Hermoso is a marketing MCP server: 922+ tools over one OAuth’d endpoint that let an agent research the ads already running in a market, generate finished image and video ads, publish them, and build the paid campaigns behind them. ChatGPT reaches all of it through one connection. This page covers one slice of that: what ChatGPT can actually do on LinkedIn, and what LinkedIn will not let it do.
Connect Hermoso to ChatGPT
- Open Hermoso in ChatGPT’s app directory. Hermoso in the ChatGPT app directory, or search for Hermoso under Plugins in the ChatGPT sidebar.
- Add it, connect and approve. Click Add, then sign in with your Hermoso account when the consent page opens. There is no key to paste.
- Ask ChatGPT for something. “Pull my three closest competitors’ longest-running ads and remix the best hook into a 9:16 video,” or “post this render to the channel.” The agent picks the tools; you approve the spend.
Prefer to add it by hand? Developer mode still works: Plugins → Add → Create MCP App, Server URL https://app.hermoso.ai/mcp, Authentication OAuth. It is the same endpoint every other client uses.
Then connect LinkedIn itself, once, under Settings → Connectors in Hermoso. That is an OAuth consent screen, so it is the one step that needs a browser. Everything after it is a tool call.
The LinkedIn tools ChatGPT gets
post_to_linkedin_page: publishes text, an image, a video or a multi-image post to a company Page, with alt text.post_to_linkedin: publishes to a personal profile, which stays switched off until you explicitly share that identity.list_linkedin_pages: the Pages you have shared with this brand, with their organization ids.schedule_post: queues it, carryinglinkedinOrganizationIdso the right identity posts.manage_linkedin_post: edit the copy of a post, or delete it.linkedin_page_analytics: organic Page performance: follower gains, Page views, and post impressions, clicks and engagement, per Page or per post.search_linkedin_ads: the LinkedIn Ad Library, the one public ad library that exposes real impression counts.
LinkedIn is the channel where identity is a permission rather than a preference. One person usually administers several companies’ Pages, so Hermoso makes the postable identities an explicit choice: only the Pages you have ticked under Manage accounts can be posted to, an unticked Page is refused server-side rather than in the UI alone, and the personal profile is off unless you turn it on. An agent that asks which Page rather than assuming is doing the right thing.
LinkedIn limits worth knowing before you automate anything
| Text | A LinkedIn post is capped at 3,000 characters. It is enforced when the post is created or queued, so an overlong post is refused while you are still there to fix it instead of being silently cut on the way out. |
|---|---|
| Visibility | Public only. A LinkedIn post publishes to the profile or the company Page, and “LinkedIn has no unlisted, private or draft post.” |
| Carousel | 2 to 20 images, from a company Page. Both bounds are LinkedIn’s own: “A MultiImage post is a post containing multiple images (minimum of 2 images and maximum of 20 images)”, and the schema adds “Only supports images”. Two refusals follow from that and both are by name rather than by silent downgrade: a video slide is refused because LinkedIn’s multi-image post cannot carry one, and a personal-profile carousel is refused with the way forward: pass linkedinOrganizationId (from list_linkedin_pages), because “a personal-profile carousel is not something Hermoso can publish.” |
| Which account | linkedinOrganizationId. Unset means the member’s own profile, never “probably the company”. The field is how you say which Page, and leaving it out is a decision rather than an accident. |
Try it in ChatGPT
Ask for it in ordinary language. These are plain sentences, not a DSL:
“Show me which LinkedIn Pages I have shared, then write a founder-voice post about the new release and publish it to the company Page with an 8-image carousel.”
That walks list_linkedin_pages → plan_ad → render_ad → post_to_linkedin_page → linkedin_page_analytics. Tool calls run in the chat and you approve them there, so nothing publishes without you seeing the caption first.
