Engineering MCP Server

Deterministic, standards-compliant engineering calculations exposed as Model Context Protocol tools. Free public access — rate-limited. Read the guide.

Endpoint

http://fast.engineer/mcp · Streamable HTTP, stateless — MCP 2026-07-28 and 2025-11-25 clients

Quick start

Anonymous (no signup, ~20 calls/hour, IP-rate-limited):

curl -X POST http://fast.engineer/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","method":"tools/list","id":1}'

Free tier (email signup, 500 calls/day) — fill in the form below to have a key emailed to you.

Get a free key

Tools

Every engineering result carries its governing constraint, the checks behind it, the clause/table references it relied on, its assumptions and SHA-256 hashes, so it can be reproduced.

Conductor size equivalence (AWG / kcmil / mm²) fe_util_conductor_size IEC 60228ASTM B258

Unit conversion fe_util_convert

Per-unit and impedance base conversions fe_util_per_unit

Standards index fe_ref_standards

Validation scorecard fe_ref_validation

Client config snippets

Claude Code:

claude mcp add --transport http fast-engineer http://fast.engineer/mcp

Claude, ChatGPT and other connector UIs: add a custom connector with the URL http://fast.engineer/mcp.

Cursor / VS Code / Cline (mcp.json):

{
  "mcpServers": {
    "fast-engineer": {
      "url": "http://fast.engineer/mcp",
      "headers": { "Authorization": "Bearer YOUR_KEY_HERE" }
    }
  }
}

Anonymous tier? Omit the headers block.

Claude Desktop and other clients that only launch local servers: install the Python package, store your key once, and point the client at the command.

python -m pip install fast-engineer-mcp
fast-engineer-mcp login        # paste the emailed key; stored for your user only
fast-engineer-mcp check        # lists the tools you can call

{
  "mcpServers": {
    "fast-engineer": { "command": "fast-engineer-mcp" }
  }
}

The package forwards every call here; nothing is calculated locally. Source and issues: github.com/fast-engineer/fast-engineer-mcp.

Signed-in workspace

http://fast.engineer/mcp/workspace · OAuth sign-in with your fast.engineer account; your client opens the sign-in page the first time it connects, and you choose which team workspace it may use.

Adds to the free tools:

Your calculations — save results to your calculation library, list and reopen them.
Power-system networks — your PSAS networks: edit, load flow, fault, contingency and coordination studies.
Team projects — a revisioned network model per project: load-list import, maximum demand, fault levels, cable sizing, protection checks, QA, cable schedule (xlsx/csv) and a calculation report (PDF).
Drawings (preview) — digitize PDF, CAD and scanned drawings into symbols, wiring, a title block and an editable block diagram; list and create symbol blocks; build, edit and export block diagrams (DWG/DXF/PDF/SVG/PNG).
Prompts — Size all cables from a load list, Check one cable, Fault level at a board, Digitize a drawing, Draw a block diagram.
Interactive views in clients that support MCP Apps — a cable schedule you can resize and re-check, and a column mapper for load-list imports.

claude mcp add --transport http fast-engineer-workspace http://fast.engineer/mcp/workspace

Connector UIs: add a custom connector with the workspace URL; no key is needed. Revoke a client any time from Connected apps.