ArchLang

What you can ask

• Design a two-bedroom flat of about 75 m² as an ArchLang plan and check it against the brief.Copy

  Example path describe · Archlang brief to plan skill

• Make the bedroom in plan.arch 1 m wider and show me what changed.
• Put plan.arch on an A3 sheet and give me a link to download it as a PDF.

MCP connector

Server URL

https://mcp.archlang.uk/mcpCopy

Login

None

Protocol

MCP 2025-11-25

Instructions

ArchLang compiles .arch text to SVG floor plans. Before writing any .arch, read the archlang://spec resource: the whole language (from a shell: npx -y @chanmeng666/archlang spec). The loop:

Write the plan as .arch source.

compile it. Errors are diagnostics, usually with a byte span, often a fix; fix applies the machine-applicable ones, edit the rest by hand.

describe it; check rooms, areas and doors against the brief.

validate with strict:true (parse, resolve, lint); fix every warning, then back to 2.

finish once lint is clean, before export: it furnishes empty rectangular rooms on every storey and adds the missing sheet statements (paper, scale, dimensions, title, room schedule, legend). With a shell, the CLI runs the same loop at no context cost: archlang <cmd>, or npx -y @chanmeng666/archlang <cmd> without a global install.

Tools

Skills

5 in the ChatGPT listing

• archlangUse when the user wants to create, edit, or inspect an architectural floor plan / building layout as code — e.g.
• Archlang brief to planUse when the user gives a written brief for a new floor plan (rooms, areas, how rooms connect, a plot size) and wants the drawing, e.g.
• Archlang edit planUse when the user wants to change an existing ArchLang .arch floor plan, e.g.
• Archlang exportUse when the user wants an ArchLang .arch floor plan delivered as files, e.g.
• Archlang review planUse when the user wants an existing ArchLang .arch floor plan checked rather than changed, e.g.