Hermoso is a marketing MCP server: 850+ 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 is about one slice of that — what Le Chat can actually do on Bluesky, and what Bluesky will not let it do.
Connect Hermoso to Le Chat
- Copy the connector URL.
https://app.hermoso.ai/mcp - Le Chat → Intelligence → Connectors → + Add Connector → Custom MCP Connector. Name it Hermoso and paste the URL.
- 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 Bluesky itself, once, under Settings → Connectors in Hermoso, with your handle and a Bluesky app password. There is no consent screen: the app password is made in Bluesky’s own settings, and it can be revoked there without touching your real password.
The Bluesky tools Le Chat gets
post_to_bluesky— publishes a post as the connected account: up to 300 characters, with up to four images and alt text, or one MP4 video with optional caption tracks. A link with no media gets a preview card, which Hermoso builds because Bluesky does not fetch one.schedule_post— queues it on the calendar every other channel shares, with the 300-character cap checked when it is queued rather than when it fires.list_bluesky_posts— the account’s own recent posts with their AT-URIs and live counts, marking reposts so someone else’s post is never read as yours.bluesky_post_metrics / bluesky_account— likes, reposts, replies, quotes and bookmarks per post, and followers, following and post count for your account or any public one.list_bluesky_convos / read_bluesky_dm / send_bluesky_dm— read and answer direct messages, including message requests from people the account does not follow.manage_bluesky_convo / react_to_bluesky_dm / mark_bluesky_convo_read— accept a request, mute, lock or leave a conversation, react with one emoji, and clear unread counts.delete_bluesky_post— removes a post, after a first call that deletes nothing and reads back what would go.
Bluesky connects with an app password rather than a sign-in screen: create one in Bluesky’s settings and paste it with the handle under Settings → Connectors. Tick direct-message access when you create it, or the DM tools will tell you the password cannot chat, which is a property of the password and not a broken connection. Two more Bluesky rules Hermoso checks before sending: a video needs a confirmed email on the Bluesky account, and a link card and an image cannot share a post. Publishing costs no credits, because Bluesky charges nothing per call.
Bluesky limits worth knowing before you automate anything
| Text | A Bluesky post is capped at 300 characters and, separately, at 3,000 bytes, so an emoji-heavy post can be under 300 characters and still too long. 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 | Public only. A Bluesky post is a public record on the AT Protocol, and there is no unlisted, private or draft form of one. The review happens before the call, never after it. |
| Carousel | 2 to 4 images, images only. Four is Bluesky’s own number, from the AT Protocol lexicon for an image embed, and a fifth is refused rather than dropped. A video is a different embed that carries exactly one clip, and a post has a single embed, so a Bluesky post is images, one video or a link card: one of the three. |
| Which account | None, unless the brand has connected more than one Bluesky account. Then account names which, and several with none named is refused by name rather than guessed. |
Try it in Le Chat
Ask for it in ordinary language — these are sentences, not a DSL:
“Post a Bluesky update under 300 characters with our launch image and alt text, then list unread DMs and draft a reply to each.”
That walks get_brand → generate_image → post_to_bluesky → bluesky_post_metrics. 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 Bluesky: the part that bites
send_bluesky_dm names one recipient every time; there is no broadcast form, by design. A DM allows 1,000 characters, not a post’s 300. Keep the send on manual approval in Le Chat and let the list and read tools run freely. If the DM tools refuse, the saved app password was created without direct-message access, which is fixed in Bluesky’s settings, not by reconnecting.
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 Bluesky before you post
There is no Bluesky ad library and no Bluesky search in Hermoso, so competitor research there comes down to one honest thing: bluesky_account reads any public account’s followers, following and post count, which is enough to size a competitor and chart it week by week. Everything else in the research surface (the Meta, Google and LinkedIn ad libraries, organic TikTok, Instagram, YouTube, Reddit and Threads) is unaffected.
The paid half
There is no Bluesky ads product in Hermoso, and we do not imply one. Bluesky here is organic: publish, schedule, read, reply and measure. The paid tools cover Meta, Google Ads, Microsoft Advertising, Reddit Ads, LinkedIn, Pinterest, X Ads, TikTok Ads, Snapchat Ads, ChatGPT Ads and Apple Search Ads.
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 — 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 yours: creating the Bluesky app password and connecting it once. Everything after that is a tool call.
The rest of the matrix
From Le Chat, post to: Facebook · Instagram · Threads · TikTok · YouTube · X · LinkedIn · Pinterest · Telegram — or see everything Le Chat can publish to.
Post to Bluesky from: Claude · ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Perplexity
Frequently asked questions
Can Le Chat post to Bluesky?
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 850+ tools, including the ones that publish to Bluesky — and the ones that research the ads already running in your market and render the creative in the first place.
How do I connect Bluesky 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 create an app password in Bluesky's settings (tick direct-message access if you want the DM tools) and paste it with your handle under Settings → Connectors in Hermoso. After that Le Chat publishes to Bluesky as an ordinary tool call.
Does Le Chat need my Bluesky password?
No, and not your main Bluesky password either. Bluesky connects to Hermoso with an app password, which you create in Bluesky's settings and can revoke there at any time, and Le Chat then reaches the account as a tool call. No credential is ever handed to the model.
Can Le Chat research Bluesky before it posts?
Only lightly. There is no Bluesky ad library or search in Hermoso, but bluesky_account reads any public account’s followers, following and post count, which is enough to size a competitor.
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