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. Claude reaches all of it through one connection. This page covers one slice of that: what Claude can actually do on YouTube, and what YouTube will not let it do.
Connect Hermoso to Claude
- Copy the connector URL.
https://app.hermoso.ai/mcp - Claude → Customize → Connectors → ＋ Add → Add custom connector. Name it Hermoso and paste the URL.
- Connect and approve. Sign in with your Hermoso account on the consent page. There is no key to paste. The connector signs in with OAuth and mints its own.
- Ask Claude 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.
Claude and ChatGPT are the two clients where nothing is pasted: the hosted connector runs a full OAuth handshake with PKCE and dynamic client registration, and the key it mints is scoped to the profile you approved it against. That scope is pinned on the server and never read off the request.
Then connect YouTube 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 YouTube tools Claude gets
post_to_youtube: uploads a finished video with a title, a description of up to 5,000 characters, up to 30 tags, and a privacy setting.schedule_post: queues the upload, and carries the description and tags through with it.set_youtube_thumbnail: puts a designed thumbnail on the upload. It is the single biggest lever on click-through, and YouTube otherwise picks a frame more or less at random.make_thumbnail: generates that thumbnail in the first place.update_youtube_video / list_youtube_videos: edit an upload’s metadata, or list your own uploads, including unlisted and private ones a public search cannot see.youtube_video_insights / youtube_channel: views, watch time, average view percentage and subscribers gained.list_youtube_comments / reply_to_youtube_comment: read and answer comments as the channel.
The unit really is a video: post_to_youtube takes a videoUrl and there is no image path at all. Two smaller gates worth knowing before an automated upload: a Google project that has not been verified has videos.insert locked to private regardless of what you ask for, and custom thumbnails need a phone-verified channel.
YouTube limits worth knowing before you automate anything
| Text | A YouTube title is capped at 100 characters, and a scheduled item’s text becomes the title. The description is a separate field of up to 5,000 characters, carrying up to 30 tags. 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, unlisted or private. There is no Studio draft: “YouTube’s API can upload as public, unlisted or private, but it cannot create a Studio draft”, so unlisted is the closest thing to a review state, and it is what an immediate post defaults to so an ad-ready upload is not accidentally public. |
| Carousel | Refused, by name. “YouTube’s unit is a video, not a set of stills. Turn the slides into a video (Hermoso can stitch them) and post that instead, or drop YouTube from this post.” Hermoso did not invent that limit to avoid work; it is simply what YouTube is. The refusal comes at enqueue, with the way forward attached, instead of a silently posted first slide. |
| Which account | None. YouTube publishes to the connected channel. |
Try it in Claude
Ask for it in ordinary language. These are plain sentences, not a DSL:
“Turn this 40-second product film into a YouTube upload. Write the title under 100 characters, a real description with the link, ten tags, generate a thumbnail, and upload it unlisted.”
That walks make_thumbnail → post_to_youtube → set_youtube_thumbnail → youtube_video_insights. Every tool call happens inside the conversation, so you see the Page, the board or the caption before anything publishes, and you can stop it by saying so.
Claude on YouTube: the part that bites
Ask for unlisted. YouTube has no Studio draft through the API, so unlisted is the review state, and it is worth using because two of the things that matter most here are easy to get wrong in one pass: the title is capped at 100 characters, and the thumbnail is the single biggest lever on click-through. Claude can show you both, then flip the video to public with update_youtube_video.
Claude Desktop uses the same Connectors flow as claude.ai, so there is no separate desktop setup.
Research YouTube before you post
search_youtube searches the public YouTube index. That is a different question from “what have I uploaded”, and list_youtube_videos is the tool for that one. For a competitor’s film, analyze_video returns the voiceover, the on-screen text and the beat list with timestamps, which is what you actually want before rebuilding a hook.
The paid half
Hermoso’s Google Ads tools build search, display and Performance Max campaigns (the whole tree in one atomic operation, read back from Google before your agent narrates it), plus Keyword Planner volumes, conversion actions, and sitelinks and callouts created and attached. There is no YouTube video-campaign builder, and it would be wrong to imply one; a YouTube video asset can be uploaded and attached, but the campaign types Hermoso creates are search, display and Performance Max.
What Claude 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 Claude, post to: Facebook · Instagram · Threads · TikTok · X · LinkedIn · Pinterest · Bluesky · Telegram. Or see everything Claude can publish to.
Post to YouTube from: ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Perplexity · Le Chat · Claude Cowork · Perplexity Computer · Paperclip · AI marketing in Claude
Frequently asked questions
Can Claude post to YouTube?
Yes, through Hermoso's MCP server. In Claude, add https://app.hermoso.ai/mcp as a custom connector and approve it with your Hermoso account. There is no key to paste. Claude then has 922+ tools, including the ones that publish to YouTube, plus the ones that research the ads already running in your market and render the creative in the first place.
How do I connect YouTube to Claude?
Two steps, once each. In Claude, 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 YouTube inside Hermoso under Settings → Connectors, which is an OAuth consent screen in a browser. After that Claude publishes to YouTube as an ordinary tool call.
What is the YouTube caption limit when posting from Claude?
A YouTube title is capped at 100 characters. The description is a separate field of up to 5,000 characters, with up to 30 tags. A scheduled item’s text becomes the title, so both must be passed explicitly. Hermoso enforces it when the post is created or queued, so Claude is told immediately rather than failing later when nobody is watching.
Can Claude schedule a YouTube post for later?
Yes. schedule_post queues it on one calendar shared with every other channel, with a per-channel caption if the copy should differ, and list_scheduled and cancel_scheduled read and pull it back. YouTube is one of the eleven channels that queue.
Can Claude post privately or as a draft to YouTube?
Yes: public, unlisted or private. There is no Studio draft in YouTube’s API, so unlisted is the review state, and an immediate post defaults to it. Hermoso refuses a visibility YouTube cannot honour at the moment you ask for it, rather than quietly publishing something weaker.
What does it cost to post to YouTube from Claude?
Publishing to YouTube costs no credits; YouTube charges nothing per API call. Credits are spent generating the video and the thumbnail. Plans are $29, $69 and $149 a month for 1,200, 3,000 and 7,000 credits, and every feature is on every plan including Free. The only exception is enterprise SSO.
Start free with 30 credits at signup and 250+ more to earn. Every feature is on every plan. Credits are spent only on AI models and Ad Spy research; posting, scheduling, ads management and analytics are free.
Start free → See pricing