API & MCP

Everything a person can do on Sketchboard, a program or AI agent can do with the same inputs and get the identical result.

HTTP API

• GET https://sketchboard.usefulweb.app/api/v1/tools – catalog
• GET https://sketchboard.usefulweb.app/api/v1/tools/{id} – inputs, output schema, examples
• POST https://sketchboard.usefulweb.app/api/v1/tools/{id}/calculate – run a tool
• GET https://sketchboard.usefulweb.app/api/v1/workflows · POST https://sketchboard.usefulweb.app/api/v1/workflows/{id}/run
• OpenAPI 3.1: /openapi.json · /openapi.yaml
• Errors: application/problem+json; 422 includes per-field errors.

Tools on Sketchboard

• Sketchboard draw.io to SVG – Convert a draw.io (diagrams.net) or Excalidraw file into a clean SVG and an editable board. sketchboard_drawio_to_svg
• Sketchboard Mermaid to Diagram – Turn a Mermaid flowchart into a laid-out, editable diagram with an SVG export. sketchboard_mermaid_to_diagram
• Sketchboard Auto Layout – Tidy up a diagram automatically: layered flowchart layout or a balanced mind map. sketchboard_auto_layout

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

• Streamable HTTP endpoint: https://sketchboard.usefulweb.app/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
• Tools: sketchboard_drawio_to_svg, sketchboard_mermaid_to_diagram, sketchboard_auto_layout
• Local stdio connector: node src/mcp-stdio.ts

{
  "mcpServers": {
    "usefulweb": { "type": "http", "url": "https://sketchboard.usefulweb.app/mcp" }
  }
}