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Steel Brain MCP Server

answering

Steel Brain is answering right now. Last checked 8 min ago. It exposes 3 tools. Last commit 28 Sep 2026.

Trade-verified steel grade properties, substitution verdicts, and mill-cert guidance for AI agents.

Uptime history 44 days of history · worst day 99%
44 days agonow
100.0%
Uptime 24h
91 of 91 checks
3
Tools
read from the server
597 ms
Response time
average over 24h
0
Stars
last commit 28 Sep 2026

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 28 September 2026. No other catalogue keeps this.

28 Sep a tool changed version

Nothing serious here today

Today is the operative word: we check Steel Brain every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

run in your terminal
claude mcp add steel-brain --transport http https://api.steelbrain.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
https://api.steelbrain.dev/mcp
~/.codex/config.toml
[mcp_servers.steel-brain]
url = "https://api.steelbrain.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "steel-brain": {
      "url": "https://api.steelbrain.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "steel-brain": {
      "type": "http",
      "url": "https://api.steelbrain.dev/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

cert
cert_guide
Which mill cert type applies for a grade + use case (e.g. EH36 shipbuilding), and what fields to check on the cert.
grade
grade_lookup
Look up a steel grade: properties, chemistry, forms, applications, weldability. Aliases accepted (e.g. 4140 = 42CrMo4 = SCM440).
substitution
substitution_check
Check if one steel grade can substitute another for a given application (machined / welded-structural / pressure). Returns verdict + reasoning from verified trade rules.

Endpoints

URLTransportStateLatencyChecked
https://api.steelbrain.dev/mcp streamable-http answering 561 ms 8 min ago

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Steel Brain — questions

Answers built from our own checks of this server.

What can Steel Brain do?
It exposes 3 tools, read directly from the server on our last check. Among them: cert_guide, grade_lookup, substitution_check. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Steel Brain working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 597 ms. The bar chart above shows every period we have measured.
How do I connect Steel Brain?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Steel Brain need an API key?
No. Steel Brain completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Steel Brain?
It answers our handshake in 597 ms on average, which is faster than 18% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Steel Brain open source?
The code is open source: it is published under the MIT licence, written in Python, 0 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at api.steelbrain.dev, which runs on its operator's own terms.