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Steel Brain MCP server

online · 100% uptime
by dryow1·io.github.dryow1/steel-brain·v1.1.0
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Trade-verified steel grade properties, substitution verdicts, and mill-cert guidance for AI agents.

A87/100grade A
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Safety scan
A87/100

full report

Adoption
Growing

0 stars

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If you have run it, two minutes of your experience saves the next person an afternoon.

Steel Brain tools (3)

write = sends, deletes, buys or posts
  • cert_guideFree

    Which mill cert type applies for a grade + use case (e.g. EH36 shipbuilding), and what fields to check on the cert.

  • grade_lookupFree

    Look up a steel grade: properties, chemistry, forms, applications, weldability. Aliases accepted (e.g. 4140 = 42CrMo4 = SCM440).

  • substitution_checkFree

    Check if one steel grade can substitute another for a given application (machined / welded-structural / pressure). Returns verdict + reasoning from verified trade rules.

Public scan report

scanner v0.1.10 · 2026-10-03 · same rubric, same numbers if you re-run it

no findings
  • –Code scanpackage could not be scannedn/a
  • Live reliabilityremote reachable in 2763ms17/20
  • Tool poisoning3 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 5 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 87/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Steel Brain compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
87/100
higher than 73% of 48,255 servers
Tools
3
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
592 ms
faster than 24% of 30,031 servers

What its tools let an agent do: 3 read

Release history: 2 versions in the registry since 2026-09-16, latest 2026-09-25, typically one every 9 days.

Install Steel Brain in Claude Code, Cursor or VS Code

claude mcp add --transport http steel-brain https://api.steelbrain.dev/mcp
Add to Cursor

What the publisher says

From the Steel Brain repository's README, as published. We do not edit it. Read it on GitHub

Steel Brain

An MCP server providing steel domain knowledge to AI agents — grade properties, substitution verdicts, and mill-cert guidance, delivered as MCP tools your agent can call.

Also available as a REST API at https://api.steelbrain.dev.

MCP server

Steel Brain is a Model Context Protocol server. It exposes three MCP tools over stdio transport:

Running the MCP server

pip install -r requirements.txt python -m steelbrain.mcpserver

Starts the MCP server on stdio transport, ready for any MCP client (Claude Desktop, Claude Code, or any MCP-compatible agent).

Example MCP client config

{ "mcpServers": { "steel-brain": { "command": "python", "args": ["-m", "steelbrain.mcpserver"] } } }

Built with the official MCP SDK (mcp package), registering three tools via the standard MCP tool interface.

Why Steel Brain

LLMs guess at steel. They will tell you 4140 annealed can stand in for 4140 pre-hardened, and scrap the job. Steel Brain answers from a human-verified knowledge base built by a working steel trader, and returns an honest "not in knowledge base" rather than a confident guess.

The valuable part is the substitution and cert logic:

  • 4140RB to 4140QT (annealed vs pre-hardened): invalid, same alloy, opposite heat-treat
  • 316L to 304L for marine: invalid, different corrosion class
  • EH36 to S355 structural: valid one way, conditional the other
  • Seamless vs ERW for pressure service: never interchangeable

Coverage

23 grades across carbon, alloy, stainless. Round bar, hollow bar, plate, pipe. 39 substitution rules, 4 cert guides.

REST API (alternative to MCP)

Same knowledge over REST at https://api.steelbrain.dev :

curl "https://api.steelbrain.dev/v1/grade/4140QT" -H "X-API-Key: YOURKEY" curl "https://api.steelbrain.dev/v1/substitution?fromgrade=316L&tograde=304L&application=machined" -H "X-API-Key: YOURKEY"

Free tier at launch. Contact: dryow.jt@gmail.com

Honesty by design

  • Grade properties: published-standard ranges (ASTM/EN/JIS/API/ABS), labelled as such.
  • Substitution + cert logic: trade-verified, dated rulings from a working trader.
  • Unknown grades: honest "not in knowledge base," never fabricated.

Development

python -m pytest tests/ # 15 tests (10 acceptance + 5 domain-safety guards)

License

Code: MIT (see LICENSE). Knowledge base (kb/): proprietary (see NOTICE).

Nothing above is checked by us. What we check is on the safety report.

Steel Brain: common questions

Is Steel Brain MCP server safe?
Yes, by our scan: it is graded A (87/100). Read the Steel Brain safety report
How do I install Steel Brain?
It runs remotely at api.steelbrain.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Steel Brain need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Steel Brain maintained?
The last commit was 37 days ago (2026-09-28). The latest release is v1.1.0.
Is Steel Brain up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Steel Brain compare with other MCP servers?
safety score 87/100 (higher than 73% of 48,255 servers); tools 3 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.