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 Pinterest, and what Pinterest 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 Pinterest 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 Pinterest tools Claude gets
list_pinterest_boards: the account’s boards, including secret ones, with their ids.create_pinterest_board: makes a new board.post_to_pinterest: creates an image or video Pin on a board you name, with a title, a description, a destination link and alt text.schedule_post: queues the Pin, carryingboardId.list_pinterest_ads_campaigns / pinterest_ads_report: read the paid side.
The limit you need before you plan a Pinterest workflow: this app holds Trial access, and Pinterest refuses Pin creation in production on Trial. Their words, caught on the first real Pin: “Apps with Trial access may not create Pins in production.” Boards and reads do work on Trial (listing boards, creating boards, reading Pins), and Hermoso’s error names the access tier rather than telling you to reconnect, because reconnecting cannot fix it. An upgrade to Standard access is what unblocks Pin creation, and it is pending review. The same tier limits the paid side: on Trial, Pinterest exposes no ad accounts at all.
Pinterest limits worth knowing before you automate anything
| Text | A Pin description is capped at 800 characters and a Pin title at 100. 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, and the control is the board rather than the Pin. A Pin inherits its board’s public or secret state, so “post it somewhere private” is expressed by choosing a secret board. That is why the board is a required argument rather than a default. |
| Carousel | 2 to 5 images, images only. Both bounds come straight from Pinterest’s own v5 OpenAPI (minItems: 2, maxItems: 5), which is the only machine-readable source Pinterest publishes (their developer site is a client-rendered app that returns nothing to a fetch). There is no multi-video source, so a video slide is refused rather than dropped. |
| Which account | boardId, and it is the only identity field refused at enqueue rather than at publish time. Leave it out and nothing is scheduled, because “a Pin on the wrong board is a public mistake, so we never choose one for you.” |
Try it in Claude
Ask for it in ordinary language. These are plain sentences, not a DSL:
“List my Pinterest boards, create one called “Autumn drop”, and generate five vertical Pin images for it with titles and descriptions ready to go.”
That walks list_pinterest_boards → plan_ad → generate_image → post_to_pinterest. 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 Pinterest: the part that bites
Everything up to the Pin works on Trial access, and Claude is a comfortable place to do it: boards, creative, titles, descriptions and alt text. Pin creation is the step Pinterest blocks in production for Trial apps, in their own words, and Hermoso’s error names the access tier instead of telling you to reconnect, because reconnecting cannot change it.
Claude Desktop uses the same Connectors flow as claude.ai, so there is no separate desktop setup.
Research Pinterest before you post
There is no Pinterest ad library, so competitor research on Pinterest is not something Hermoso claims. The creative you would run there is well covered by the rest of the studio: make_template_ad and the image models produce the vertical, text-forward stills the surface rewards.
The paid half
Pinterest Ads tools exist for a campaign, an ad group and an ad that promotes an existing Pin, with archiving instead of deleting, because Pinterest’s ADS API has no delete verb (organic Pins and boards do delete, through delete_pinterest_pin and delete_pinterest_board; it is the paid objects that can only be archived). But the same Trial-access tier that blocks Pin creation exposes no ad accounts, so ad writes are not usable until Standard access lands. That is the honest state, and it is better in a sentence here than discovered on a deadline.
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 · YouTube · X · LinkedIn · Bluesky · Telegram. Or see everything Claude can publish to.
Post to Pinterest 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 Pinterest?
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 Pinterest, plus the ones that research the ads already running in your market and render the creative in the first place.
How do I connect Pinterest 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 Pinterest inside Hermoso under Settings → Connectors, which is an OAuth consent screen in a browser. After that Claude publishes to Pinterest as an ordinary tool call.
Does Claude need my Pinterest password?
No. You connect Pinterest to Hermoso once through an OAuth consent screen in a browser, and Claude 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.
What does it cost to post to Pinterest from Claude?
Pinterest charges nothing per API call, so publishing costs no credits. Credits are spent generating the Pin creative. 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.
Can Claude post a carousel to Pinterest?
Yes in principle: 2 to 5 images, images only, straight from Pinterest’s own v5 OpenAPI. In practice Pin creation itself is blocked in production while this app holds Trial access. Claude calls the same publish tool either way, and a channel that cannot carry a carousel is refused with the real reason attached.
Can Claude schedule a Pinterest 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. Pinterest is one of the eleven channels that queue.
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.
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