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`comment_on_post`

Comment on one post, or answer one comment on it.

This action can change or spend something, and when it does it happens right away. Read “Good to know” first.

What you give it

Input	What it is	Where to get it
`postUrl` needed	A post link or a post social id. The LinkedIn post URL.	On LinkedIn, click the More icon (the three dots) at the top right of the post, then "Copy link to post". Or run `search_posts` and use `posts[].url` from its answer. 9 more places to get it `search_posts` → `posts[].socialId` `search_linkedin_posts` → `results[].shareUrl` `get_recent_posts` → `posts[].url` `search_linkedin_posts` → `results[].socialId` `get_profile` → `recentPosts[].url` `get_post` → `shareUrl` `list_posts_by_author` → `posts[].shareUrl` `get_post` → `socialId` `list_posts_by_author` → `posts[].socialId`
`text` needed	Text, up to 1250 characters. The comment text.	You write it.
`replyToCommentId` optional	A comment id. Id of a comment on that post to reply to (from list_post_comments).	Run `list_post_comments` and use `comments[].id` from its answer. 2 more places to get it `list_comments_by_person` → `comments[].id` `comment_on_post` → `commentId`
`mentions` optional	A list (a group of fields), up to 20. People or companies to mention. Put {{0}}, {{1}}, … in the text where each one goes (its position in this list). What goes inside `name` (needed): text. The name as it should appear in the text. `profileId` (needed): a member id or a company id. The LinkedIn member id of the person (starts with ACo or ADo), or the numeric id of a company. Run `get_profile_details` and use `providerId` from its answer. 25 more places to get it `search_linkedin_companies` → `results[].id` `get_my_profile` → `accounts[].providerId` `list_sent_invitations` → `pendingInvitations[].providerId` `list_chats` → `chats[].attendeeProviderId` `list_messages` → `messages[].senderId` `list_chat_attendees` → `attendees[].providerId` `search_people` → `people[].providerId` `search_posts` → `posts[].author.providerId` `search_linkedin_people` → `results[].id` `search_linkedin_sales_navigator_companies` → `results[].id` `get_conversation` → `participant.providerId` `get_chat` → `attendeeProviderId` `list_chat_messages` → `messages[].senderId` `list_chat_participants` → `participants[].providerId` `get_message` → `senderId` `get_chat_attendee` → `providerId` `list_attendee_chats` → `chats[].attendeeProviderId` `list_attendee_messages` → `messages[].senderId` `get_post_engagers` → `reactors[].providerId` `get_post_engagers` → `commenters[].providerId` `list_post_reactions` → `reactions[].author.id` `get_profile_details` → `workExperience[].companyId` `get_company` → `id` `search_companies` → `companies[].companyId` `list_funding_signals` → `companies[].companyId` `isCompany` (optional): true or false. True when the mention is a company.	You write it.
`link` optional	A link. A link to show as a preview card. It should also appear in the text; otherwise LinkedIn adds it at the end.	You write it.
`imageUrl` optional	A link. One image to attach (a public https link, up to 10 MB).	You write it.
`asOrganization` optional	A organization id. Act as a company page you administer instead of yourself: that page's numeric id. No action here lists the pages you administer.	No action here gives it.
`connectionId` optional	A connection id. Which of your LinkedIn accounts to act from (its id from list_linkedin_accounts). Omit to use your first live one.	Run `list_linkedin_accounts` and use `accounts[].id` from its answer. 15 more places to get it `get_my_profile` → `accounts[].connectionId` `list_connections` → `connections[].connectionId` `list_connections` → `summary.accounts[].connectionId` `list_sent_invitations` → `pendingInvitations[].connectionId` `preview_withdraw_invitations` → `breakdown[].linkedinConnectionId` `list_conversations` → `inbox[].linkedinConnectionId` `list_inmail` → `inmail[].connectionId` `get_inmail_credits` → `accounts[].connectionId` `list_sales_navigator_contracts` → `accounts[].connectionId` `who_is_waiting_on_me` → `waitingOnYou[].connectionId` `who_went_cold` → `coldConversations[].connectionId` `connections_never_messaged` → `summary.accounts[].connectionId` `get_usage` → `connectionId` `get_conversation` → `connectionId` `get_inmail_conversation` → `connectionId`

Call it

curl -X POST https://api.heyreagent.com/v1/actions/comment_on_post \
  -H "Authorization: Bearer YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{"postUrl":"PASTE_POST_LINK_HERE","text":"Hello!"}'

The same call in JavaScript

const response = await fetch("https://api.heyreagent.com/v1/actions/comment_on_post", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_KEY",
    "content-type": "application/json",
  },
  body: JSON.stringify({
    "postUrl": "PASTE_POST_LINK_HERE",
    "text": "Hello!"
  }),
});
const answer = await response.json();
console.log(answer);

The same call in Python

import requests

response = requests.post(
    "https://api.heyreagent.com/v1/actions/comment_on_post",
    headers={"Authorization": "Bearer YOUR_KEY"},
    json={
        "postUrl": "PASTE_POST_LINK_HERE",
        "text": "Hello!",
    },
)
print(response.json())

The same call in n8n

Add an HTTP Request node and fill it in like this:

Method	`POST`
URL	`https://api.heyreagent.com/v1/actions/comment_on_post`
Send Headers	On. Name `Authorization`, Value `Bearer YOUR_KEY`
Send Body	On. Body Content Type `JSON`, Specify Body `Using JSON`, then paste the body below

{
  "postUrl": "PASTE_POST_LINK_HERE",
  "text": "Hello!"
}

Put your own key where it says YOUR_KEY. Put your own value where it says PASTE_…_HERE: the table above says where each one comes from. New here? Start with your first call.

What you get back

When it worked, the answer is { "ok": true, "result": { … } }. Inside result:

`sent`
`postUrl`
`asReply`
`commentId`	A comment id. Other actions take it.
`from`	the account it ran on
`usedToday`	number
`dailyLimit`	number

A field that does not apply to an answer is left out, or is null.

When it did not work, the answer is { "ok": false, "error": "…", "message": "…" }. What each error means.

Good to know

postUrl takes the post's link or its socialId; the action resolves a link to the socialId itself. A bare post id is refused.

In Claude or ChatGPT

Once connected, ask in your own words. The assistant sees this action as a tool with the same name, comment_on_post, and the same inputs.