Hermoso is a marketing MCP server: 906+ 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. Perplexity reaches all of it through one connection. This page covers one slice of that: what Perplexity can actually do on Facebook, and what Facebook will not let it do.
Connect Hermoso to Perplexity
- Copy the connector URL.
https://app.hermoso.ai/mcp - Perplexity → Customize → Connectors. In the left sidebar open Customize, then the Connectors tab → Custom connector (top right) → Add MCP connector.
- Fill in the connector. Name it Hermoso and paste the URL as the MCP server URL. Expand Advanced: Authentication OAuth, leaving Client ID and Client Secret empty (Perplexity reads Hermoso’s OAuth endpoints from its discovery document and identifies itself with its own client metadata, so there is nothing to create or paste), Transport Streamable HTTP, Network access Public. Tick I understand custom connectors can introduce risks and press Add.
- Sign in. On the Hermoso card click + (Add connector) and approve on the Hermoso consent page with your Hermoso account.
- Switch it on in a chat. A custom connector is off until you pick it: + (Add files or tools) → Connectors → tick Hermoso.
- Ask Perplexity 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.
Custom connectors are on Perplexity’s paid plans. In an Enterprise organization, members can add their own only if an admin has switched on Allow members to add custom connectors, which is off by default, and an admin can instead add Hermoso once for everyone. We ran these steps end to end on 2026-09-28 from a Perplexity Pro account: the connector signed in and answered with the account’s credit balance and brand list. Hermoso is not affiliated with or endorsed by Perplexity.
Then connect Facebook 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 Facebook tools Perplexity gets
post_to_meta: publishes text, an image, a video or a multi-photo post to the Page, and takespageIdso it never has to guess which Page.schedule_post: queues the same post for a time you choose, on one calendar shared with every other channel.list_meta_pages: lists the Pages the account has connected, with their ids.manage_meta_post: edits the copy of a published post, or deletes it.list_meta_comments / reply_to_meta_comment / moderate_meta_comment: reads the comments under a post, replies as the Page, and hides or deletes what should not be there.meta_page_insights / meta_post_insights: Page-level and per-post reach, impressions and engagement.upload_meta_asset: puts a finished render into the ad account’s asset library.
Facebook is also the one channel with native remote scheduling. post_to_meta takes a scheduleAt between ten minutes and thirty days out and hands the timing to Meta itself. Instagram and Threads have no such thing in Meta’s API, and passing it for them is refused rather than quietly posted immediately.
Facebook limits worth knowing before you automate anything
| Text | A Facebook post can run to 63,206 characters, which is effectively no limit. 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 or draft. A draft is a genuinely unpublished Page post, which is the useful one for review: it exists in Meta Business Suite and nobody outside can see it. There is no unlisted and no private option: “a Facebook Page post is either published or held as an unpublished draft”. |
| Carousel | 2 slides and up, photos only. Meta publishes no maximum for attached_media that we could source, so Hermoso does not invent one and attribute it to Facebook. The only bound is ours, at 30 slides, and the refusal says whose it is: “Facebook publishes no documented maximum for attached_media, so this bound is ours, not theirs.” Video cannot ride in a Facebook photo carousel; that is a different edge on Meta’s API and Hermoso refuses rather than silently dropping the clip. |
| Which account | pageId. It matters the moment a brand connects more than one Page: the publish path refuses by name instead of picking one for you, and a schedule that could not carry the answer would turn that refusal into a failure hours later with nobody watching. |
Try it in Perplexity
Ask for it in ordinary language. These are plain sentences, not a DSL:
“Find what our category’s longest-running Facebook ads have in common, make a 4:5 image ad from that angle, and hold it on our Page as an unpublished draft.”
That walks find_competitors → search_meta_ads → plan_ad → render_ad → list_meta_pages → post_to_meta. How Perplexity confirms a tool call is Perplexity’s setting, not ours. Hermoso’s own gates hold either way: campaigns are born paused, spend switches and deletes need an explicit confirmation, and every render is priced before it runs.
Perplexity on Facebook: the part that bites
Research is where Perplexity is strongest, and search_meta_ads reads the Meta Ad Library itself, so the answer rests on what competitors are running rather than on articles about them. Ask for a draft on the publishing side. A Facebook draft is a real unpublished Page post you can check in Business Suite, and a published one can still be edited or deleted.
Choose Streamable HTTP, not SSE, when you add the connector. Hermoso has no SSE endpoint, so an SSE connector fails the check Perplexity runs when you save it. In an Enterprise org, a connector an admin adds does not show up for members until it is shared from the Permissions screen.
Research Facebook before you post
The Meta Ad Library is the richest public creative archive there is, and search_meta_ads reads it by keyword or by page, covering both Facebook and Instagram placements. pull_competitor_ads and competitor_teardown build on it, and find_competitors works out who to point them at.
The paid half
Facebook is the deepest paid surface Hermoso has. create_meta_campaign, create_meta_adset and create_meta_ad build the whole tree with real targeting: geography down to a city radius, interests, behaviours, custom audiences and lookalikes, placements, dayparting, bid and cost caps. Everything is created PAUSED with no caller override, and the summary your agent reports is built from a read-back of what Meta actually stored, never from what was requested. Before a budget is committed, preview_meta_ad renders the real ad per placement as a link you can look at and estimate_meta_reach says how many people the targeting actually reaches. One warning that saves money: an ad set created with no locations defaults to the United States only, and the read-back says so loudly.
What Perplexity 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 Perplexity, post to: Instagram · Threads · TikTok · YouTube · X · LinkedIn · Pinterest · Bluesky · Telegram. Or see everything Perplexity can publish to.
Post to Facebook from: Claude · ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Hermes · Gemini CLI · Le Chat · Claude Cowork · Perplexity Computer · Paperclip
Frequently asked questions
Can Perplexity post to Facebook?
Yes, through Hermoso's MCP server. In Perplexity, add https://app.hermoso.ai/mcp as a custom connector and approve it with your Hermoso account. There is no key to paste. Perplexity then has 906+ tools, including the ones that publish to Facebook, plus the ones that research the ads already running in your market and render the creative in the first place.
How do I connect Facebook to Perplexity?
Two steps, once each. In Perplexity, 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 Facebook inside Hermoso under Settings → Connectors, which is an OAuth consent screen in a browser. After that Perplexity publishes to Facebook as an ordinary tool call.
Can Perplexity post privately or as a draft to Facebook?
Yes. Facebook is the one channel with a genuine draft: an unpublished Page post that exists in Meta Business Suite and that nobody outside can see. Hermoso refuses a visibility Facebook cannot honour at the moment you ask for it, rather than quietly publishing something weaker.
What does it cost to post to Facebook from Perplexity?
Publishing to Facebook costs no credits, because Meta charges nothing per API call. Credits are spent on generation: rendering the image or video the post carries. 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.
What is the Facebook caption limit when posting from Perplexity?
A Facebook post can run to 63,206 characters, which is effectively no limit. Hermoso enforces it when the post is created or queued, so Perplexity is told immediately rather than failing later when nobody is watching.
Can Perplexity schedule a Facebook 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. Facebook 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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