How to post to LinkedIn from ChatGPT
ChatGPT drafts the LinkedIn post in the tone you have taught it, then creates it on the right connection, profile or company page.
How do I post to LinkedIn from ChatGPT?
Add the planpo.st MCP server to ChatGPT, connect LinkedIn once in the dashboard, then ask. The first three steps are one-time.
- 1
Create an API key and add planpo.st to ChatGPT
Make a scoped key in planpo.st under Settings. Open Settings, then Connectors, then Create, and enter the MCP URL with a custom Authorization header. ChatGPT connects to remote servers only, so the hosted endpoint is the one route. Whether you see Connectors depends on your plan and on developer mode.
- 2
Confirm the server is connected
Enable the connector in a new chat and ask it to list your connections.
- 3
Connect LinkedIn
Connect LinkedIn in the dashboard under Connections. A personal profile and a company page are separate connections with separate IDs, and get_connection_link gives the agent a URL to pass to you when one is missing.
- 4
Know what the post needs
A LinkedIn post needs text of 3,000 characters or fewer. Media is optional and nothing in platformSettings is required.
- 5
Ask in a ChatGPT conversation
Say what to post and when. ChatGPT finds the LinkedIn connection, creates the post, and tells you whether it was scheduled or kept as a draft, with the reason.
Settings -> Connectors -> Create
Name: PlanPost
MCP URL: https://mcp.planpo.st/mcp
Auth: Custom header
Header: Authorization
Value: Bearer pk_live_xxxReplace pk_live_xxx with your own key.
Which transport does ChatGPT use?
For ChatGPT there is one way in, the hosted endpoint as a custom connector. Nothing runs on your machine. The key travels in a header on every request and the endpoint keeps no session between them.
- There is no local option here. ChatGPT connects to remote MCP servers only, so use the hosted endpoint.
- Connector support has moved around between ChatGPT plans. If you cannot see the option, check OpenAI's current documentation rather than assuming the endpoint is at fault.
The full walkthrough is on the ChatGPT setup page.
What can ChatGPT do on LinkedIn?
It can publish text posts, single-image posts, multi-image posts of up to 9 images and video posts, to a personal profile or a company page. It cannot post PDF documents, polls or articles.
Text post
3,000Up to 3,000 characters with clickable links. The long cut of an idea belongs here, with platformContent.linkedin holding it when other networks get a shorter one.
Image or images
1 to 9One image, or several as a multi-image post. The first 9 are used.
Video
One video per post. When the first attachment is a video, that file is the post.
Profile or page
Decided by the connection ID. Pass the profile's ID, the page's ID, or both in two posts with different wording.
Attachments are optional on LinkedIn. When a post should carry one, that is the one awkward part of this pairing. ChatGPT connects to the hosted endpoint only and cannot PUT a file from your machine to an upload URL. Two routes work: upload the file in the planpo.st dashboard and let ChatGPT pick it with list_media, or ask for a carousel rendered from text with render_carousel.
Which settings does a LinkedIn post take?
The LinkedIn publisher reads nothing from platformSettings. Who the post is from is decided by the connection, and visibility is always public, so the table lists the post fields that do the work.
| Field | Allowed values | If you leave it out | Worth knowing |
|---|---|---|---|
| connectionIds | ID of a profile connection or a company page connection | None, required | This is the profile versus page switch. list_connections returns both with their IDs. |
| platformContent.linkedin | Text, 3,000 characters or fewer | The shared content | Over 3,000 here is rejected with a 400. Shared content over 3,000 saves the post as a draft with char_limit. |
| media, platformMedia.linkedin | Images (1 to 9) or one video | Text post | The first attachment decides the kind of post. Images after the ninth are left out. |
| platformSettings.linkedin.* | Not read | Does not apply | organizationUrn and isPersonal exist on the type and are ignored at publish. Use the connection ID. |
| Visibility | PUBLIC | PUBLIC | Fixed. There is no connections-only option. |
What do I type to post to LinkedIn from ChatGPT?
Plain requests work. Each example lists the tool calls ChatGPT makes in response.
1. Profile and company page, two voices
You say
Use the copy we just worked out above. Write two LinkedIn posts from it: first person for my profile, third person for the company page. Schedule both for Thursday 09:00.
