Post to Bluesky from Hermes

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. Hermes reaches all of it through one connection. This page is about one slice of that — what Hermes can actually do on Bluesky, and what Bluesky will not let it do.

Connect Hermoso to Hermes

1. Install and sign in.

   npm install -g hermoso && hermoso auth login

   Your browser opens once. Nothing to create and nothing to paste: the credential is stored owner-only in ~/.hermoso/config.json. On a machine with no browser, hermoso auth login --token hmk_… takes a key from MCP & CLI → Terminal & API keys instead.
2. Add it to ~/.hermes/config.yaml. mcp_servers is a top-level key, not nested under mcp, and no key goes in the file because hermoso mcp reads the sign-in above:

   mcp_servers:
     hermoso:
       command: "npx"
       args: ["-y", "hermoso", "mcp"]

3. Ask Hermes 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.

Hermoso is not affiliated with or endorsed by the makers of Hermes and does not claim to be. The shape above is quoted from the project's own MCP reference in NousResearch/hermes-agent, read on 2026-08-23; it is documented rather than run here, which is why it is the published file shape and not a bespoke install command.

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 Hermes 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

Try it in Hermes

Ask for it in ordinary language — these are sentences, not a DSL:

“Post one Bluesky update per shipped feature, under 300 characters, with the screenshot attached and alt text written, and collect replies for a daily digest.”

That walks get_brand → generate_image → post_to_bluesky → bluesky_post_metrics. Approval behaviour is yours to configure. Hermoso’s own guarantees do not depend on it: campaigns are born paused, spend switches are confirm-gated, and no generation call runs without a verified account behind it.

Hermes on Bluesky: the part that bites

Scheduling is where a length mistake hurt most, because a queued post that is too long used to fail after you had gone. Hermoso checks Bluesky’s 300-character cap when the post is queued and the 3,000-byte limit at publish, so an automated batch fails at the point you can still fix it. Video goes up as MP4, with up to twenty WebVTT caption tracks if you have them.

For unattended runs the hermoso CLI with --json is easier to assert on than a tool manifest, and much cheaper in context.

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 Hermes 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 Hermes, post to: Facebook · Instagram · Threads · TikTok · YouTube · X · LinkedIn · Pinterest · Telegram — or see everything Hermes can publish to.

Post to Bluesky from: Claude · ChatGPT · Claude Code · Cursor · Codex · Cline · OpenClaw · Grok Bot · Gemini CLI · Perplexity · Le Chat

Frequently asked questions

Can Hermes post to Bluesky?

Yes, through Hermoso's MCP server. Run npm install -g hermoso && hermoso auth login, then add hermoso under the top-level mcp_servers key in ~/.hermes/config.yaml with command "npx" and args ["-y", "hermoso", "mcp"]. The browser sign-in stores the credential, so no key goes in the file. Hermes 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 Hermes?

Two steps, once each. Run npm install -g hermoso && hermoso auth login, then add hermoso under the top-level mcp_servers key in ~/.hermes/config.yaml with command "npx" and args ["-y", "hermoso", "mcp"]. The browser sign-in stores the credential, so no key goes in the file. 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 Hermes publishes to Bluesky as an ordinary tool call.

What is the Bluesky caption limit when posting from Hermes?

A Bluesky post is capped at 300 characters and at 3,000 bytes, so an emoji-heavy post can be under 300 characters and still be refused; Hermoso says which limit applied and by how much. Hermoso enforces it when the post is created or queued, so Hermes is told immediately rather than failing later when nobody is watching.

Can Hermes schedule a Bluesky 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. Bluesky is one of the ten channels that queue.