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Trade-verified steel grade properties, substitution verdicts, and mill-cert guidance for AI agents.
About
Trade-verified steel grade properties, substitution verdicts, and mill-cert guidance for AI agents.
Security Report
Steel Brain is a well-architected MCP server providing steel domain knowledge with proper authentication, rate limiting, and metering. The codebase demonstrates strong security hygiene: API keys are generated securely, stored in SQLite with proper threading, and verified on every request. The knowledge base has verification controls to prevent serving unverified data in production. No malicious patterns, credential leaks, or dangerous operations detected. Minor code quality observations exist but do not impact security posture. Supply chain analysis found 6 known vulnerabilities in dependencies (0 critical, 5 high severity).
7 files analyzed · 11 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
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This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-dryow1-steel-brain": {
"args": [
"-y",
"github:dryow1/steel-brain"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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:
| MCP Tool | What it does |
|---|---|
grade_lookup | Properties, chemistry, forms, applications, weldability for a steel grade. Aliases resolved (4140 = 42CrMo4 = SCM440; S355 = ST52). |
substitution_check | Given from_grade, to_grade, application, returns a verdict (valid / conditional / invalid) with reasoning on whether one grade can substitute another. |
cert_guide | Which mill certificate applies for a grade + use case (EN 10204 3.1/3.2, class certs ABS/DNV/LR/BV/NK) and what to check. |
Running the MCP server
pip install -r requirements.txt
python -m steel_brain.mcp_server
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", "steel_brain.mcp_server"]
}
}
}
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: YOUR_KEY"
curl "https://api.steelbrain.dev/v1/substitution?from_grade=316L&to_grade=304L&application=machined" -H "X-API-Key: YOUR_KEY"
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).
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