Connect Claude and ChatGPT to Merrimo

Add Merrimo to Claude or ChatGPT once, and the agent can read and work on your stories from there, wherever you use it. You choose what it may do, and you can disconnect it any time.

Find the address

Choose Merrimo > Settings (or press ⌘,) and click Connected Agents.
Under Connect an Agent, click Copy URL. The address is the same for everyone: https://mcp.merrimo.com/mcp.

Add Merrimo in Claude

In Claude, open Settings > Connectors.
Click Add custom connector.
Paste the address, give the connector a name such as Merrimo, and click Add.

Add Merrimo in ChatGPT

In ChatGPT, turn on developer mode in its settings (connectors need it).
Add a new connector and paste the address.

The menus in those apps change from time to time. If you can't find the spot, look for where the app adds a custom connector or a remote MCP server.

Sign in and choose what it can do

The first time you use the connector, the app opens a Merrimo page in your browser. Sign in with your Merrimo account, then choose one of two kinds of access:

Can read lets the agent look at your stories but change nothing.
Can read and edit also lets it make changes, as you would.

Approve, and you're sent back to the app. The agent can only reach what your account can reach: a story you've only been invited to view stays view-only for it too.

What an agent can do

Today an agent can work with your prose, your story's bible, your cast, your shots, and sharing, and it can bring in pictures it makes itself (below). It can't yet work on the comic canvas; that is coming later. It can't change your account, your password or your plan.

Agents that make pictures

An agent that can make pictures and share them at a link, such as Muse, can make a picture of a character, a place or a prop for you and put it straight into your story. Ask it in the chat, for example “make a picture of Barnaby in the story's style”, and it looks up what Merrimo knows about that character first: the description, the look of the story and who has to match whom.

The picture becomes the current picture of that character, place, prop or panel. Your earlier pictures are kept, and you can step back to them from the Image tab at any time.
The picture follows the story's art style. If the story has none, or the style doesn't seem to fit what you asked for, the agent may ask you which to use before it starts.
To put a picture of your own in the story, give the agent a link to it. An agent such as ChatGPT can also hand over a picture file you attach to the chat. Either way the agent saves its own copy in your story, so the picture stays even if the link goes away.
An agent can only add pictures to stories you let it edit, and it can't add anything that isn't a picture.
Each account has a daily limit on how much agents can add. If you reach it, the agent tells you and you can try again the next day.

This needs Can read and edit access.

Render on your own machines

An agent can also make pictures on your own computers, the machines you already use for rendering in Merrimo, even when you are away from them. Ask it from your phone, for example “redraw panel 4 with Mara in the rain”, and the picture is made on your Mac and put in your story. Nothing is made on someone else's server.

Use from anywhere

On the Mac that runs ComfyUI, choose Merrimo > Settings (⌘,) and click Rendering. This pane is hidden while Use AI is off in the Providers pane.
Under Use from Anywhere, turn on the switch next to the machine's name.
Look at the line under the switch. Reachable from anywhere means an agent can use it now. Not reachable means the machine isn't answering yet: keep Merrimo or Merrimo Compute running on that Mac. Hold the pointer over the switch for a reminder.

Only your own agents can use a machine you turn on here, and only for stories you can edit. A collaborator can't, even if you share the machine with them. The agent needs Can read and edit access.

Keep working with Merrimo closed

A machine is only reachable while something on that Mac is running. The first time you turn on a machine, Keep available when Merrimo is closed appears below the switches, already on. It lets a small helper, Merrimo Compute, keep your machines available after you quit Merrimo. It is a macOS login item with no window and no Dock icon, so it keeps running while you are logged in.

macOS may ask you to allow it. If you see Allow Merrimo Compute in System Settings ▸ General ▸ Login Items., click Open, find Merrimo Compute in the list and turn it on. The line goes away within about ten seconds.
If you see Merrimo Compute couldn't be turned on. Reinstall Merrimo, then try again., install Merrimo again from a fresh download.
This Mac's own ComfyUI, the one Merrimo starts for you, stops when Merrimo quits. Machines that run ComfyUI on their own, such as another computer on your network, stay available. Keep available covers machines you share with collaborators too. Hold the pointer over the switch to see this in Settings.
While Merrimo Compute runs, the Jobs window and Settings still show the work it does for you.
When you sign out of Merrimo, Merrimo Compute ends its own sign-in and turns itself off within a few seconds, and the machine reads as not reachable. Turn Use AI off, or Keep available off, and it stops too.

What the agent says when no machine is online

If none of your machines is reachable, the agent doesn't draw anything. It tells you: “None of your machines is online to render on.” and points you to Use from anywhere in Settings > Rendering. It can still add a picture it made itself (see above). The agent can also ask which of your machines are online before it tries.

Long renders and the picture in the chat

A render that takes a while (the machine is busy with your own work) isn't lost. The agent tells you it is still rendering, the picture lands in your story by itself, and the agent's next message tells you how it ended.
The agent can't ask the machine to rework a picture from a note like “make it more alien”; it writes the new description itself and renders that. It can't yet animate panels or make poses.
In the chat the picture appears as a small preview. In apps that support it, such as Claude, it opens as a picture panel with Keep (approve this picture as the one to use), Back (go to the previous version) and Refresh. Where the panel isn't supported you get the preview and the agent's words.
If you disconnect an agent in the middle of a render, Merrimo stops waiting for it and the picture is never added to your story. Your machine may still finish the picture it had already started.

See an agent at work

When an agent you connected is working in a story you have open, you can see it, much as you see a teammate.

Its face has a badge. In the toolbar's Share button and in the Here now list, an agent shows its picture, or a sparkles symbol where a person would show initials, with a small sparkles badge on the corner. VoiceOver says “an agent”.
It is named for you. Here now lists it as, for example, “Claude (for Ana)”, where Ana is the person whose account it works for, with where it is: “Reading Chapter 2” or “Editing Chapter 2”. Click it to go there. An agent that sits idle for about five minutes leaves the list, and one you disconnect leaves at once.
You see which paragraph it is on. In the manuscript, a paragraph the agent is working on carries a mark with the agent's name, with a sparkles symbol before it.

An agent that can only read never holds a paragraph.

Locked paragraphs

An agent that can edit takes the paragraphs it is about to change, as a teammate's cursor does, so the two of you don't overwrite each other.

If you are editing a paragraph the agent wants to change, the agent's whole edit is refused and nothing is saved. It is told who is editing which paragraph, and it can try again later or leave that paragraph out.
If the agent has a paragraph and you type in it, a note over the manuscript says that it is editing the paragraph. Click Take Over in the note to take the paragraph for yourself.
An agent lets go of a paragraph as soon as its edit is done, and never holds one for more than a minute.

Ask what changed

Any agent connected to Merrimo, whether in Claude or ChatGPT or in the app, can tell you what changed in a story. Ask it, for example, “What changed in my story today?” or “What did Claude change this week?”. Without a story named, it looks at your twenty most recently edited stories. It answers from the last 24 hours unless you name a time, and can look back up to 90 days.

Changes are grouped: chapters edited or added, pictures, canvas pages, comments and anything else an agent changed.
Each group says who made the changes: “you”, a collaborator by name, or an agent such as “Claude (for Ana)”. You can ask for only your own, only agents', or only people's.
An agent's newest change can take a few seconds to show.

Disconnect an agent

Each agent you connect appears under Connected in Settings, with its name, what it can do and when it last used its access. Click Disconnect beside it. Its access ends right away, and it leaves the list in a moment. To let it back in, connect it again.

If nothing is connected, the list says No agents connected.