profile_id: '<string>', start: 1, length: 2}],
brand_partnership: true,
author_organization_id: '<string>',
group_id: '<string>',
client_reference: '<string>',
confirmed_not_sent: '<string>',
confirmed_sent: '<string>'
})
};
fetch('https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'linkedin_account_sid' => '<string>',
'text' => '<string>',
'images' => [
[
'file_base64' => '<string>',
'url' => '<string>',
'file_byte_size' => 2,
'file_name' => '<string>',
'file_type' => '<string>',
'alt_text' => '<string>'
]
],
'video' => [
'file_base64' => '<string>',
'url' => '<string>',
'file_byte_size' => 2,
'file_name' => '<string>',
'file_type' => '<string>'
],
'scheduled_at' => '<string>',
'mentions' => [
[
'profile_id' => '<string>',
'start' => 1,
'length' => 2
]
],
'brand_partnership' => true,
'author_organization_id' => '<string>',
'group_id' => '<string>',
'client_reference' => '<string>',
'confirmed_not_sent' => '<string>',
'confirmed_sent' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"Team-SID: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post"
payload := strings.NewReader("{\n \"linkedin_account_sid\": \"<string>\",\n \"text\": \"<string>\",\n \"images\": [\n {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\",\n \"alt_text\": \"<string>\"\n }\n ],\n \"video\": {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\"\n },\n \"scheduled_at\": \"<string>\",\n \"mentions\": [\n {\n \"profile_id\": \"<string>\",\n \"start\": 1,\n \"length\": 2\n }\n ],\n \"brand_partnership\": true,\n \"author_organization_id\": \"<string>\",\n \"group_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Team-SID", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post")
.header("Authorization", "Bearer <token>")
.header("Team-SID", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"linkedin_account_sid\": \"<string>\",\n \"text\": \"<string>\",\n \"images\": [\n {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\",\n \"alt_text\": \"<string>\"\n }\n ],\n \"video\": {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\"\n },\n \"scheduled_at\": \"<string>\",\n \"mentions\": [\n {\n \"profile_id\": \"<string>\",\n \"start\": 1,\n \"length\": 2\n }\n ],\n \"brand_partnership\": true,\n \"author_organization_id\": \"<string>\",\n \"group_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.gtm-api.com/linkedin/v4/api/linkedin-posting/create-post")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Team-SID"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"linkedin_account_sid\": \"<string>\",\n \"text\": \"<string>\",\n \"images\": [\n {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\",\n \"alt_text\": \"<string>\"\n }\n ],\n \"video\": {\n \"file_base64\": \"<string>\",\n \"url\": \"<string>\",\n \"file_byte_size\": 2,\n \"file_name\": \"<string>\",\n \"file_type\": \"<string>\"\n },\n \"scheduled_at\": \"<string>\",\n \"mentions\": [\n {\n \"profile_id\": \"<string>\",\n \"start\": 1,\n \"length\": 2\n }\n ],\n \"brand_partnership\": true,\n \"author_organization_id\": \"<string>\",\n \"group_id\": \"<string>\",\n \"client_reference\": \"<string>\",\n \"confirmed_not_sent\": \"<string>\",\n \"confirmed_sent\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"success": true,
"operation": "action",
"action": "<string>",
"item": "<unknown>",
"result": {
"activity_urn": "<string>",
"post_urn": "<string>",
"url": "<string>",
"created_at": "<string>",
"text": "<string>",
"activity_log": {},
"idempotent_replay": true,
"content_differs": true
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
},
"pacing": {
"linkedin_account_sid": "<string>",
"limit_type": "<string>",
"next_call_after": "<string>",
"remaining_today": 1
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}{
"success": false,
"error": {
"code": "validation_failed",
"message": "<string>",
"recoverable": true,
"suggestion": "<string>",
"field_errors": {},
"blockers": [
{
"type": "<string>",
"severity": "hard",
"description": "<string>",
"entity_sid": "<string>",
"resolution": "<string>",
"resolution_hint": "<string>",
"count": 123
}
],
"context": {}
},
"meta": {
"trace_id": "<string>",
"span_id": "<string>",
"timestamp": "<string>",
"duration_ms": 1,
"team_sid": "<string>",
"actor_type": "<string>"
}
}Authorizations
Access token issued by gtm.service.id. Its access_identity claim carries team_sid, actor_sid and actor_type, and that team scope is authoritative.
Team scope for tokens that do not carry one. Ignored when the token already names a team.
Body
application/json
Request body of create_linkedin_post.
LinkedIn account sid (ln_ac_…), the authoring account. Identity-bound: REQUIRED, posts publish AS this account.
