MCP server ArchScript

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ArchScript is an architecture-as-code tool. You describe a system — domains, services, databases, queues, and deployments as cluster → server → Docker container — in a small language. ArchScript draws the diagram, checks the model against architecture rules and exports documentation, a PDF report, Mermaid, PlantUML and Terraform.

ArchScript for Mac includes an MCP server. Claude Desktop, Claude Code and other MCP clients can read the architectures you have open, change them with precise, structured edits, validate them and look at the rendered diagram. Every change appears live in the window and can be undone.

This repository contains the documentation, configuration examples, example models and a small open-source stdio bridge (server/) for the ArchScript MCP server. ArchScript itself is a closed-source app, available on the Mac App Store. The browser Playground is free.

What Claude can do

Tool	What it does
archscript_guide	Learns the language, element types and rules
list_documents	Lists the open documents (id, name, validity)
get_document	Reads a document with line numbers and a structure outline
create_document	Creates a new architecture from ArchScript source
set_document_source	Replaces a document's source
edit_document	Structured edits: add, rename, move and delete elements, relations and containers, and set properties, tags and colours
validate	Returns diagnostics
review	Returns the review score, grade and rule findings
render_diagram	Returns the diagram as an image, so the assistant can see the result
export	Exports Mermaid, PlantUML, Markdown, JSON or Terraform

The assistant doesn't rewrite your file. It sends small operations (for example add_element into cluster:Production/server:app-01/container:api). The ArchScript core turns those into minimal text edits, so comments and formatting stay intact. After each change the assistant gets the validation result and review score back, the same feedback loop a human architect uses.

Example prompts

• "Read my architecture and tell me which rules it violates."
• "Add a background worker that sends order emails. Put it in its own container on app-01 and connect the Order API to it."
• "Create an event-driven architecture for a ticket shop with a payment provider and a read model."
• "Export the current model as Terraform for AWS and list what wasn't mapped."

Setup

Requirements: ArchScript for Mac (macOS 14+) with ArchScript Pro (14-day free trial).

1. Open ArchScript → Settings → AI and turn on Allow AI assistants (MCP).
2. Copy the snippet for your client from that screen. It already contains your personal access token.

Claude Desktop: one-click install (recommended)

1. Download archscript.mcpb from the latest release.
2. Double-click it, or drag it into Claude Desktop → Settings → Extensions.
3. Paste the access token from ArchScript → Settings → AI.

The extension contains no ArchScript code. It holds a manifest and a small launcher script (mcpb/server/archscript-mcp) that finds ArchScript for Mac and starts its bundled helper.

Claude Code

claude mcp add --transport http archscript http://127.0.0.1:47621/mcp \
  --header "Authorization: Bearer <token from Settings → AI>"

Claude Desktop (manual)

Add the snippet to claude_desktop_config.json, then restart Claude:

{
  "mcpServers": {
    "archscript": {
      "command": "/Applications/ArchScript.app/Contents/MacOS/archscript-mcp",
      "args": ["--token", "<token from Settings → AI>", "--port", "47621"]
    }
  }
}

The bundled archscript-mcp helper bridges stdio to the app and starts ArchScript when Claude needs it.

Other MCP clients

Any client that supports Streamable HTTP can connect to http://127.0.0.1:47621/mcp with the header Authorization: Bearer <token>. Clients that only support stdio can use the helper as shown above, or the open-source Node bridge in server/ (Node 18+, no dependencies):

{
  "mcpServers": {
    "archscript": {
      "command": "node",
      "args": ["/path/to/archscript-mcp/server/index.js"],
      "env": { "ARCHSCRIPT_TOKEN": "<token from Settings → AI>" }
    }
  }
}

Privacy and security

• Local only. The server listens on 127.0.0.1 and is never reachable from the network.
• Token required. Every request needs your access token. You can regenerate it at any time in Settings → AI.
• Off by default. Nothing runs until you turn it on.
• No telemetry. ArchScript collects no data and sends nothing anywhere. Your AI client only sees what it reads through the tools.
• The helper is sandboxed and only forwards stdio to the local server.

Screenshots

Visual editing	Review and rules
Inspector	Element library

A Docker deployment as code: cluster → servers → containers → services.

Example models

The examples/ folder contains ready-to-use architectures. Open one in ArchScript for Mac, or paste it into the Playground:

File	Architecture
basic.archs	The smallest useful model
customer-management.archs	One domain with web app, API and database
webapp.archs	Classic web application with boundaries
microservices.archs	Services with their own databases and an event bus
ddd.archs	Bounded contexts (domain-driven design)
event.archs	Event-driven, CQRS-style flow
saas.archs	Production SaaS with gateway and identity provider
docker.archs	Docker Swarm cluster, servers and containers

A taste of the language:

project DockerShop

cluster Production {
  platform "Docker Swarm"

  server "app-01" {
    container api {
      image "shop/api:1.4"
      element service "Order API" as orders { tech "Rust"; owner "Orders Team" }
    }
  }
}

element frontend "Web Shop" as shop
relation shop -> orders : HTTPS

The full language reference is at archscript.dev/docs.

Feedback

Found a bug in the MCP integration or have an idea for a tool? Please open an issue. Feature requests for ArchScript itself are welcome too.

License

The documentation, configuration snippets, example models and the bridge in server/ are available under the MIT License. ArchScript for Mac and the ArchScript core are proprietary software.