Developer Tools

Your AI now knows the welding code.

Connect Claude, ChatGPT, or Cursor to verified AWS D1.1 data — every answer cites the exact table and clause. 34 tools covering preheat, heat input, carbon equivalent, fillet weld sizing, NDE requirements, and cross-standard material lookup. Free, open, no API key required.

BeforeWhat preheat do I need for A572-50?

"Typically 50-200F depending on thickness..."

AfterWhat preheat do I need for A572-50?

"50F (10C) per D1.1:2025 Table 5.11, Category B, GMAW at 1.5 inches."

Quick Start

Connect in 2 minutes

Option A — Connectors (recommended)

Open Claude Desktop (Pro, Max, Team, or Enterprise)
Go to Settings → Connectors
Click "Add custom connector"
Paste URL: https://mcp.clause5.io/mcp
The 24 welding tools appear automatically

Option B — JSON config (via bridge)

Open Settings → Developer → Edit Config

Paste:

{
  "mcpServers": {
    "clause5": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.clause5.io/mcp"]
    }
  }
}

Restart Claude Desktop

Claude Code: claude mcp add --transport http clause5 https://mcp.clause5.io/mcp

Requires ChatGPT Pro, Team, or Enterprise with Developer Mode enabled

Go to Settings → Developer Mode → Enable
Go to Settings → Connectors → Create
Enter URL: https://mcp.clause5.io/mcp
The 24 tools appear in your tool list
Ask any welding compliance question — ChatGPT calls the tools automatically

Open Settings → MCP Servers
Add server with URL: https://mcp.clause5.io/mcp

Add to Cursor

For Developers

34 tools, each returning structured data with source citations

preheat_lookup — D1.1:2025 Table 5.11 preheat/interpass temperature
d12_aluminum_lookup — D1.2 aluminum preheat
d13_sheet_steel_lookup — D1.3 sheet steel
d14_preheat_lookup — D1.4:2018 reinforcing steel preheat
d15_preheat_lookup — D1.5:2025 bridge steel preheat (NFC + FC)
d16_stainless_lookup — D1.6:2017 stainless steel interpass + filler
d18_seismic_lookup — D1.8 seismic supplement
d19_titanium_lookup — D1.9 titanium
w59_preheat_lookup — CSA W59:2018 Canadian structural preheat
as_nzs_1554_preheat — AS/NZS 1554.1 Australian preheat
en1011_preheat_calc — EN 1011-2 CET preheat formula
iso15614_qualification_range — ISO 15614-1 qualification ranges
asme_ix_p_number_lookup — ASME IX P-number grouping
asme_ix_f_number_lookup — ASME IX F-number grouping
cwi_eligibility_check — AWS B5.1 CWI eligibility matrix
a51_smaw_electrode_lookup — AWS A5.1 SMAW electrode specs
a518_gmaw_electrode_lookup — AWS A5.18 GMAW/GTAW wire specs
a520_fcaw_electrode_lookup — AWS A5.20 FCAW electrode specs
a52_oxyfuel_rod_lookup — AWS A5.2 oxyfuel rods
a55_lowalloy_smaw_lookup — AWS A5.5 low-alloy SMAW
a59_stainless_electrode_lookup — AWS A5.9 stainless electrodes
a528_lowalloy_gmaw_lookup — AWS A5.28 low-alloy GMAW
a536_fcaw_mcaw_lookup — AWS A5.36 FCAW/MCAW unified
api1104_pipeline_lookup — API 1104 pipeline welding
heat_input_calc — Heat input formula (V x A x 60 / S x 1000)
carbon_equivalent — IIW CE + Pcm with zone classification
fillet_weld_size — D1.1:2025 Table 7.7 minimum fillet size
deposition_rate — GMAW/FCAW deposition rate (lbs/hr, kg/hr)
nde_requirements — D1.1:2025 Clause 8 NDE method requirements
machine_check — Consumable specs by wire/diameter/brand
cross_standard_lookup — Steel equivalence across ASTM/CSA/EN/AS
list_standards — List all encoded welding standards
compliance_chain — Suggest next compliance step
compare_standards — Side-by-side preheat across standards

Quick Test

curl -X POST https://mcp.clause5.io/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Free, no API key. Every response includes the exact table reference and clause number.

FAQ

What is the Clause5 MCP server?

A free, open Model Context Protocol server that gives AI assistants like Claude, ChatGPT, and Cursor access to verified welding compliance data from 24 standards including AWS D1.1 through D1.9, CSA W59, ASME IX, API 1104, and 8 AWS A5.x filler metal specs. Every answer includes the exact table reference and clause number.

Do I need an API key?

No. The server is free and requires no authentication. Connect any MCP-compatible AI client to the endpoint and start querying.

What standards are covered?

24 welding standards: AWS D1.1 through D1.9, CSA W59, AS/NZS 1554, EN 1011-2, ISO 15614-1, ASME IX (P and F numbers), AWS B5.1 (CWI), AWS A5.1/A5.2/A5.5/A5.9/A5.18/A5.20/A5.28/A5.36 (filler metals), and API 1104 (pipelines).

34 verified tools from 24 welding standards — Clause5