Tool calls
list_connections()
create_post({ content: "<first person>", connectionIds: ["<profile id>"], schedule: "thursday 09:00" })
create_post({ content: "<third person>", connectionIds: ["<page id>"], schedule: "thursday 09:00" })Two scheduled posts on two connections. They are separate posts on purpose, because the wording differs and so will the numbers.
2. A carousel of images
You say
Take the announcement I pasted. Make a 7-slide carousel from it for LinkedIn and save the post as a draft so I can look first.
Tool calls
generate_carousel({ content: "<source text>", platform: "linkedin", maxSlides: 7 })
render_carousel({ slides: [...], family: "<id from list_carousel_styles>" })
get_carousel_render({ id: "<render id>" })
create_post({ content: "<caption>", media: [<7 assets>], connectionIds: ["<linkedin id>"], schedule: "draft" })Seven rendered PNG slides in your media library and a draft multi-image post. Seven fits; a tenth slide would be dropped, since LinkedIn gets the first 9 images.
3. Post with a tracked link
You say
Start from the bullet list in my last message. Write a LinkedIn post that ends with the link to the pricing page and schedule it at the best time this week.
Tool calls
get_best_times({ platform: "linkedin" })
create_post({ content: "<post ending in https://...>", connectionIds: ["<linkedin id>"], scheduledFor: "<ISO time from get_best_times>", campaign: "pricing-update" })A scheduled post with a clickable link and a campaign tag. Payments that follow a click on that link show up next to this post.
What stops a LinkedIn post from ChatGPT?
The tag on a card is the code that comes back in the tool result.
3,000 characters
char_limitChecked when the post is created. Too long and it is saved as a draft with the count, the limit and the field to shorten.
9 images, then it stops
A multi-image post uses the first 9 attachments. Extra images are left out without failing the post, so keep carousels at 9 or fewer.
Do not mix images and video
The first attachment decides the type. An image first makes it an image post; a video first makes it a video post with that one file.
No PDF documents
The swipeable document format is not supported. A rendered image carousel is the nearest thing and it publishes as a multi-image post.
Always public
Posts go out with public visibility. If you need connections-only, post that one by hand.
Profile and page are different connections
Sending a page announcement to your personal profile is one wrong ID away. Have the agent read list_connections back before the first post.
If Connectors is missing, it is the plan
ChatGPTCustom connector availability has moved between ChatGPT plans and settings. When the option is not there, check OpenAI's current documentation before assuming the endpoint is broken.
Can ChatGPT tell me what a LinkedIn post earned?
Yes. Links in LinkedIn posts are clickable, so a tracked link in the post gives a click to match against a later payment, and get_revenue_overview returns the totals and recent transactions. LinkedIn readers are mostly buying for a business, which usually means Stripe on the other end.
ChatGPT and LinkedIn: questions people ask
- Can ChatGPT upload an image from my machine for LinkedIn?
- Not directly. ChatGPT connects to the hosted endpoint only and cannot PUT a file from your machine to an upload URL. Upload the file in the dashboard and ChatGPT finds it with list_media, or have it render one: render_carousel makes branded images from text.
- How do I post to a company page instead of my profile?
- Pass the page's connection ID. The page and the profile are separate connections, and the post is authored by whichever one the ID belongs to. There is no setting for it.
- Can it post a document carousel?
- Not the PDF kind. It can render up to 9 slides as images and publish them as a multi-image post.
- What happens when ChatGPT sends a LinkedIn post that breaks a rule?
- It is told at once. The usual case on LinkedIn is text over 3,000 characters: the post is kept as a draft and the tool result carries char_limit plus the fix, which ChatGPT applies with update_post.
- Is there a local option for ChatGPT?
- No. ChatGPT talks to remote MCP servers, so it uses https://mcp.planpo.st/mcp with your API key in a header. The endpoint is stateless and every request carries the key. Posting to LinkedIn works the same as from any other client.
- Can I limit what ChatGPT is allowed to do?
- Yes, with the API key. Keys are scoped, so a key without posts:write can read your LinkedIn schedule and not change it, and a key set to require approval turns every post into a request you approve.
Keep going
LinkedIn from other agents
Other networks from ChatGPT