Muse + PostAxis

Schedule social media posts with Muse

Muse is Meta’s personal agent. Add PostAxis as a custom connector by sending Muse one message, sign in once, and Muse can plan, schedule and publish your posts while it works on your goals.

Connect with one chat message
OAuth sign-in, no API key
Works on web, iOS, Android and WhatsApp

Open Muse Start for $0

Set up Muse with PostAxis

Plug PostAxis into Muse once, then talk to it like you would to whoever runs your accounts. Every click is in the full guide below.

Plug in about a minute

Step 1 of 2

Add PostAxis to Muse by message

Muse adds custom connectors from chat. Send it the PostAxis MCP link, approve the sign-in it sends back, and it is connected everywhere you use Muse.

PostAxis account
A connected social account
Muse installed

Message to Muse

Add my PostAxis connector: https://postaxis.io/api/mcp (standard MCP over HTTP with OAuth). Send me the sign-in link and I will approve it. Save a skill so you use PostAxis for social media posts.

Muse has no MCP settings screen: custom connectors are added by message. The same connector then works on the web, the mobile apps and WhatsApp.

Talk

Step 2 of 2

Then tell Muse what you need

Muse picks the PostAxis tools it needs. Scheduled posts go out on time whether or not the chat is still open.

Try asking

Which accounts can you post to?
What goes out this week?
Keep that one as a draft

Plan next week: one product tip a day on Instagram and Threads at 18:00.

Your week is planned: 5 tips, Monday to Friday at 18:00. I added it to Goals so I can plan the next one.

via PostAxis

Example answer · lands in your PostAxis calendar

Full setup guide for Muse

Every step from a new PostAxis account to your first scheduled post. Takes about a minute once your accounts are connected.

1
Create your PostAxis account
Sign up at app.postaxis.io. Every plan starts with a 7-day free trial and includes MCP access with OAuth sign-in. Create an account
2
Connect your social accounts
Open Accounts in PostAxis and connect the networks you want to post to: Instagram, TikTok, YouTube, X, LinkedIn, Facebook, Threads or Telegram. Your agent can only post to accounts connected here, and it never sees your social media passwords. Open Accounts

Send Muse the connect message

Open Muse on the web, in the app or on WhatsApp and send this message. Muse has no MCP settings screen; it sets up custom connectors from chat.

Copy this

Add my PostAxis connector: https://postaxis.io/api/mcp (standard MCP over HTTP with OAuth). Send me the sign-in link and I will approve it. Save a skill so you use PostAxis for social media posts.

4
Approve the sign-in
Muse replies with a sign-in link. Open it, log in to PostAxis and click Approve. Muse connects with your account only.
5
Check the connection
Ask “Which PostAxis accounts can you post to?”. Muse should list your connected social accounts.
6
Give it a goal
Ask for posts, or add an ongoing goal such as a weekly content plan. Muse asks for your approval before it schedules.

What can Muse do with PostAxis?

Everything PostAxis does in the dashboard that makes sense to do by asking: writing, scheduling, editing, publishing and checking your queue.

Sentences in, posts out

Describe the post in your own words. Muse turns it into posts and PostAxis handles the scheduling.

Every network you run

Instagram, TikTok, YouTube, X, LinkedIn, Facebook, Threads and Telegram, from a single message.

Checked before it’s saved

Caption length, media count, video length and format are checked for every network before anything is saved.

Weeks ahead in one go

Ask for a week or a month. Muse can dry-run up to 50 posts at once, show you the plan, then schedule it.

Your images and video

Attach images and videos from a link, or get a one-time upload link for files on your computer.

Your accounts, your call

Muse signs in as you and can only reach accounts connected in your workspace. Cut it off from Settings whenever you like.

What is Muse?

Muse is Meta’s personal AI agent, available on the web, iOS, Android and WhatsApp. It works through goals in its own secure environment and connects to outside services through connectors, including custom ones you add by message.

With PostAxis connected, Muse can turn a goal like “post a tip every day” into a scheduled week of posts, and ask for your approval before anything goes out.

What can you ask Muse to post?

Brief it like a person: what it’s about, where it goes, when. Four requests that work well with Muse:

Long task
Fill a 30-day calendar
Plan 30 days of posts for X, LinkedIn and Threads, validate them all, show me the calendar and schedule after I approve.
To Muse
From your day
Notes into a post
Turn what I told you about today’s launch into a LinkedIn post for tomorrow at 9:00.
To Muse
Right now
Post an update immediately
The outage is fixed. Post a short all-clear to our Telegram channel and Facebook page now and confirm when both are up.
To Muse
Report
Review the week
Tell me which posts published this week and which failed, and reschedule the failed ones for tomorrow.
To Muse

How does Muse talk to PostAxis?

