Reelpen

io.github.viscountsparrow-cloudv0.1.0Updated Sep 29, 2026

Build editable 3D scenes, direct characters and cameras, and export AI video references with MCP.

VerifiedStreamable HTTPWeb executableMedia & Design AI & ML

Overview

AI-generated overview

Lets an assistant inspect and edit a live Reelpen 3D scene, place characters and cameras, and export reference video or PNG frames.

What it does: Reelpen is a remote MCP server for a browser-based 3D scene builder aimed at AI video previsualization. Through it an assistant can read the current capabilities of an allowed live scene, then arrange characters, props and environments, plan walking or running routes, pauses and supported action sequences, and position cameras with look targets and movement previews. It can also export reference video and PNG frames in supported browser formats, and work with saved projects and film boards under separately granted account permissions.
When to use it: Use it when you want an assistant to help block out a 3D scene, plan a tracking shot or camera motion, storyboard angles, or produce reference video and keyframes for a later AI video workflow. It is a previsualization tool, not a final video generator.
Requirements: A remote MCP endpoint at over Streamable HTTP, with an AI client that supports remote MCP and Reelpen's OAuth discovery and registration flow. Sign-in is via Google OAuth, and the target project must be open in a Reelpen editor tab with live access allowed for that tab. No packages, environment variables or headers are declared.

Before you install

Connecting an account and allowing a live editor tab are separate grants; Stop closes live access but does not revoke separately granted saved-project or film-board access, which must be removed in Connected apps. The assistant can edit the allowed scene, so confirm the reported project and objects match the open editor before changes, and note that scene Undo does not cover every saved account operation. Reelpen is free beta with no card required, but your AI assistant and external…

Installation

In SourceWeft

Open Reelpen in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "reelpen": {
      "type": "http",
      "url": "https://beta.reelpen.ai/mcp"
    }
  }
}

README

Reelpen — 3D scene building for AI video, with MCP

Build an editable 3D scene, direct character and camera movement, then export references for your AI video workflow. Reelpen runs in a desktop browser and offers an authenticated remote MCP connection for compatible AI assistants.

Open Reelpen · Connect your AI · Watch the demo

[Actual Reelpen editor]

What Reelpen does

Arrange characters, props and environments in an editable 3D scene.
Plan walking/running routes, pauses and supported character action sequences.
Position cameras, choose look targets and preview camera movement.
Export reference video and PNG frames using supported browser formats.
Connect a compatible AI assistant to inspect and edit an allowed live scene.
Work with saved projects and film boards through separately granted account permissions.

Reelpen is in free beta; no payment card is required. Your AI assistant and external video-generation services have their own access rules and charges. Check current access information for changes.

Connect through MCP

Setting	Value
Server name	Reelpen
Remote URL	`https://beta.reelpen.ai/mcp`
Transport	Streamable HTTP
Authentication	OAuth; sign in to Reelpen with Google
Live editing	Open the desired project and choose AI: allow in this tab

Use an AI client that supports remote MCP and Reelpen's OAuth discovery and registration flow. Add the remote URL in the client's MCP/connector settings, complete sign-in and review the requested permissions. Then open the desired project in Reelpen using the same account and allow that editor tab.

Start with a read-only check:

Use Reelpen to read my allowed scene. Tell me the project name, the objects and cameras you can see, and whether the scene is live. Do not change anything.

Confirm that the reported project and objects match the open editor before making changes.

Try a small edit:

In my allowed Reelpen scene, keep existing objects. Add one Dolly character with a short walking route and a camera that follows it. Read the current capabilities first, make the change as one batch, then show me a camera preview.

Watch the result and play the entire shot. Wait for Saved before leaving.

Complete connection instructions and troubleshooting

Example prompts · Connection and product FAQ · Smithery tool listing

Workflows

Task	Guide
Build your first moving scene	AI video scene builder
Plan a tracking shot	Camera motion reference
Block characters and compare angles	3D storyboarding
Plan sit, wait, stand and other supported actions	Character motion reference
Choose moving versus still references	Reference video and keyframes

Permissions and limits

Connecting an account and allowing a live editor are separate steps. Stop closes live access; it does not revoke separately granted saved-project or film-board access. Remove the connection in Connected apps to revoke it. Scene Undo covers editor history, not every saved account operation.

AI assistants should read the current capabilities before editing. Builder coverage is evolving; not every Builder control is promised through MCP. Motions are for previsualization. Inspect seat contact, turns, framing and the whole timeline before exporting.

Reelpen prepares references. Final generative video is produced by a separate service, and reference fidelity depends on that service. This repository does not claim that a video model will reproduce a shot exactly.

A local DWG experiment is not a released DWG importer, BIM system or construction-documentation feature.

About this repository

This is Reelpen's public product and connection documentation. It does not contain the application source, private projects, account data or credentials. The hosted connection guide is the current setup reference.

Website · YouTube · X · Help

Product facts reviewed: 2026-09-28.

Source: README.md at commit 0f8ee0d

Tools

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Version history

v0.1.0LatestSep 29, 2026