Hermoso is a marketing MCP server: 876+ 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 Cowork reaches all of it through one connection. This page covers one slice of that: what Claude Cowork can actually do on Pinterest, and what Pinterest will not let it do.
Connect Hermoso to Claude Cowork
- Copy the connector URL.
https://app.hermoso.ai/mcp - Claude → Customize → Connectors → ＋ Add → Add custom connector. Name it Hermoso and paste the URL. Leave the sign-in option on Claude’s default: Hermoso accepts Claude’s published client identity and also registers clients automatically, so there is no client ID to create.
- Connect and approve. Sign in with your Hermoso account on the consent page. No key is pasted.
- Open Cowork and hand it the job. Cowork sees the same connector. Ask it to list your connected channels first, so you know which accounts it can reach.
- Ask Cowork 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.
Anthropic’s help center lists custom connectors on Claude, Cowork and Claude Desktop, and Cowork itself on the paid plans: Pro, Max, Team and Enterprise. On Team and Enterprise an Owner adds Hermoso once under Organization settings, Connectors, and members press Connect. One detail decides the route: a local server in claude_desktop_config.json is not available in Cowork, so the hosted connector is the way in, not npx hermoso mcp. Read from Anthropic’s help center on 2026-10-03. Hermoso is not affiliated with or endorsed by Anthropic.
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 Cowork 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 Cowork
Ask for it in ordinary language. These are plain sentences, not a DSL:
“Create a Pinterest board for our autumn range and generate eight vertical Pin images with titles and descriptions for it.”
That walks list_pinterest_boards → plan_ad → generate_image → post_to_pinterest. How often Cowork stops to check with you is Cowork’s behaviour, not ours. Hermoso’s gates hold either way: campaigns are born paused, and spend switches and deletes need an explicit confirmation.
Claude Cowork on Pinterest: the part that bites
Board listing and creation work on Trial access, so a Cowork task can finish the structure and the creative today. Pin creation is refused in production by Pinterest for Trial apps, and Hermoso’s error names the access tier rather than suggesting a reconnect, so a task that retries gets the same answer.
Cowork can run shell commands, but Anthropic’s default network setting for that sandbox allows package registries rather than every domain, so the hermoso command line is not something to rely on there. The connector is unaffected: Anthropic says connector traffic keeps working whatever the sandbox’s network setting is.
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 Cowork 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 Cowork, post to: Facebook · Instagram · Threads · TikTok · YouTube · X · LinkedIn · Bluesky · Telegram. Or see everything Claude Cowork can publish to.
Post to Pinterest from: Claude · ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Perplexity · Le Chat · Perplexity Computer · Paperclip · AI marketing in Claude
Frequently asked questions
Can Claude Cowork post to Pinterest?
Yes, through the Hermoso connector you add in Claude. In Claude, open Customize, Connectors, add a custom connector with https://app.hermoso.ai/mcp and approve it with your Hermoso account. Cowork uses the same connector, and there is no key to paste. Claude Cowork then has 876+ 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 Cowork?
Two steps, once each. In Claude, open Customize, Connectors, add a custom connector with https://app.hermoso.ai/mcp and approve it with your Hermoso account. Cowork uses the same connector, and 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 Cowork publishes to Pinterest as an ordinary tool call.
Does Claude Cowork need my Pinterest password?
No. You connect Pinterest to Hermoso once through an OAuth consent screen in a browser, and Claude Cowork 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 Cowork?
Pinterest charges nothing per API call, so publishing costs no credits. Credits are spent generating the Pin creative. Plans are $19, $49 and $149 a month for 1,000, 3,000 and 10,000 credits, and every feature is on every plan including Free. The only exception is enterprise SSO.
Can Claude Cowork 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 Cowork calls the same publish tool either way, and a channel that cannot carry a carousel is refused with the real reason attached.
Can Claude Cowork 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 ten 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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