Hermoso is a marketing MCP server: 301 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 is about one slice of that — what ChatGPT can actually do on TikTok, and what TikTok will not let it do.
Connect Hermoso to ChatGPT
- Copy the connector URL.
https://app.hermoso.ai/mcp - ChatGPT → Settings → Connectors → Add connector. Name it Hermoso and paste the URL. Connectors may need developer mode switched on once, under Settings → Connectors → Advanced.
- Connect and approve. Sign in with your Hermoso account when the consent page opens — 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.
If the connector option is not visible, that is the developer-mode toggle rather than anything on our side; Hermoso’s endpoint is the same streamable-HTTP URL every other client uses.
Then connect TikTok 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 TikTok tools ChatGPT gets
post_to_tiktok— uploads a finished video, or a photo post of up to 35 images, either straight to the profile or into your TikTok drafts. It also carries the interaction settings — comments, duet, stitch — the cover frame, and the branded-content disclosure.schedule_post— queues it for later on the shared calendar.tiktok_account / tiktok_creator_info— the account’s bio, verification, follower and video counts, and what privacy levels the account itself allows.list_tiktok_videos— recent posts with views, likes, comments and shares.search_tiktok— keyword search across public TikTok — the research half.
Two more operational facts. TikTok photo posts are pulled from a URL rather than uploaded, so the host serving the images has to be verified in TikTok’s developer portal before photo posts can go out at all. And there are no TikTok comment or moderation tools here — publishing and reading are covered, replying is not.
TikTok limits worth knowing before you automate anything
| Text | A TikTok video caption is capped at 2,200 characters, a photo-post caption at 4,000, and a photo title at 90. It is enforced when the post is created or queued — refused while you are still there to fix it, rather than silently cut on the way out. |
|---|---|
| Visibility | This is the one to read before you plan anything. TikTok’s content-sharing guidelines restrict an unaudited app to self-only posts, TikTok enforces it at post time, and Hermoso refuses up front rather than failing hours later: “until the app passes TikTok’s review, their content-sharing guidelines restrict it to SELF_ONLY (private-to-you) posts. Two things that DO work right now: post with privacy SELF_ONLY, or send it to TikTok drafts (destination 'draft') and publish it yourself in the app.” Hermoso has not passed TikTok’s review yet, so that is today’s behaviour — and the scheduler removes public from TikTok’s options at enqueue rather than accepting a schedule that is guaranteed to fail. |
| Carousel | Up to 35 images as a TikTok photo post, images only. That number is TikTok’s: “An array containing up to 35 photo content URLs.” The order is the slideshow, so slide order is the product. One image is simply a one-slide post, not a refusal. |
| Which account | None — TikTok publishes to the connected account. |
Try it in ChatGPT
Ask for it in ordinary language — these are sentences, not a DSL:
“Find what is working on TikTok for cold-brew brands, make me a 20-second video in that style with captions burned in, and put it in my TikTok drafts.”
That walks search_tiktok → plan_ad → render_ad → post_to_tiktok. Tool calls run in the chat and you approve them there, so nothing publishes without you seeing the caption first.
ChatGPT on TikTok: the part that bites
Ask for drafts, and the whole thing lands ready: the video, the caption, the cover frame and the interaction settings all arrive in TikTok and you press publish. The alternative Hermoso offers is a self-only post, which is genuinely private to you. Anything else is refused before an upload happens, because TikTok restricts unaudited apps to self-only and would reject it anyway.
ChatGPT is the only client that renders Hermoso’s inline widgets; anywhere else the same tools return plain structured results.
Research TikTok before you post
There is no TikTok ad library to search the way Meta’s can be searched, so TikTok research is organic: search_tiktok finds what is working by keyword, and analyze_video will pull a clip apart into its hook, beats and on-screen text so the pattern can be reused rather than guessed at.
The paid half
Hermoso does not manage TikTok ad campaigns, and says so rather than implying it. TikTok Ads is a separate connector that has not been built. What Hermoso does on TikTok is organic: make the video, post or draft it, read the account back.
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 — and 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 · YouTube · X · LinkedIn · Pinterest — or see everything ChatGPT can publish to.
Post to TikTok from: Claude · Claude Code · Cursor · Codex · Cline · OpenClaw · Hermes
Frequently asked questions
Can ChatGPT post to TikTok?
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 301 tools, including the ones that publish to TikTok — and the ones that research the ads already running in your market and render the creative in the first place.
How do I connect TikTok 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 TikTok inside Hermoso under Settings → Connectors, which is an OAuth consent screen in a browser. After that ChatGPT publishes to TikTok as an ordinary tool call.
What is the TikTok caption limit when posting from ChatGPT?
A TikTok video caption can run to 2,200 characters and a photo-post caption to 4,000. Hermoso enforces it when the post is created or queued, so ChatGPT is told immediately rather than failing later when nobody is watching.
Can ChatGPT research TikTok before it posts?
Yes, but organically — there is no TikTok ad library to search. search_tiktok finds what is working by keyword, and analyze_video breaks a clip into its hook, beats and on-screen text.
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