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. Le Chat reaches all of it through one connection. This page covers one slice of that: what Le Chat can actually do on TikTok, and what TikTok will not let it do.
Connect Hermoso to Le Chat
- Copy the connector URL.
https://app.hermoso.ai/mcp - Le Chat → Context → Connectors → Add connector → Add a custom connector. Name it Hermoso, paste the URL as the Server and leave Authentication on Auto-detect.
- Press Connect and approve. Le Chat detects Hermoso’s OAuth sign-in with dynamic client registration and opens the consent page. Sign in with your Hermoso account; there is no key to paste.
- Ask Le Chat 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.
Adding a custom connector is an admin action in Le Chat. On the Free, Pro and Student plans the account owner is the admin, so you can add Hermoso yourself, free plan included; on a team plan an admin adds it. The steps are quoted from Mistral’s MCP connector documentation, read on 2026-09-23. Hermoso is not affiliated with or endorsed by Mistral AI.
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 Le Chat gets
post_to_tiktok: publishes a finished video, or a photo post of up to 35 images, live on the profile at the privacy you choose, or into your TikTok drafts to finish in the app. 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, with the privacy fixed when you queue it.tiktok_account / tiktok_creator_info: the account’s bio, verification, follower and video counts, and the privacy levels the account itself allows.tiktok_post_status: follows a post TikTok is still processing, so a slow upload is checked rather than posted twice.list_tiktok_videos / tiktok_account_insights: recent posts with views, likes, comments and shares, and the account’s own analytics, with follower demographics on a Business account of 100 or more followers.list_tiktok_comments / reply_to_tiktok_comment / moderate_tiktok_comment: reads the comments on your posts, replies as the account, and likes, hides or deletes, once the TikTok account authorization is connected.search_tiktok: keyword search across public TikTok, which is 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 a draft carries no cover frame: on a direct post Hermoso sets the video’s best frame as the cover, while for a draft you pick the cover in the TikTok app.
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, so an overlong post is refused while you are still there to fix it instead of being silently cut on the way out. |
|---|---|
| Visibility | Everyone, followers, friends, only you, or a draft, and you choose. Hermoso passed TikTok’s Direct Post audit in August 2026, so a post can go live on the profile. TikTok’s rule is that the creator picks the privacy for every post, with nothing pre-selected, and only from the levels tiktok_creator_info says the account allows, so Hermoso asks instead of defaulting and refuses a post that names none before anything uploads. A draft goes to the TikTok inbox for you to finish in the app, which is also where you add a TikTok sound. There is no unlisted. Branded content cannot be combined with a private (only you) post, and that combination is refused rather than resolved for you. |
| 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 Le Chat
Ask for it in ordinary language. These are plain sentences, not a DSL:
“Make a 15-second UGC-style TikTok for our serum using the hook that repeats in our category, and post it publicly once I approve the caption.”
That walks search_tiktok → plan_ad → render_ad → post_to_tiktok. Le Chat lets you set each connector function to Always allow or leave it asking. Mistral’s own advice is to pre-authorise read functions and keep write functions on manual approval, and that is the right split here: research and list tools can run freely, anything that publishes, schedules or deletes should ask.
Le Chat on TikTok: the part that bites
The whole route works on Le Chat’s free plan: adding a custom connector is an admin action, and on Free, Pro and Student the account owner is the admin. Keep post_to_tiktok on manual approval in Le Chat’s per-function settings. TikTok wants the privacy chosen for each post, and a pre-authorised function would skip the moment you choose it.
Le Chat’s custom connectors do not pick up new tools after you connect; the list is what it loaded at that moment. Hermoso starts a connector on a short list and includes find_tools and call_tool, which reach every other tool by name, so a tool missing from the loaded list is still one request away.
Research TikTok before you post
Hermoso has no TikTok ad-library search of the kind it runs on Meta, 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
TikTok Ads is one of the twelve paid platforms Hermoso builds and reads campaigns on, including Smart+ campaigns and Spark Ads that promote an organic post, and it is a separate connection from the organic one. Campaigns run on TikTok’s Marketing API and posting runs on its content-posting approval, so Hermoso reports each one on its own rather than letting one imply the other. Only a confirm-gated status switch arms real money.
What Le Chat 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 Le Chat, post to: Facebook · Instagram · Threads · YouTube · X · LinkedIn · Pinterest · Bluesky · Telegram. Or see everything Le Chat can publish to.
Post to TikTok from: Claude · ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Perplexity · Claude Cowork · Perplexity Computer · Paperclip
Frequently asked questions
Can Le Chat post to TikTok?
Yes, through Hermoso's MCP server. In Le Chat, add https://app.hermoso.ai/mcp as a custom connector and approve it with your Hermoso account. There is no key to paste. Le Chat then has 922+ tools, including the ones that publish to TikTok, plus 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 Le Chat?
Two steps, once each. In Le Chat, 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 Le Chat publishes to TikTok as an ordinary tool call.
Can Le Chat post privately or as a draft to TikTok?
Yes. A TikTok post can go out to everyone, to followers, to friends or to only you, or go to your drafts instead. TikTok wants the creator to pick the privacy for each post, from the levels the account allows, so Hermoso asks rather than choosing for you. Hermoso refuses a visibility TikTok cannot honour at the moment you ask for it, rather than quietly publishing something weaker.
Can Le Chat run TikTok ads as well as posting?
Yes. TikTok Ads is one of the twelve paid platforms Hermoso manages, and it connects separately from organic TikTok publishing. Each half runs on its own TikTok approval, and Hermoso reports each one on its own instead of inferring one from the other.
What is the TikTok caption limit when posting from Le Chat?
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 Le Chat is told immediately rather than failing later when nobody is watching.
Can Le Chat research TikTok before it posts?
Yes, organically: Hermoso has no TikTok ad-library 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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