Required string length:
18Pattern:
^ln_ac_Post body, always present. Empty is legal ONLY alongside an image. 3000 is LinkedIn's own cap, refused here rather than burning a posting slot. Published byte for byte, blank lines included, and so is each image's alt_text.
Maximum string length:
3000Up to 20 images (the node's own cap; array order = carousel order). Mutually exclusive with video. The decoded bytes across ALL media must stay under 35 MB in total; over that is a 422, because a bigger body is refused by the node's JSON parser as a bare 413 with no response envelope. For 2+ images the backend supplies the account's own member id to the wire itself - no profile_id field exists here. Uploads are sequential node-side, so many large images make a SLOW synchronous call: the post can publish after your client times out, so repeat it only as the same request under the same client_reference, which is answered with the post (or held while LinkedIn is read), never published twice.
Maximum array length:
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ANYONE (the node default) or CONNECTIONS_ONLY. Omit to let the node apply its own default. Mutually exclusive with group_id.
Available options:
ANYONE, CONNECTIONS_ONLY Who may comment: ALL (the node default), CONNECTIONS_ONLY, or NONE to disable comments. Works on group posts too.
Available options:
ALL, CONNECTIONS_ONLY, NONE ONE video, image-shaped minus alt_text. Mutually exclusive with images (LinkedIn does not mix them in a share - 422 here). Shares the 35 MB media budget. The upload is a single large PUT through the browser and is SLOW: the synchronous call can outlive your client timeout while the post still publishes, so repeat it only under the same client_reference.
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Schedule the post instead of publishing now: ISO 8601 with timezone, must be in the future (a strictly-past time is a 422; within a minute of now is passed through for LinkedIn to judge). A SCHEDULED share legitimately answers with null activity_urn/url - post_urn is the handle. Read and clean the queue with get_linkedin_scheduled_posts / delete_linkedin_scheduled_post. Scheduling is LinkedIn-side: the draft lives in ITS queue, nothing is stored here. The slot is no part of a key: a retry under the same client_reference that computes a new scheduled_at is the same post. Without a key the slot tells two posts apart.
Profile mentions as READY POSITIONS over text (2026-08-21) - unlike create_linkedin_comment's {profile_id, name} search pairs. Require non-blank text.
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true adds LinkedIn's "Brand partnership" label (paid endorsement). false and absent both send nothing - the wire's own shape.
Post AS a company page the account administers: the bare numeric company id (same form get_linkedin_company_posts takes). Omit to post as the member.
Pattern:
^\d+$Post INTO a group: the bare numeric group id. Mutually exclusive with visibility - a group post sets container visibility, not member-feed visibility. No read serves a group's feed, so a group post whose answer was lost stays in doubt until a person gives their word.
Pattern:
^\d+$Your key for this ONE post (max 255, byte for byte): one key per post, the same key on every repeat of it. The key and its place (where it lands: your own feed, the company page of author_organization_id or the group of group_id) are one post whatever it says, and a repeat never goes out twice: it answers 200 with what the first send made (result.idempotent_replay, result.content_differs when this request says something else) or 409 naming error.context.send_outcome (in_flight, unknown with retry_after and send_decisive_at, or sent; not_sent with blocking_activity_log_sid when another post in doubt holds the place). The same key at another place is another post. Without a key the same words and pictures or video at the same place and slot count as a repeat for an hour after they went out. check_linkedin_posting_sent asks by it.
Maximum string length:
255A person's word that an earlier attempt of THIS send is not on LinkedIn: its activity_log_sid (ln_al_...), from the 409 or check_linkedin_posting_sent, given only after someone looked on LinkedIn. Taken once the attempt can no longer land (before that: 409 send_outcome_unknown, waiting_for may_still_land, retry_after and send_decisive_at that moment): it settles that attempt not_sent and this request goes out. Moot when the attempt is no longer in doubt; another send's sid is 422 not_this_message.
Required string length:
18Pattern:
^ln_al_A person's word that an earlier attempt of THIS send IS on LinkedIn: its activity_log_sid, as for confirmed_not_sent (never both). Taken at once; it settles the attempt sent and sends nothing: the answer is 409 concurrent_send_in_flight with send_outcome sent while what it made is not known (LinkedIn is read for it), or 200 with it once a read has found it. Another send's sid is 422 not_this_message; an attempt already proved not sent is 409 confirmed_sent_contradicts.
Required string length:
18Pattern:
^ln_al_Response
action success envelope.
Available options:
true Available options:
action kebab-case verb; matches the route segment.
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