Through MCP, the Model Context Protocol: an open standard for giving AI apps tools. PostAxis runs an MCP server; Muse connects to it and gets 11 tools that work on your account, nothing more. Full MCP reference

From your message to a scheduled post

What happens between you hitting enter and the post showing up in your calendar.

You write one message: what, where, when
Muse looks up your accounts and the limits of each network you named
It drafts a version per network and sends them to PostAxis
PostAxis checks every version and saves it as scheduled, a draft or live
The post sits in your calendar, editable until it goes out

Muse + PostAxis

Server: https://postaxis.io/api/mcp
Transport: Streamable HTTP
Sign-in: OAuth 2.1

Tools Muse discovers

list_workspacesYour PostAxis workspaces
list_accountsConnected social accounts per workspace
get_platform_rulesCaption limits and media rules per network
upload_media_from_urlPull an image or video into your media library
create_upload_linkOne-time link for uploading a local file
create_postDraft, schedule or publish one post
create_posts_bulkSchedule up to 50 posts in one call
list_postsPosts by status or date range
get_postOne post with its per-network status
update_postEdit text, media or time before it goes out
delete_postRemove a draft or scheduled post

Does Muse post without asking me?

Muse shows an approval card before sensitive actions, so you can review the plan first. Everything it schedules also appears in your PostAxis calendar, where you can edit or delete it.

Can Muse schedule 30 days of posts at once?

Yes. Muse can send up to 50 posts in one bulk call. Ask it to validate first: PostAxis checks every post and saves nothing, so you can review the plan before it is scheduled.

Plan 30 days of posts for X and LinkedIn about our product, validate them, show me the calendar, then schedule.

Done. Here’s what I did:

Validated 30 posts, each going to X and LinkedIn, 0 problems
Showed the calendar and waited for approval
Scheduled all 30 for 10:00 each day

via PostAxis

Example conversation

How does Muse sign in to PostAxis?

Muse signs in to PostAxis, never to your social networks. Your Instagram, X or LinkedIn accounts stay connected to PostAxis, and you can revoke Muse’s access at any time.

Every plan✓ Used by Muse

OAuth sign-in

Muse opens the PostAxis sign-in in your browser
You log in and click Approve
It gets access to your account only, until you revoke it

Best for apps you use yourself: ChatGPT, Claude, Cursor, Codex and most others

API add-on

API key

Create a key under Settings → API keys
Send it as Authorization: Bearer KEY, or in the URL for clients that only take a URL
Revoke the key any time and access stops at once

Best for servers and automations with no browser: n8n, Grok, Manus, headless agents

If something doesn’t work

The most common problems when connecting Muse, and how to fix them.

Muse did not send a sign-in link

Repeat the message and say “use OAuth and send me the sign-in link”. Connector setup in Muse is new and can change during the rollout.

The agent says no accounts are connected

Connect at least one social account under Accounts in PostAxis. If you use several workspaces, tell the agent which one, for example “use my Acme workspace”.

401 Unauthorized or “sign in again”

The sign-in expired or was revoked. Reconnect from your agent (it opens the PostAxis sign-in again). With an API key, check the key is still active under Settings → API keys.

A post was rejected before saving

PostAxis checks each network’s rules first: caption length, media count, video length and format. The error says what to change; ask the agent to fix it and try again.

Posts are scheduled at the wrong time

Say the timezone in your request, for example “9:00 Europe/Berlin”. Without one, the agent uses the timezone it was told or UTC.

I want to stop an agent from posting

Open Settings → API keys in PostAxis. Revoke the agent under Connected agents, or revoke its API key. It loses access immediately.

Muse and PostAxis: questions

Do I need an API key to connect Muse?

No. The PostAxis MCP server uses OAuth: Muse sends you a sign-in link, you log in to PostAxis and approve. No key to copy or store.

What is the PostAxis MCP server?

It’s a remote Model Context Protocol server at https://postaxis.io/api/mcp that gives AI agents 11 tools to list your accounts, upload media and create, schedule, edit and delete posts in PostAxis.

Which social networks are supported?

Instagram (posts, Reels, carousels), TikTok (videos and photo posts), YouTube Shorts, X, LinkedIn, Facebook Pages, Threads and Telegram channels.

How much does it cost?

MCP access with OAuth is included in every PostAxis plan, and every plan starts with a 7-day free trial. API keys need the API add-on.

What stops an agent from posting something wrong?

PostAxis checks every post against each network’s rules before saving, the agent can preview bulk plans without saving them, everything shows up in your calendar, and you can revoke an agent at any time in Settings → API keys.