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 Threads, and what Threads 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 Threads 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 Threads tools Le Chat gets
post_to_meta— publishes withtarget: "threads"— text, image or video, and optionally geotagged.schedule_post— queues it alongside every other channel.list_threads_posts / threads_insights— what you have posted, and how each one did.list_threads_replies / reply_to_thread / hide_thread_reply— read the replies, answer as the brand, hide what does not belong.list_threads_mentions— who is talking about you.search_threads_keyword / search_threads_locations— keyword search and the location ids a geotag needs.delete_thread— removes a post.
Threads is the channel where Hermoso goes furthest past publishing. Beyond posting there is a full read-and-respond surface — replies, mentions, keyword search and per-post insights — which is what makes it usable as a listening channel and not just an outlet. Note that Threads is a separate OAuth grant from Facebook even though it shares the Page.
Threads limits worth knowing before you automate anything
| Text | A Threads post is capped at 500 characters — the tightest here except X. 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 — “Threads has no unlisted, private or draft post.” A Threads post exists publicly or not at all. |
| Carousel | 2 to 20 slides, images and video mixed. Both bounds are Meta’s own words, quoted in the table that enforces them: “Carousels must have at least 2” items, and “no more than 20 total images, videos, or a mix of the two.” That makes Threads the most generous mixed-media carousel of any channel here. |
| Which account | pageId — the same connected Page identity carries Facebook, Instagram and Threads. |
Try it in Le Chat
Ask for it in ordinary language — these are sentences, not a DSL:
“Post a Threads update under 500 characters about the launch, then show me the replies and draft answers to the three most common questions.”
That walks get_brand → generate_text → post_to_meta (target: "threads") → list_threads_replies. 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 Threads: the part that bites
Split the permissions the way the tools split. list_threads_replies, list_threads_mentions and threads_insights have no public effect and can be always-allowed, while reply_to_thread speaks as the brand and should keep asking. The 500-character cap is checked when the post is queued.
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 Threads before you post
search_threads searches public Threads by keyword through the research surface, and search_threads_keyword does the same through your connected Threads account. There is no Threads ad library, because there are no Threads ads to archive.
The paid half
There is no Threads ads product in Hermoso, and it would be wrong to imply one. Threads here is an organic channel: publish, read, reply, measure. The paid tools cover Meta (Facebook and Instagram), 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 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 · TikTok · YouTube · X · LinkedIn · Pinterest · Bluesky · Telegram — or see everything Le Chat can publish to.
Post to Threads from: Claude · ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Perplexity
Frequently asked questions
Can Le Chat post to Threads?
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 Threads — and the ones that research the ads already running in your market and render the creative in the first place.
How do I connect Threads 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 Threads inside Hermoso under Settings → Connectors, which is an OAuth consent screen in a browser. After that Le Chat publishes to Threads as an ordinary tool call.
Can Le Chat post a carousel to Threads?
Yes — 2 to 20 slides, images and video mixed. Both bounds are Meta’s own published numbers for the Threads API. Le Chat calls the same publish tool either way, and a channel that cannot carry a carousel is refused with the real reason attached.
Can Le Chat research Threads before it posts?
Yes. search_threads searches public Threads by keyword through the research surface, and search_threads_keyword does the same through your connected account.
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