Modellix Agent Canvas

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Modellix Agent Canvas is a local, workspace-bound stdio MCP plugin for visual AI work. It brings an Excalidraw infinite canvas, Modellix image generation and editing, paid-operation confirmation, durable task recovery, HTML drafts, presentations, and project-local persistence into one workspace.

It supports Codex, Cursor, Claude Code, OpenCode, and other applications that implement local stdio MCP. Hosts with MCP Apps can embed the complete canvas; other compatible hosts use the same MCP server through a short-lived loopback page. Canvas runs locally and does not require a deployed Canvas service.

Product tour

These screenshots come from one real local Canvas session. The reproducible walkthrough uses the original local artwork in docs/images/demo/creative-studio.webp, so you can explore image editing, HTML capture, and presentations without first creating a paid image task.

The single Lumen Creative Direction story below verifies seven connected capabilities instead of showing unrelated examples:

1. Import a real local image as an ordinary canvas asset.
2. Turn the selection into the primary reference for a controlled image edit.
3. Inspect the routed model, effective specification, quantity, and price disclosure before any paid submission.
4. Edit HTML beside a CSP-restricted live preview and capture the rendered result back to Canvas.
5. Reuse the same visual direction in a five-slide presentation.
6. Play the deck in a clean full-screen sequence.
7. Export the page as PNG/SVG, export the deck as a PNG sequence, or back up and restore the project.

A real image workflow

Drop an image onto the canvas or select a completed generation, then describe only the change you want. The selected image becomes the primary reference; output size, count, background, quality, and additional ordered references remain editable before preparation.

Review the route before spending

prepare_modellix_image_task is free. It shows the actual model, routing reason, requested and effective specifications, quantity, and the available price disclosure before a separate confirmation. This documentation run returned an unavailable quote, so no paid submission was made; do not confirm an unquoted task when you have a fixed budget.

Safe HTML drafts

Edit HTML source beside an isolated live preview, capture it back to the canvas, or export the source as a ZIP archive.

Presentation editor

Create editable slide decks from several layouts, drop visual assets into ordinary slide elements, manage the sequence visually, present it, or export a PNG sequence.

Full-screen playback

The same image-led slide plays in the built-in presenter with previous/next controls and a visible slide count.

Export and project backup

Export the current page at 1×, 2×, or 4× PNG, save SVG, download a presentation PNG sequence, or create and restore a project backup.

Reproduce the walkthrough

1. Install the plugin through one host path below, then open it in a real project workspace.
2. Call get_modellix_canvas_status and open_modellix_canvas with the same absolute workspace path.
3. Drop creative-studio.webp onto the canvas, select it, and enter an edit instruction.
4. Choose 16:9 · Landscape, click Prepare edit, and inspect the returned model, route, effective specification, quantity, and price disclosure. Preparation is free.
5. Confirm only when the disclosed total fits your budget. Otherwise choose Back to edit; the walkthrough does not require a paid submission.
6. Open HTML, save the isolated draft, and choose Create screenshot to insert the rendered result back into Canvas.
7. Open Presentation, create a starter deck, and drop the visual into a slide. Use Play or PNG sequence to finish.

What it includes

• Infinite canvas: text, shapes, lines, arrows, freehand drawing, frames, images, grouping, locking, layers, alignment, a project-persisted personal library, and action-level undo and redo.
• Multi-page projects: create, rename, duplicate, reorder, and delete pages while preserving an independent viewport and history for every page.
• Image placeholders: reserve a target area before generation; the selected result replaces the placeholder and remains undoable, while extra results are placed predictably beside it.
• Image generation and editing: text-to-image, single-image editing, ordered 2–10 image references, an explicit primary reference, annotation-based editing, transparent backgrounds, fidelity controls, and 1–4 outputs.
• Model-aware routing: the user states the creative requirement; prepare returns the selected model, routing reason, effective specification, limitations, and estimated total cost.
• Paid-operation safety: prepare is free, submit requires an explicit one-time confirmation, duplicate work is locally deduplicated, and an unknown submission is never retried automatically.
• Durable tasks: task IDs, state transitions, and local results are persisted in an append-only ledger, so work can continue after the host or browser closes.
• HTML drafts: source editing, CSP-restricted sandbox preview, refresh, canvas capture, and source ZIP export.
• Presentations: 16:9, 4:3, and custom ratios; title, content, image, comparison, and blank layouts; thumbnails, reordering, duplication, presentation mode, and PNG-sequence export.
• Import and export: selected area or full-page PNG/SVG at 1×, 2×, or 4×, presentation PNG ZIP, and confirmed project JSON backup restore.
• English, Chinese, and Japanese UI: English is the default. The language switch in the upper-right updates the Canvas, Excalidraw controls, and secure API Key form, and the choice is saved with the project.
• Local security: credentials use the modellix-cli system credential store and are never written to chat, MCP arguments, URLs, project files, or task ledgers.

Requirements

• Node.js ^20.19.0 || >=22.12.0
• Access to the production API at https://api.modellix.ai
• A valid API Key from the Modellix console

Choose one installation path only. Codex, Cursor, and Claude users install once from the host's Git or Marketplace entry; the plugin loads its manifest and Skills and automatically resolves the pinned npm runtime in the background. OpenCode and generic MCP users add the npm-backed MCP once. Users never run a second npm or CLI installation command. The package includes the tested modellix-cli 0.0.8 runtime as an offline fallback. On the first CLI use of each MCP process, Canvas checks the public npm latest tag, atomically caches that exact CLI version in the user-local Modellix cache, and pins it for the rest of the process. A registry or compatibility failure falls back to the bundled version, so a CLI release cannot make the installed Canvas disappear. Set MODELLIX_CLI_AUTO_UPDATE=0 only when a deployment must remain on the bundled fallback. Existing valid CLI credentials are reused; otherwise the first-use prompt only asks for a Modellix API Key.

Optionally run npm exec --yes --package=@modellix/agent-canvas@0.1.17 -- modellix-agent-canvas --doctor from outside the source checkout to verify the published package's Node.js requirement, production dependencies, bundled Widget, and active version. This is a diagnostic, not a second installation path.

Quick start

Install from the host's plugin interface whenever possible.

Agent Plugins 1.0.0 clients

Install this repository or its npm package through any compatible Agent Plugins client. The portable core is the root plugin.json, mcp.json, and skills/ directory. The manifest and MCP configuration target the official 1.0.0 schemas; fixed-location discovery loads the three Agent Skills and the generic stdio server without relying on a host-specific manifest.

Codex

codex plugin marketplace add Modellix/modellix-agent-canvas
codex plugin add modellix-agent-canvas@modellix

The Git marketplace installs the plugin files from this repository. Its Codex adapter starts a single Node bootstrap process, installs the pinned npm runtime into a user-local cache on first use, and then imports the MCP server into that same process. Warm starts reuse the validated cache without retaining an npx wrapper process or requiring a global CLI installation.

Cursor

Run the following command in Cursor:

/add-plugin modellix-agent-canvas

For a GitHub or local-checkout install, open Customize → Plugins → + Add and select the repository root. Cursor reads .cursor-plugin/marketplace.json, then offers Modellix Agent Canvas from the modellix personal marketplace. This is separate from the Open Plugins metadata submitted to Cursor Directory.

Claude Code

claude plugin marketplace add Modellix/modellix-agent-canvas
claude plugin install modellix-agent-canvas@modellix

After enabling or upgrading the plugin, run /reload-plugins, then use /mcp to verify the connection.

OpenCode and other MCP hosts