API & MCP

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

HTTP API

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

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://apps.usefulweb.site/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
• Tools: kerfwise_cabinet_builder, kerfwise_cut_list, kerfwise_sheet_nesting, kinetica_collision_check, kinetica_forward_kinematics, kinetica_inverse_kinematics, kinetica_trajectory_planner, ohmforge_ac_sweep, ohmforge_dc_operating_point, ohmforge_led_resistor, ohmforge_transient, threadsmith_design_stats, threadsmith_digitize, threadsmith_stitch_file, twinworks_bottleneck_analysis, twinworks_buffer_sweep, twinworks_simulate, twinworks_line_balance, twinworks_queue_formulas
• Local stdio connector: node src/mcp-stdio.ts

{
  "mcpServers": {
    "usefulweb": { "type": "http", "url": "https://apps.usefulweb.site/mcp" }
  }
}