ChatGPT on LinkedIn: the part that bites
The identity model is the thing to internalise: an unticked Page is refused by the server, not just hidden in a UI, and the personal profile is off until you turn it on. That also decides what you can publish: a LinkedIn carousel is a multi-image post and multi-image posts come from company Pages, so a personal-profile carousel is refused by name with the fix attached.
ChatGPT is the only client that renders Hermoso’s inline widgets; anywhere else the same tools return plain structured results.
Research LinkedIn before you post
search_linkedin_ads reads the LinkedIn Ad Library, which is unusual among public ad libraries in exposing real impression counts, so B2B competitor research on LinkedIn can be ranked by actual delivery rather than by guesswork about what is running.
The paid half
create_linkedin_ads_campaign_group → create_linkedin_ads_campaign → create_linkedin_ads_creative builds the tree, and everything is born as a draft. set_linkedin_ads_status is the only switch that arms real money and it refuses without an explicit confirmation. One access note that is better said than discovered: LinkedIn meters ad writes by the API tier your own ad account holds. Reporting and reads are unrestricted, and on the development tier an app may edit a small number of ad accounts, each registered by hand.
What ChatGPT cannot do on its own
An agent with a budget is only useful if the blast radius is bounded, so the fence is in the server rather than in a prompt. Every ad campaign, ad set, ad group and ad is created paused, and the status switches that arm real money refuse to run without an explicit confirmation flag. Every render is quoted first (hermoso_capabilities publishes each model’s exact credit cost before anything spends). Credits are reserved before the first provider call and settled at the exact cost afterwards, so a failed dispatch refunds rather than leaving you billed for nothing. Deletes are confirm-gated too, and every campaign tree is read back from the ad platform before your agent tells you what it built.
One step is deliberately not headless: linking an account is an OAuth consent screen, so you connect the channel once in a browser. Everything after that is a tool call.
The rest of the matrix
From ChatGPT, post to: Facebook · Instagram · Threads · TikTok · YouTube · X · Pinterest · Bluesky · Telegram. Or see everything ChatGPT can publish to.
Post to LinkedIn from: Claude · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Perplexity · Le Chat · Claude Cowork · Perplexity Computer · Paperclip
Frequently asked questions
Can ChatGPT post to LinkedIn?
Yes, through Hermoso's MCP server. In ChatGPT, add https://app.hermoso.ai/mcp as a custom connector and approve it with your Hermoso account. There is no key to paste. ChatGPT then has 922+ tools, including the ones that publish to LinkedIn, plus the ones that research the ads already running in your market and render the creative in the first place.
How do I connect LinkedIn to ChatGPT?
Two steps, once each. In ChatGPT, add https://app.hermoso.ai/mcp as a custom connector and approve it with your Hermoso account. There is no key to paste. Then connect LinkedIn inside Hermoso under Settings → Connectors, which is an OAuth consent screen in a browser. After that ChatGPT publishes to LinkedIn as an ordinary tool call.
Does ChatGPT need my LinkedIn password?
No. You connect LinkedIn to Hermoso once through an OAuth consent screen in a browser, and ChatGPT then reaches it as a tool call. Linking an account is the one step that is not headless; nothing after it needs a password, and no credential is ever handed to the model.
Can ChatGPT run LinkedIn ads as well as posting?
Yes. The LinkedIn Ads tree is buildable (campaign group, campaign, creative), and everything is born as a draft, with the status switch confirm-gated. LinkedIn meters ad writes by the API tier your own ad account holds.
Can ChatGPT post a carousel to LinkedIn?
Yes: 2 to 20 images, from a company Page, images only. Those are LinkedIn’s own published bounds; a personal-profile carousel is refused by name with the fix attached rather than posting slide one. ChatGPT calls the same publish tool either way, and a channel that cannot carry a carousel is refused with the real reason attached.
Can ChatGPT research LinkedIn before it posts?
Yes, and unusually well: search_linkedin_ads reads the LinkedIn Ad Library, which is the one public ad library that exposes real impression counts.
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